Auto Electrical Repair & Diagnostics Miami — Since 1957

Car won't start, dead batteries that drain overnight, multiple warning lights at once, intermittent electrical accessories, network communication faults, hybrid system shutdowns. We diagnose the actual fault — not replace parts hoping it works.

Diagnostic priced at one hour of our hourly rate for your vehicle (typically $165–$245) · Applies toward repair · ASE Master Certified · ASE L3 Hybrid/EV Specialist · Manufacturer-level diagnostic platforms · 2-year / 24,000-mile warranty

[ASE Master] · [ASE L3 Hybrid/EV] · [AAA Approved] · [NAPA AutoCare]

Modern vehicles aren't cars with electrical systems — they're electrical systems with cars wrapped around them. A 2018 Land Rover Range Rover has more than 70 interconnected control modules. A current-generation Jeep Wrangler 4xe runs five separate communication networks simultaneously. A Volvo XC90 Recharge integrates high-voltage hybrid management with low-voltage body electronics across the Central Electronic Module. When something fails on a vehicle this complex, replacing the most visible part rarely fixes the underlying fault — and often makes the diagnostic harder for whoever fixes it next.

Green's Garage has been Miami's diagnostic-first independent electrical shop since 1957 — three generations of family ownership, ASE Master Certified, ASE L3 Hybrid/EV Specialist certified, running manufacturer-level diagnostic platforms (PATHFINDER, wiTECH 2, HDS, Subaru Select Monitor SSM-IV, VIDA, Mazda's factory platform, Toyota Techstream) for the brands where we maintain specialty capability. We test systems before we replace parts. We isolate circuits before we condemn modules. We write our findings down before we quote a repair. You see what we found, and you decide what to authorize — even if that's not us. Same-week appointments. 2-year / 24,000-mile warranty on any electrical repair we perform. Call (305) 444-8881.

Jump to: Car won't start · Battery drain & parasitic draw · Multiple warning lights · CAN bus & network faults · A/C electrical · Intermittent accessories · Hybrid & EV electrical · Brand specialty depth · Pricing · FAQ

You're in the right place if you're dealing with:

• A car that won't start — turns over but doesn't fire, doesn't crank at all, or starts intermittently for no apparent reason
• A battery that dies overnight — replaced more than once, still draining, dealer or another shop couldn't find the parasitic source
• Three or four warning lights on at once — Check Engine plus ABS plus Traction Control plus Airbag, lit simultaneously after a single trigger event
• A "U-code" or "no communication" fault on a scan tool — module not responding, network communication interrupted, intermittent module dropout
• Power windows, lighting, HVAC controls, or other accessories that work intermittently, reset on their own, or fail in patterns the previous shop couldn't reproduce
• A hybrid or EV system disabled — high-voltage warning, "service hybrid system," reduced power mode, or won't engage drive
• A charging system warning — alternator replaced but the warning came back, voltage gauge reading low, battery charge unstable
• An ABS, traction control, or stability system fault that comes and goes — wheel speed sensor, module communication, or wiring issue
• An estimate from the dealer for a complex electrical repair ($2,000+) that you want a second opinion on before authorizing
• An immobilizer or key fob fault — won't unlock, won't start, key not recognized, security system locked out
• Post-collision electrical issues — accidents that damaged wiring, modules, or sensors that the body shop didn't fully resolve

If any of this describes your situation, call (305) 444-8881 or schedule a diagnostic online.

How We Diagnose Electrical Problems — The Methodology

Most shops handle electrical problems the same way: read the scan tool, look up the most common cause for that code, replace the part associated with the code, and send the customer home. That works on simple low-voltage faults. It fails on everything else. Modern automotive electrical systems are interconnected webs where a single fault can produce symptoms in five places at once — and the fault location is rarely where the symptom appears.

We do it differently.

1. Symptom interview first. Before we plug anything in, we ask the driver to describe exactly when the problem happens. Cold start or hot start? After fueling? After parking in direct sun? Only when the AC is on? Only after a few days of sitting? After driving in rain? Half of electrical misdiagnoses happen because nobody asked the driver the right environmental questions. We ask them.

2. Manufacturer-level scan, not generic OBD-II. We connect using the platform built for your vehicle. A generic OBD-II reader pulls about 5% of what your vehicle's electrical system actually knows. The other 95% — module communication history, network bus voltage logs, sleep-state wake events, immobilizer transactions, individual module power-up sequences — that's where the diagnosis actually lives.

3. Targeted physical testing. Scan data points us toward a system. We confirm with the right physical test. Battery and charging analysis under load (not just at rest). Voltage drop testing on suspect circuits. Parasitic current draw with an amp clamp at the battery terminal during sleep-state cycles. Oscilloscope waveform analysis on CAN bus signals to see network communication in real time. Power and ground integrity verification at the module level. We don't replace parts to "see if it fixes it." That's how cars come back with the same symptom three weeks later.

4. Isolate the circuit before condemning the module. A common pattern across all manufacturers: a control module gets replaced for a fault that's actually a wiring problem upstream. We verify power supply integrity, ground integrity, and network communication integrity to a suspect module before declaring it faulty. New modules are expensive — sometimes $800-$3,500. Replacing the wrong one is the single most expensive electrical mistake.

5. Written findings before authorization. You get the diagnosis in writing, with our recommended repair, the cost, and — when relevant — lower-cost vs OEM parts options. You decide what to authorize. If you want the repair done at Green's, we do it. If you want to take our findings to another shop, that's fine. If you want a third opinion, we'll point you toward a specialist.

The diagnostic fee is one hour of our hourly labor rate for your vehicle — typically $165 for mainstream platforms, up to $245 for luxury and complex multi-module work. If you authorize repairs at Green's, the diagnostic fee applies toward the repair bill.

Car Won't Start — Diagnosis & Repair Miami

"Car won't start" is shorthand for at least five distinct electrical failure patterns, and they require different diagnostic paths. Replacing the battery, the starter, or the ignition switch as a first move — without confirming which actual failure pattern you're dealing with — is how customers end up replacing three components and still have a no-start condition.

The five no-start patterns we diagnose:

Dead silence when you turn the key — no click, no crank, dashboard lights may or may not work. Usually a dead battery, but could also be a battery cable connection failure, a fusible link failure, an ignition switch fault, or in some platforms an immobilizer system that's locked the starter circuit. We test each in sequence — battery state, terminal voltage drop, starter solenoid command signal, immobilizer transaction.

Clicks but doesn't crank — that fast clicking sound with the key turned. Almost always a battery or cable issue (insufficient current to engage the starter solenoid), occasionally a failing starter solenoid that needs more current than the battery can deliver. Load testing the battery confirms which.

Cranks but doesn't fire — engine turns over but won't catch. Could be fuel (no fuel pressure, no injector pulse), spark (no ignition coil command, no crank position sensor signal), or compression (less common as a sudden failure). Scan data plus fuel pressure plus ignition signal testing identifies which.

Intermittent no-start — starts fine most of the time, fails to start randomly, then starts again on the next attempt. The hardest no-start pattern to diagnose because it usually isn't failing when the car is at the shop. We capture freeze-frame data from the moments when the failure occurred (recent power-up history is stored in most modern modules), then look for patterns in environmental conditions, fuel level, parking position, time-since-last-start. The Jeep TIPM failure pattern on 2007-2014 Wrangler, Grand Cherokee, and Ram trucks is exactly this kind of intermittent no-start; we see it frequently.

Hot-start failure only — starts fine cold, fails to start when hot, starts again after sitting and cooling down. Almost always a fuel pump driver module, crank position sensor that fails at temperature, or in some cases a specific platform's known starter solenoid heat-soak issue. Pattern-recognized by vehicle and confirmed by component testing.

For deeper detail on no-start diagnosis specifically, see our Crank No-Start Diagnostics in Miami → sub-page.

Battery Drain & Parasitic Draw Diagnosis Miami

Replacing the battery doesn't solve a parasitic draw — it just resets the clock on how long until the new battery is also drained. The actual diagnostic question is: what's consuming current while the car is supposed to be asleep?

Normal modern vehicle parasitic draw is around 25-50 milliamps while modules are in sleep state. Higher than that means something isn't sleeping when it should be. Common excessive-draw sources we diagnose:

A control module that won't enter sleep state — most modules wake on activity (door open, key insert, remote unlock), do their work, then return to sleep. A module with a software fault or stuck wake-state can stay awake indefinitely, drawing 0.5 to 2 amps continuously. The battery is dead within 24-48 hours.

A failing alternator with diode leak — the alternator's internal diodes prevent backflow from battery to alternator when the engine is off. Failed diodes let current flow backward, slowly draining the battery. Symptom is usually subtle — a gradually weakening battery that dies after a long weekend rather than overnight.

Aftermarket accessories wired incorrectly — alarm systems, GPS trackers, dashcams, audio equipment, lighting. Hardwired accessories drawing current bypass the OEM sleep-state management and can drain the battery while the car sits.

A trunk or interior light that doesn't turn off — sounds simple, often overlooked. Light stays on for hours, battery dies. Common on aging vehicles with worn door pin switches.

A short-to-ground in a wiring harness — chafed wiring contacting body ground, sometimes intermittent depending on temperature, vibration, or harness flex. The hardest parasitic draw to diagnose because the circuit may test fine at rest and only fault under specific conditions.

Our parasitic draw process:

We start with a baseline current draw measurement at the battery — key-off, doors closed, locked, after the full sleep-state timeout (usually 30-45 minutes for modern vehicles). Then we systematically remove fuses one at a time from the main fuse panel, watching for a current drop. When pulling a specific fuse drops the draw to normal, we've isolated the circuit. From there we trace the circuit to identify which load on that circuit is the source — module, accessory, wiring fault.

For European luxury and network-heavy vehicles where module sleep-state issues are most common, we add wake-cycle monitoring — watching which modules wake unexpectedly and what triggers them. Volvo's CEM (Central Electronic Module) and Land Rover's body control module are particularly common sources of parasitic draw issues, and our diagnostic platforms read their wake event history directly.

Multiple Warning Lights On Simultaneously

When three or four warning lights illuminate at once — Check Engine, ABS, Traction Control, Airbag, Stability Control — the cause is rarely three or four unrelated failures. The cause is almost always a single underlying issue affecting multiple modules at the same time.

Three common single-cause patterns that light up multiple warnings:

Voltage instability across the network. A failing alternator that produces unstable voltage, a weak battery, or a loose battery cable connection causes voltage to fluctuate at all modules simultaneously. Modules that detect their input voltage is out of spec set fault codes — and if multiple modules detect it at the same time, multiple warning lights illuminate. Fix the voltage source, the lights go off.

A network communication interruption. Modern vehicles communicate over CAN bus networks. If one module loses communication, other modules that expect to hear from it set fault codes too. A single failed module can cascade fault codes across 5-10 other modules, lighting up multiple warning lights from one root cause.

A single sensor that multiple modules use. Wheel speed sensors are shared between ABS, traction control, stability control, and the speedometer. A failed wheel speed sensor lights up four warning indicators at once. Similarly, the brake pedal position sensor is shared between brake systems, transmission, and engine; one failure cascades.

We don't quote you four separate repairs for four warning lights. We diagnose the single underlying cause — voltage, communication, or shared sensor — and quote the actual fix.

CAN Bus & Network Communication Diagnosis

CAN (Controller Area Network) is the wiring backbone that lets modules talk to each other

Modern vehicles have multiple CAN networks — high-speed for powertrain, medium-speed for body, separate networks for infotainment, hybrid systems, and advanced safety systems. Network communication faults are increasingly the root cause of seemingly-unrelated symptoms as vehicles get more electronically complex.

Common CAN bus fault patterns:

U-codes on a scan tool — fault codes starting with U (e.g., U0100, U0140, U0151) indicate module communication failures. The code tells you which communication path failed; it doesn't tell you why.

Module dropout — a module that randomly stops responding to the scan tool, then comes back on its own. Could be the module itself, could be its power/ground supply, could be a wiring fault at the CAN bus connection, could be terminating resistance integrity on the bus.

Bus voltage imbalance — CAN bus signals run on differential voltage between CAN-high and CAN-low wires. The two wires should swing in opposite directions in mirror image. If one wire has higher resistance to body ground than the other, the signals get distorted — modules can't read them reliably and intermittent communication faults result.

Network short-to-voltage or short-to-ground — a single CAN bus wire making unintended contact with battery voltage or chassis ground brings the entire network down. All modules on that bus lose communication simultaneously. Often caused by harness chafing inside the vehicle or by aftermarket wiring done incorrectly.

Our CAN bus diagnostic process:

We measure bus voltage levels and waveforms with an oscilloscope — actually looking at the network communication in real time, not just reading scan tool results. We verify bus terminating resistance is within spec (typically 60 ohms across the bus). We isolate which module on a multi-module bus is failing by progressively disconnecting modules and watching which one's removal restores normal communication. We trace wiring harness paths for chafing, water intrusion, and corroded connectors — Miami humidity is particularly hard on connector pins.

For brands where we run the factory diagnostic platform (Land Rover/Range Rover/Jaguar with PATHFINDER, Jeep with wiTECH 2, Honda/Acura with HDS, Subaru with SSM-IV, Volvo with VIDA, Mazda with their factory tool), we have direct access to module-level configuration and can identify network issues that generic scan tools miss entirely.

A/C Electrical Diagnosis Miami

A/C electrical faults are different from A/C refrigeration faults. The system can be fully charged with refrigerant and still not blow cold air because of an electrical fault somewhere in the control chain — blower motor relay, compressor clutch coil, pressure switches, climate control module, mode actuators, or the HVAC CAN bus path.

Common A/C electrical failure patterns:

Compressor doesn't engage when A/C is turned on — could be a low-pressure or high-pressure switch open, a failed compressor clutch coil, a relay failure, a fuse, a wiring fault, or a climate control module not commanding the clutch. Each requires different diagnosis.

Blower motor doesn't work at low speeds, works at high speed only — usually a failed blower motor resistor or blower motor controller module. The blower motor itself is often fine; the speed control circuit is the fault.

Climate control panel doesn't respond, or works intermittently — control module power supply issue, network communication fault preventing the climate module from receiving driver commands, or in some cases a failed touch panel/encoder switch.

Mode actuator doesn't change air direction — small motorized actuators control which vents air comes out of. A failed actuator or its position sensor causes the air to stay locked in one mode (often defrost only). Diagnosis is scan-tool driven — modern platforms report exact actuator position vs commanded position.

A/C electrical faults on luxury and European platforms — Mercedes, BMW, Audi, Land Rover, and Volvo HVAC systems are heavily computer-controlled with multiple actuators, dual-zone or quad-zone climate control, and integration with hybrid battery thermal management on PHEV/EV variants. These systems require manufacturer-platform diagnosis for accurate fault identification.

This is one of our highest-leverage service intersections — A/C diagnostics combined with electrical diagnosis on the same vehicle, executed together. Customers who come in for "A/C not cold" often have an electrical fault rather than a refrigeration fault, and the diagnostic path is electrical-first. See also our A/C Diagnostics & Repair page → for full A/C system coverage.

Intermittent Electrical Accessories

Power windows that work sometimes. Door locks that fail to respond intermittently. Lighting that flickers under certain conditions. HVAC controls that reset themselves randomly. Touch screens that go blank then come back. Intermittent electrical faults are the hardest electrical category to diagnose because they often aren't failing when the vehicle is in the shop.

What we do that other shops don't:

Capture freeze-frame data from past events. Modern modules log fault occurrences with environmental data — voltage at the moment of failure, vehicle speed, ambient temperature, time-since-key-on, sometimes GPS location. Even if the fault isn't happening right now, the stored history tells us what conditions trigger it.

Reproduce the failure conditions intentionally. If the customer says the windows fail only when it's hot, we let the car heat up in direct Miami sun for 90 minutes before testing. If the failure happens after long drives, we run the car at sustained temperature on a test loop. If the failure happens on rough roads, we test on a rough road. Reproducing the failure is the difference between guessing and diagnosing.

Test under wiggle and load. Many intermittent faults are wiring or connector issues that only fault when the wire moves, when the connector is loaded with current, or when temperature flex changes pin contact pressure. We wiggle harness paths and probe connector pins under load while watching scan tool data for the failure to appear.

Replace connectors and pins, not modules, when contact integrity is the issue. Connector pins corrode, lose tension, or contaminate over time — especially in Miami humidity. A connector clean and re-pin often resolves intermittent issues that would cost $1,200 if a module were replaced unnecessarily.

Hybrid & EV Electrical Diagnosis

Hybrid and EV electrical systems combine low-voltage (12V) automotive electrical with high-voltage (200V-800V depending on platform) propulsion systems. The two domains share data and coordinate operation but require separate diagnostic capability and significantly different safety equipment.

Why hybrid/EV electrical diagnosis is its own discipline:

High-voltage isolation monitoring — every hybrid and EV continuously monitors whether high-voltage current is leaking to chassis ground. When the system detects isolation loss (often shown as "Service Hybrid System" or "Reduced Power" warnings), the vehicle disables propulsion until the leak source is found. Identifying the leak requires manufacturer-level platform access and proper PPE (Class 0 high-voltage gloves, insulated tools, isolation measurement equipment).

Inverter and motor controller faults — the inverter converts high-voltage DC to AC for the drive motors. Inverter faults can appear as power loss, vibration, no-drive conditions, or specific fault codes. Diagnosis requires factory platform access to inverter parameters.

DC-to-DC converter failure — hybrids and EVs convert high-voltage power down to 12V to run conventional electrical accessories. A failed DC-to-DC converter causes the 12V battery to drain because nothing is replenishing it. Symptom looks like a dead 12V battery but the actual fault is upstream.

Hybrid control module coordination — the hybrid control module coordinates between engine, motor, battery, transmission, and brakes. Its commands depend on accurate input from each subsystem. A fault in any input cascades into a hybrid system warning.

Battery state-of-health analysis — high-voltage battery packs degrade over time. Individual cells can fail, dropping pack voltage and triggering warnings. Factory platforms read cell-level voltage and temperature; generic scan tools don't.

ASE L3 Hybrid/EV Specialist certification is the advanced credential for this work. Most independent Miami shops don't carry it. We do.

Platforms we service for hybrid/EV electrical:

• Jeep 4xe and Grand Cherokee 4xe (wiTECH 2)
• Land Rover Defender P400e, Range Rover P400e, Jaguar I-Pace EV (PATHFINDER)
• Volvo Recharge T8 PHEV and Polestar EV (VIDA)
• Mazda CX-90 PHEV and CX-70 PHEV (Mazda factory platform)
• Honda hybrid lineup, Acura hybrid lineup (HDS)
• Subaru Crosstrek Hybrid, Forester Hybrid, Solterra EV (Toyota Techstream + SSM-IV)
• Chrysler Pacifica Hybrid (wiTECH 2)
• Toyota and Lexus hybrid lineup (Techstream)

See our Hybrid & EV Repair hub → for the full hybrid service offering.

Electrical Specialty Depth by Brand

For the brands below, we go further than generic electrical diagnosis — factory diagnostic platforms, deep familiarity with brand-specific electrical failure patterns, and the tooling to match dealer capabilities.

Jeep — wiTECH 2 factory platform

The famous TIPM (Totally Integrated Power Module) failure pattern on 2007-2014 Wrangler JK, Grand Cherokee WK, Cherokee XJ, Ram 1500, and Dodge platforms — intermittent no-start, fuel pump failures, dead key fob with intact battery, electrical accessories cutting out, all from the same TIPM. We diagnose this pattern routinely and know exactly how to confirm it before replacing the module. Body Control Module faults on later WK2 and JL platforms. Charging system diagnosis including the integrated alternator/voltage regulator. Wrangler 4xe and Grand Cherokee 4xe high-voltage electrical via wiTECH 2 + ASE L3 Hybrid/EV. Jeep Repair →

Land Rover, Range Rover & Jaguar (JLR Group) — PATHFINDER factory platform

Range Rover air suspension electrical fault diagnosis — height sensors, compressor relay, EAS (Electronic Air Suspension) module communication. Infotainment and Touch Pro Duo module faults common on Range Rover Sport L494 and Velar. Body control module configuration and re-flash work. Module replacement requires factory-platform configuration that generic scan tools can't perform. Range Rover P400e PHEV and Jaguar I-Pace EV high-voltage diagnostics via PATHFINDER + ASE L3. Land Rover Repair → · Jaguar Repair →

Subaru — Subaru Select Monitor SSM-IV factory platform

Boxer-platform-specific charging system issues, particularly the alternator-to-battery cable corrosion pattern common on coastal Miami Subarus. EyeSight calibration prep after windshield replacement (a specific Subaru electrical procedure that requires SSM-IV). CAN bus diagnosis on the gateway module common to Outback, Forester, Crosstrek, Legacy, Ascent platforms. Crosstrek Hybrid, Forester Hybrid, and Solterra EV electrical via SSM-IV + Toyota Techstream + ASE L3. Subaru Repair →

Mazda — Mazda factory diagnostic platform

Skyactiv-G platform-specific charging and i-stop start/stop electrical faults. Body control module communication on CX-5, CX-9, CX-90, Mazda3 platforms. Advanced safety system (Mazda i-Activsense) calibration prep. CX-90 PHEV and CX-70 PHEV high-voltage electrical via Mazda factory platform + ASE L3 — one of the few Miami independents with this PHEV capability. Mazda Repair → · Mazda CX-90 PHEV →

Volvo — VIDA factory platform

Central Electronic Module (CEM) — Volvo's famous central electronic hub. CEM faults appear as a wide variety of symptoms because the CEM coordinates so many functions. We diagnose CEM issues routinely on aging XC90, XC60, S60, V60 platforms. Volvo charging system faults including the integrated alternator/battery management. Recharge T8 twin-engine PHEV electrical including high-voltage battery management, electric rear axle controller, and DC-to-DC converter diagnosis via VIDA + ASE L3. Polestar EV electrical including Polestar Performance variant tuning electrical. Volvo Repair →

Honda & Acura — HDS factory platform (full electrical service)

Charging system diagnosis including the J35 V6 alternator pattern, Honda's hybrid IMA and i-MMD system electrical (Insight, Accord Hybrid, CR-V Hybrid, Civic Hybrid, Acura MDX Type S Hybrid, RLX Sport Hybrid). Body control module and SRS module diagnosis. Honda-specific immobilizer programming. Maintenance Minder code decoding integrated into electrical history reads. Honda Repair → · Acura Repair →

Toyota & Lexus — Toyota Techstream platform (full electrical service)

Toyota and Lexus hybrid eCVT and inverter diagnosis. Steering system electrical including EPS (electric power steering) on most modern platforms. Toyota immobilizer programming. Full hybrid lineup high-voltage electrical via Techstream + ASE L3. Lexus Repair →

Ram, Chrysler & Dodge — wiTECH 2 factory platform

Shares TIPM failure pattern with Jeep on older platforms (Ram 1500, Dodge Charger/Challenger of the same era). Cummins diesel control module faults (note: complex Cummins diesel electrical work is limited while our diesel technician is on extended leave). Chrysler Pacifica Hybrid electrical via wiTECH 2 + ASE L3. Ram Repair →

In-Scope Electrical Work for German European Brands

For BMW, Mercedes-Benz, Audi, MINI Cooper, and Porsche we focus on the electrical service categories where our capability genuinely serves the customer well. For complex BMW/Mercedes/Audi/Porsche ECU programming, deep multi-module CAN bus reprogramming, key fob/immobilizer programming on German platforms, or factory module flash work, we refer you to a dedicated brand specialist.

What we do for German European brands:

• A/C electrical diagnosis (blower motor, climate control, mode actuators, compressor clutch electrical)
• Charging system electrical (alternator, battery, voltage regulator, cable connections)
• Basic battery, alternator, and starter replacement
• Lighting electrical (headlight, taillight, interior lighting, including HID/LED ballast diagnosis)
• Parasitic draw isolation testing — pull-fuse method works the same across all platforms
• Wiring repair on accessible harness paths (engine bay, undercarriage, accessible interior)
• Wheel speed sensor diagnosis and replacement (ABS, traction control wheel sensors)
• General code-reading and fault history review (we have dealer-level scan access on these platforms)

What we don't do on BMW, Mercedes, Audi, MINI Cooper, Porsche:

• Engine control module reprogramming or flashing
• Transmission control module reprogramming
• Key fob programming and immobilizer system work on German platforms
• Body control module reconfiguration after module replacement
• Complex multi-module CAN bus reprogramming requiring factory online subscription access
• iDrive, COMAND, MMI, or PCM infotainment module programming
• Air suspension module programming on Mercedes AIRMATIC or BMW air-equipped X5/X7

If your German vehicle needs electrical work that falls outside our scope, we'll tell you up front and recommend a specialist. We can still diagnose your issue and provide written findings for a second opinion before you authorize work at the dealer or a specialist — same hourly diagnostic rate, written findings you can use to negotiate.

Our Diagnostic Platform Investment

We run manufacturer-level diagnostic platforms — not generic OBD-II scanners — for the brands where we maintain specialty capability:

• PATHFINDER (Land Rover, Range Rover, Jaguar — JLR Group)
• wiTECH 2 (Jeep, Ram, Chrysler, Dodge — Stellantis)
• HDS Honda Diagnostic System (Honda, Acura)
• Subaru Select Monitor SSM-IV (Subaru)
• VIDA (Volvo, Polestar)
• Mazda factory diagnostic platform (Mazda)
• Toyota Techstream (Toyota, Lexus, plus Toyota-platform vehicles including Subaru Crosstrek Hybrid)

For European luxury brands (BMW, Mercedes-Benz, Audi, Porsche, MINI Cooper), we maintain dealer-level scan tool access sufficient for the in-scope electrical service categories above. We do not run BMW ISTA, Mercedes XENTRY, Audi ODIS, or Porsche PIWIS for engine module programming, transmission programming, or complex multi-module reprogramming work.

For dedicated electrical depth that goes beyond factory scan tools, our diagnostic kit includes oscilloscopes, professional amp clamps with milliamp resolution for parasitic testing, current probes for inductive measurement, and breakout boxes for direct signal access at module connectors.

Electrical Diagnostic Pricing

Diagnostic fee is one hour of our hourly labor rate for your vehicle. Mainstream platforms (Honda, Toyota, Ford, mainstream Jeep, mainstream Subaru) typically $165. Luxury and complex platforms (Land Rover, Range Rover, Jaguar, Volvo Recharge T8, Mazda CX-90 PHEV, German European in-scope work) typically $215–$245. Service writer quotes your specific vehicle's rate at booking.

Complex multi-module electrical diagnostics (intermittent faults requiring reproduction, CAN bus issues requiring oscilloscope analysis, parasitic draw isolation requiring sleep-state monitoring) may need additional time. We quote the additional time before we start. You always know what the next 30 minutes will cost before we commit to it.

If you authorize repairs at Green's after the diagnostic, the diagnostic fee applies toward the repair bill.

If you don't authorize repairs, the diagnostic fee covers the work and the written findings — you walk away with a document you can use to negotiate with the original shop, take to a specialist, or use to make the keep-or-sell decision on the vehicle.

No upsell pressure on parts replacement. If we find that a previous shop's quoted module replacement isn't needed — that the actual fault is a wiring repair or a voltage supply issue — we'll tell you. We'd rather tell you the truth and lose the $1,800 module replacement than do unnecessary work and lose the customer for life.

All electrical repair work covered under our 2-year / 24,000-mile warranty on parts and labor — among the strongest in independent auto repair in Miami.

Why Miami Drivers Choose Green's Garage for Electrical Work

• Since 1957. Three generations of family ownership. We've diagnosed electrical failures across multiple decades and multiple generations of automotive electrical architecture.
• ASE Master Certified technicians across European, Japanese, American, and luxury platforms.
• ASE L3 Hybrid/EV Specialist for high-voltage system diagnosis. The advanced credential most independent shops don't carry.
• AAA Approved and NAPA AutoCare member.
• Manufacturer-level diagnostic platforms — PATHFINDER, wiTECH 2, HDS, SSM-IV, VIDA, Mazda factory tool, Toyota Techstream.
• Oscilloscope, milliamp-resolution amp clamps, current probes, breakout boxes — physical diagnostic tools beyond what generic OBD-II shops use.
• 2-year / 24,000-mile warranty on electrical repairs.
• Written findings before any repair authorization. Always.
• Same-week appointment availability vs. dealer 2-4 week wait.
• Honest scope of work. We tell you up front what's in our wheelhouse and what isn't.
• Habla Español. Native Caribbean Spanish service.
• Free Uber / Lyft within 5 miles while we work on your car.
• Independent, not a franchise.

Miami Neighborhoods We Serve for Electrical Work

South Florida's humidity, heat, and proximity to salt air contribute to: increased wiring corrosion, connector oxidation, water intrusion in body harness paths, charging system stress from sustained heat soak, and accelerated battery wear. We see all of these climate-driven electrical patterns regularly. Free Uber or Lyft within a 5-mile radius while we work on your car.

Electrical Repair FAQ

How much does an electrical diagnostic cost? Diagnostic is one hour of our hourly labor rate for your vehicle — typically $165 for mainstream platforms, up to $245 for luxury or complex multi-module work. That covers the symptom interview, manufacturer-level scan, targeted physical testing, and written findings. If you authorize repairs at Green's, the diagnostic fee applies toward the repair bill.

My battery keeps dying. I've replaced it twice. What's wrong? You have a parasitic draw — something is consuming current while the car is supposed to be asleep. Replacing the battery doesn't fix the draw; it just resets the clock on how long until the new battery is drained. The diagnosis is to measure key-off current, then systematically isolate which circuit is drawing power, then trace that circuit to the actual fault (module not sleeping, alternator diode leak, aftermarket accessory wired incorrectly, wiring short). Same-week appointments available.

Multiple warning lights came on at the same time. Do I have multiple problems? Usually no. Multiple simultaneous warning lights almost always indicate a single underlying cause — voltage instability, a network communication interruption, or a shared sensor failure. We diagnose the single root cause and quote the actual fix, not four separate repairs.

The other shop said I need a new control module. Should I get a second opinion? Yes, before you authorize. Modules are expensive ($800-$3,500 depending on platform) and are routinely misdiagnosed when the actual fault is a wiring issue or voltage supply problem upstream. We verify power, ground, and communication integrity at the module before declaring it faulty. See our Second Opinion page → for how the second-opinion process works.

Can you program a module if I supply the part? On platforms where we run the factory diagnostic system (Land Rover/Range Rover/Jaguar with PATHFINDER, Jeep/Ram/Chrysler with wiTECH 2, Honda/Acura with HDS, Subaru with SSM-IV, Volvo with VIDA, Mazda with their factory tool, Toyota/Lexus with Techstream), yes — we can program/configure the module to your vehicle. For BMW/Mercedes/Audi/Porsche/MINI Cooper module programming, we refer to a brand specialist.

My check engine light comes on, then goes off on its own. Is this serious? Could be, depending on what code is being stored. Intermittent codes that clear themselves on the next drive cycle still get logged in module history. We read the stored history, see the freeze-frame data captured at the moment of the fault, and identify whether the issue is significant or benign. Same-week appointments available.

Can you diagnose a key fob or immobilizer issue? On the brands we maintain factory platform access for — yes. Jeep (wiTECH 2 covers key programming and immobilizer pairing), Honda/Acura (HDS), Subaru (SSM-IV), Toyota/Lexus (Techstream), Mazda, and Land Rover/Range Rover/Jaguar (PATHFINDER) — all in scope. BMW, Mercedes, Audi, Porsche, MINI Cooper key fob programming is referred to specialists who run the corresponding factory platforms.

Can electrical problems affect engine or transmission performance? Yes. Voltage instability affects engine management decisions, transmission shifting, and ABS calibration. Module communication faults can produce engine performance symptoms that look like mechanical issues. We diagnose the electrical root cause before quoting any mechanical repair.

Do you work on hybrid and EV electrical systems? Yes — we're ASE L3 Hybrid/EV Specialist certified, the advanced credential for high-voltage work. See the Hybrid & EV electrical section above for the platforms we service.

Will electrical work at Green's void my factory warranty? No. Under the federal Magnuson-Moss Warranty Act, independent shops can service your vehicle without voiding the factory warranty, as long as we use equivalent parts and procedures. We document everything to manufacturer specification for your records.

Habla Español? Sí. Tenemos personal que habla español caribeño nativo. Le explicaremos los hallazgos del diagnóstico eléctrico y las opciones de reparación en español si lo prefiere. Visita nuestra página en español →

Ready to Get Your Electrical System Diagnosed Properly?

Call (305) 444-8881 for same-week appointments — often same-day for urgent issues like no-start conditions, repeated battery drains, or hybrid system warnings. Schedule online and you'll have a confirmation within one business hour.

If you have a written estimate from another shop and want a second opinion on what they quoted, bring it. We'll do our own diagnostic from scratch and compare notes after. See our Second Opinion on Your Estimate page → for how the second opinion process works.

2221 SW 32nd Ave, Miami — three blocks from the Coral Gables border, off US-1.

Habla Español. Free Uber/Lyft within 5 miles while we work. 2-year / 24,000-mile warranty on electrical repairs. Independent since 1957.