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By CarCodes Editorial · Research by Kim Minseong

Research checked 2026-11-01 · US vehicles

Browse all public CarCodes categories and source-linked pages in one human-readable index.

Codes

P0010 Code: Bank 1 cam-actuator electrical circuitP0011 Code: Bank 1 intake timing too advancedP0012 Code: Bank 1 intake timing too retardedP0014 Code: Bank 1 exhaust timing too advancedP0101 Code: Airflow measurement performance mismatchP0102 Code: Airflow-sensor circuit signal lowP0103 Code: Airflow-sensor circuit signal highP0113 Code: Intake-air temperature signal highP0128 Code: Warm-up below thermostat-regulation expectationP0131 Code: Bank 1 sensor 1 oxygen signal lowP0135 Code: Bank 1 sensor 1 heater faultP0155 Code: Bank 2 sensor 1 heater faultP0171 Code: Bank 1 mixture too leanP0174 Code: Bank 2 mixture too leanP0300 Code: Random or multiple-cylinder misfireP0301 Code: Misfire reported for cylinder 1P0302 Code: Misfire reported for cylinder 2P0303 Code: Misfire reported for cylinder 3P0304 Code: Misfire reported for cylinder 4P0305 Code: Misfire reported for cylinder 5P0306 Code: Misfire reported for cylinder 6P0307 Code: Misfire reported for cylinder 7P0308 Code: Misfire reported for cylinder 8P0325 Code: Bank 1 knock-sensor circuit faultP0340 Code: Camshaft-position sensor circuit faultP0401 Code: EGR flow below expected amountP0420 Code: Bank 1 catalyst-efficiency threshold not metP0430 Code: Bank 2 catalyst-efficiency threshold not metP0440 Code: Evaporative-emission system faultP0442 Code: Small evaporative-system leakP0446 Code: Vent-control electrical circuit faultP0455 Code: Large evaporative-system leakP0456 Code: Very small evaporative-system leakP0457 Code: Evaporative leak with cap-loose/off contextP0700 Code: Transmission controller requests warning-lamp illuminationP0715 Code: Input/turbine speed-sensor circuit faultP0741 Code: Torque-converter clutch not engaging as expectedP1101 Code: Intake-airflow performance mismatchP1326 Code: Knock/KSDS-related fault; N-model water-intrusion branchP1326 Code: KSDS knock-signal fault requiring the campaign diagnostic branchP1450 Code: Fuel-tank vacuum cannot be relieved as expectedP1A9096 Code: ICCU fault identifier used in recall diagnosticsP2682 Code: Thermal-control/bypass-valve electrical circuit contextP26CC Code: Engine coolant-pump circuit low voltageU0100 Code: Engine/powertrain module communication lostU0121 Code: Brake-control module communication lostU0140 Code: Body-control module communication lostU3012:68 Code: ABS startup communication-related fault in the Ford bulletinP0130 Code: Bank 1 Sensor 1 oxygen-sensor circuit faultP0141 Code: Bank 1 Sensor 2 oxygen-sensor heater circuit faultP0335 Code: Crankshaft-position sensor A circuit faultP0500 Code: Vehicle-speed sensor circuit faultOBD-II Trouble Codes: Search Meaning and Next Steps120308 BMW Code: Document-Scoped Meaning2C57 BMW Code: Document-Scoped MeaningP0126 Mazda Code: Document-Scoped MeaningP050D General Motors Code: Document-Scoped MeaningP052E Mercedes-Benz Code: Document-Scoped MeaningP059F General Motors Code: Document-Scoped MeaningP06DA Mercedes-Benz Code: Document-Scoped MeaningP0A80 Toyota Code: Document-Scoped MeaningP0AA6 Manufacturer Code: Document-Scoped MeaningP0C73 Manufacturer Code: Document-Scoped MeaningP1890 American Honda Code: Document-Scoped MeaningP1B25 Manufacturer Code: Document-Scoped MeaningP1B77 Manufacturer Code: Document-Scoped MeaningP1C2D Hyundai Code: Document-Scoped MeaningP219B American Honda Code: Document-Scoped MeaningP2681 Toyota Code: Document-Scoped MeaningP2797 Subaru Code: Document-Scoped MeaningManufacturer Code Research Index and Source Status

Alerts

Tesla APP_w009 Alert: 2020–2024 Model Y MeaningTesla APP_w207 Alert: 2020–2024 Model Y MeaningTesla APP_w396 Alert: 2020–2024 Model Y MeaningTesla BMS_a027 Alert: 2020–2024 Model Y MeaningTesla BMS_a035 Alert: 2020–2024 Model Y MeaningTesla BMS_a067 Alert: 2020–2024 Model Y MeaningTesla BMS_a074 Alert: 2020–2024 Model Y MeaningTesla BMS_a079 Alert: 2020–2024 Model Y MeaningTesla BMS_a123 Alert: 2020–2024 Model Y MeaningTesla CC_a001 Alert: 2020–2024 Model Y MeaningTesla VCFRONT_a191 Alert: 2020–2024 Model Y MeaningTesla VCFRONT_a216 Alert: 2020–2024 Model Y MeaningTesla VCFRONT_a592 Alert: 2020–2024 Model Y MeaningTesla Screen Alert IDs: Source and Review StatusVehicle Screen Alerts: Separate From OBD-II Codes

Maintenance

Honda Maintenance Minder Code A: 2025 CR-V Hybrid USHonda Maintenance Minder Code B: 2025 CR-V Hybrid USHonda Maintenance Minder Code 1: 2025 CR-V Hybrid USHonda Maintenance Minder Code 2: 2025 CR-V Hybrid USHonda Maintenance Minder Code 3: 2025 CR-V Hybrid USHonda Maintenance Minder Code 4: 2025 CR-V Hybrid USHonda Maintenance Minder Code 5: 2025 CR-V Hybrid USHonda Maintenance Minder Code 6: 2025 CR-V Hybrid USHonda Maintenance Minder Code 7: 2025 CR-V Hybrid USHonda Maintenance Minder Code 2: 2026 CR-V gasoline USHonda Maintenance Minder Code 4: 2026 CR-V gasoline USHonda Maintenance Minder Codes: Manual ScopeMaintenance Reminders vs Trouble Codes

Warning Lights

Check Engine Light — steady: Meaning and Safe Next StepsCheck Engine Light — flashing: Meaning and Safe Next StepsEngine oil pressure warning: Meaning and Safe Next StepsEngine oil level warning: Meaning and Safe Next StepsHigh coolant temperature / overheating: Meaning and Safe Next StepsCoolant level/system warning: Meaning and Safe Next StepsBattery / charging-system warning: Meaning and Safe Next StepsLow fuel indicator: Meaning and Safe Next StepsTPMS — steady low-pressure indication: Meaning and Safe Next StepsTPMS — flashes then stays on: Meaning and Safe Next StepsBrake-system warning: Meaning and Safe Next StepsABS warning: Meaning and Safe Next StepsABS and BRAKE warnings together: Meaning and Safe Next StepsESC / traction control — active flashing: Meaning and Safe Next StepsESC / traction control — persistent warning: Meaning and Safe Next StepsESC / traction control OFF: Meaning and Safe Next StepsAirbag / SRS readiness warning: Meaning and Safe Next StepsPassenger airbag OFF indicator: Meaning and Safe Next StepsPower-steering warning: Meaning and Safe Next StepsElectronic parking-brake warning: Meaning and Safe Next StepsMaster warning / central warning: Meaning and Safe Next StepsRoutine maintenance/service reminder: Meaning and Safe Next StepsKey / immobilizer message: Meaning and Safe Next StepsDoor / hood / rear-lid open: Meaning and Safe Next StepsExterior-light malfunction: Meaning and Safe Next StepsStart-stop unavailable: Meaning and Safe Next StepsFord powertrain / wrench warning: Meaning and Safe Next Steps2025 F-150 oil-pressure warning: Meaning and Safe Next StepsChevrolet StabiliTrak / ESC warning: Meaning and Safe Next StepsReduced Acceleration — Drive With Care: Meaning and Safe Next StepsToyota master warning: Meaning and Safe Next StepsToyota slip/VSC or TRAC OFF indication: Meaning and Safe Next StepsCVT Malfunction Service now: Meaning and Safe Next StepsCVT Malfunction Stop safely: Meaning and Safe Next StepsCVT hot Power reduced: Meaning and Safe Next StepsAWD Error: Meaning and Safe Next StepsJeep Electronic Throttle Control — steady: Meaning and Safe Next StepsJeep Electronic Throttle Control — flashing: Meaning and Safe Next StepsEyeSight temporary stop — No Camera View: Meaning and Safe Next StepsEyeSight temporary stop — Temp Range: Meaning and Safe Next StepsEyeSight Off / Check Manual — malfunction: Meaning and Safe Next StepsKia EPB warning with ESC warning: Meaning and Safe Next StepsMazda CX-5 ABS and brake warnings: Meaning and Safe Next StepsVolkswagen EPC: Meaning and Safe Next StepsVolkswagen DSG too hot: Meaning and Safe Next StepsVolkswagen AdBlue red warning: Meaning and Safe Next StepsVolkswagen diesel particulate filter warning: Meaning and Safe Next StepsVolkswagen diesel glow-plug indicator: Meaning and Safe Next StepsVolkswagen red hybrid-system warning: Meaning and Safe Next StepsVolkswagen electric drive fault: Meaning and Safe Next StepsBMW Check Control message: Meaning and Safe Next StepsDashboard Warning Lights: Meaning and Safe ActionsTesla Power Reduced Alert: Read the Exact Message

Messages

Stellantis Service DEF System See Dealer / speed-limit countdown: Source-Scoped MessageNissan Unavailable Front Radar Obstruction: Source-Scoped MessageHyundai Hybrid System Warning — stop and do not drive: Source-Scoped MessageMazda F0-002: Source-Scoped MessageBMW Drivetrain Malfunction: Source-Scoped MessageGeneral Motors Service Trailer Brake: Source-Scoped MessageManufacturer Dashboard Messages and Status Indicators

Vehicles

Alfa Romeo Giulia Warning Lights and CodesChevrolet Blazer Manufacturer Document ResearchChevrolet Blazer EV Manufacturer Document ResearchChevrolet Camaro Warning Lights and CodesChevrolet Colorado Manufacturer Document ResearchChevrolet Cruze Warning Lights and CodesChevrolet Equinox Manufacturer Document ResearchChevrolet Equinox EV Manufacturer Document ResearchChevrolet Silverado Manufacturer Document ResearchChevrolet Silverado 2500HD Warning Lights and CodesChevrolet Silverado 3500HD Warning Lights and CodesChevrolet Silverado EV Manufacturer Document ResearchChevrolet Suburban Manufacturer Document ResearchChevrolet Tahoe Manufacturer Document ResearchChevrolet Trailblazer Manufacturer Document ResearchChevrolet Traverse Manufacturer Document ResearchChevrolet Trax Manufacturer Document ResearchFord Bronco Warning Lights and CodesFord Escape Warning Lights and CodesFord Expedition Warning Lights and CodesFord F-150 Warning Lights and CodesFord Fusion Warning Lights and CodesFord Mustang Warning Lights and CodesFord Ranger Warning Lights and CodesHonda Accord Warning Lights and CodesHonda CR-V Warning Lights and CodesHonda Civic Warning Lights and CodesHonda Odyssey Manufacturer Document ResearchHonda Pilot Manufacturer Document ResearchHonda Ridgeline Manufacturer Document ResearchHyundai Elantra N Warning Lights and CodesHyundai IONIQ 5 Warning Lights and CodesHyundai IONIQ 6 Warning Lights and CodesHyundai Kona N Warning Lights and CodesHyundai Tucson Warning Lights and CodesHyundai Veloster N Warning Lights and CodesJeep Wrangler Warning Lights and CodesKia Optima Warning Lights and CodesKia Sorento Warning Lights and CodesKia Sportage Warning Lights and CodesLincoln Navigator Warning Lights and CodesMazda CX-5 Warning Lights and CodesMercury Mariner Warning Lights and CodesMercury Milan Warning Lights and CodesNissan Altima Manufacturer Document ResearchNissan Armada Manufacturer Document ResearchNissan Frontier Manufacturer Document ResearchNissan Kicks Manufacturer Document ResearchNissan LEAF Manufacturer Document ResearchNissan Murano Manufacturer Document ResearchNissan Pathfinder Manufacturer Document ResearchNissan Rogue Warning Lights and CodesNissan Sentra Manufacturer Document ResearchNissan Z Manufacturer Document ResearchSubaru BRZ Warning Lights and CodesSubaru Crosstrek Warning Lights and CodesSubaru Forester Warning Lights and CodesSubaru Legacy Warning Lights and CodesSubaru Outback Warning Lights and CodesTesla Model Y Warning Lights and CodesToyota Camry Warning Lights and CodesToyota Corolla Warning Lights and CodesToyota Matrix Warning Lights and CodesVolkswagen Jetta Warning Lights and CodesToyota RAV4 Warning Lights and CodesNissan Maxima Manufacturer Document ResearchNissan Quest Manufacturer Document ResearchFord Explorer Manufacturer Document ResearchFord Transit Manufacturer Document ResearchGMC Sierra Manufacturer Document ResearchToyota Camry Hybrid Manufacturer Document ResearchNissan NV200 Manufacturer Document ResearchNissan NV200 Taxi Manufacturer Document ResearchSubaru Impreza Manufacturer Document ResearchSubaru WRX Manufacturer Document ResearchSubaru Ascent Manufacturer Document ResearchBuick Encore GX Manufacturer Document ResearchBuick Enclave Manufacturer Document ResearchCadillac XT4 Manufacturer Document ResearchChevrolet Traverse Limited Manufacturer Document ResearchGMC Acadia Manufacturer Document ResearchGMC Terrain Manufacturer Document ResearchHyundai Sonata Manufacturer Document ResearchHyundai Santa Fe Manufacturer Document ResearchHyundai Palisade Manufacturer Document ResearchChevrolet Silverado 1500 Manufacturer Document ResearchGMC Sierra 1500 Manufacturer Document ResearchChevrolet Malibu Manufacturer Document ResearchBuick Regal Manufacturer Document ResearchCadillac ATS Manufacturer Document ResearchCadillac CTS Manufacturer Document ResearchChevrolet Impala Manufacturer Document ResearchToyota Prius Manufacturer Document ResearchToyota Prius Plug-in Hybrid Manufacturer Document ResearchBuick Envision Manufacturer Document ResearchGMC Canyon Manufacturer Document ResearchNissan ARIYA Manufacturer Document ResearchNissan Murano Hybrid Manufacturer Document ResearchNissan Rogue Sport Manufacturer Document ResearchNissan Versa Manufacturer Document ResearchNissan Rogue Hybrid Manufacturer Document ResearchJeep Cherokee Manufacturer Document ResearchChrysler 200 Manufacturer Document ResearchHyundai Sonata Hybrid Manufacturer Document ResearchKia Optima Hybrid Manufacturer Document ResearchMazda Mazda3 Manufacturer Document ResearchMazda CX-30 Manufacturer Document ResearchMazda MX-30 Manufacturer Document ResearchFord Super Duty Manufacturer Document ResearchBuick Encore Manufacturer Document ResearchBuick LaCrosse Manufacturer Document ResearchCadillac XT5 Manufacturer Document ResearchCadillac XT6 Manufacturer Document ResearchChevrolet Cruze Gen II Manufacturer Document ResearchChevrolet Silverado 1500 New Manufacturer Document ResearchChevrolet Silverado 1500 LTD Manufacturer Document ResearchGMC Sierra 1500 New Manufacturer Document ResearchGMC Sierra 1500 Limited Manufacturer Document ResearchFord Edge Manufacturer Document ResearchLincoln MKZ Manufacturer Document ResearchLincoln MKC Manufacturer Document ResearchChevrolet Volt Manufacturer Document ResearchHonda Civic Type R Manufacturer Document ResearchToyota Avalon Hybrid Manufacturer Document ResearchToyota Avalon Manufacturer Document ResearchToyota Corolla Hatchback Manufacturer Document ResearchToyota RAV4 Hybrid Manufacturer Document ResearchToyota RAV4 Prime Manufacturer Document ResearchToyota Highlander Hybrid Manufacturer Document ResearchToyota Sienna Hybrid Manufacturer Document ResearchToyota Venza Hybrid Manufacturer Document ResearchKia Niro Manufacturer Document ResearchKia Niro Plug-in Hybrid Manufacturer Document ResearchMazda CX-3 Manufacturer Document ResearchMazda Mazda6 Manufacturer Document ResearchAudi A6 Manufacturer Document ResearchAudi A7 Manufacturer Document ResearchAudi S4 Manufacturer Document ResearchAudi A8 Manufacturer Document ResearchAudi Q7 Manufacturer Document ResearchAudi A5 Manufacturer Document ResearchAudi S5 Cabriolet Manufacturer Document ResearchAudi Q5 Manufacturer Document ResearchPorsche Cayenne Manufacturer Document ResearchPorsche Panamera Manufacturer Document ResearchVolvo XC90 Manufacturer Document ResearchMitsubishi Mirage Manufacturer Document ResearchCadillac Escalade Manufacturer Document ResearchChevrolet Corvette Manufacturer Document ResearchChevrolet Silverado LD Manufacturer Document ResearchGMC Sierra Limited Manufacturer Document ResearchBuick Envista Manufacturer Document ResearchFord Mustang Mach-E Manufacturer Document ResearchChevrolet Bolt EV Manufacturer Document ResearchChevrolet Bolt EUV Manufacturer Document ResearchToyota Sequoia Manufacturer Document ResearchToyota Tundra Manufacturer Document ResearchHyundai Sonata N Line Manufacturer Document ResearchHyundai Santa Cruz Manufacturer Document ResearchKia Carnival Hybrid Manufacturer Document ResearchCadillac LYRIQ Manufacturer Document ResearchGMC HUMMER EV Manufacturer Document ResearchGMC HUMMER EV SUV Manufacturer Document ResearchChrysler Pacifica Hybrid Manufacturer Document ResearchDodge Hornet Warning Lights and CodesFiat 500 Warning Lights and CodesFiat 500X Warning Lights and CodesMINI Cooper 2 Door Warning Lights and CodesMINI Countryman Warning Lights and CodesMINI Clubman Warning Lights and CodesPolestar Polestar 2 Warning Lights and CodesPolestar Polestar 4 Warning Lights and CodesRivian R1S Warning Lights and CodesRivian R1T Warning Lights and CodesLexus GX Warning Lights and CodesAlfa Romeo Warning Lights and Trouble Code GuideChevrolet Warning Lights and Trouble Code GuideFord Warning Lights and Trouble Code GuideHonda Warning Lights and Trouble Code GuideHyundai Warning Lights and Trouble Code GuideJeep Warning Lights and Trouble Code GuideKia Warning Lights and Trouble Code GuideLincoln Warning Lights and Trouble Code GuideMazda Warning Lights and Trouble Code GuideMercedes-Benz Warning Lights and Trouble Code GuideMercury Warning Lights and Trouble Code GuideNissan Warning Lights and Trouble Code GuideSubaru Warning Lights and Trouble Code GuideTesla Warning Lights and Trouble Code GuideToyota Warning Lights and Trouble Code GuideVolkswagen Warning Lights and Trouble Code GuideGMC Warning Lights and Trouble Code GuideBuick Warning Lights and Trouble Code GuideCadillac Warning Lights and Trouble Code GuideRam Warning Lights and Trouble Code GuideChrysler Warning Lights and Trouble Code GuideBMW Warning Lights and Trouble Code GuideAudi Warning Lights and Trouble Code GuidePorsche Warning Lights and Trouble Code GuideVolvo Warning Lights and Trouble Code GuideMitsubishi Warning Lights and Trouble Code GuideAcura Warning Lights and Trouble Code GuideDodge Warning Lights and Trouble Code GuideFiat Warning Lights and Trouble Code GuideGenesis Warning Lights and Trouble Code GuideInfiniti Warning Lights and Trouble Code GuideJaguar Warning Lights and Trouble Code GuideLand Rover Warning Lights and Trouble Code GuideLexus Warning Lights and Trouble Code GuideLucid Warning Lights and Trouble Code GuideMINI Warning Lights and Trouble Code GuidePolestar Warning Lights and Trouble Code GuideRivian Warning Lights and Trouble Code GuideVehicles: US Makes, Models, and Documented YearsScion US Model Archive: 2015 NHTSA NamesPontiac US Model Archive: 2008 NHTSA NamesSaturn US Model Archive: 2008 NHTSA NamesHummer US Model Archive: 2008 NHTSA NamesSaab US Model Archive: 2010 NHTSA NamesSuzuki US Model Archive: 2012 NHTSA NamesIsuzu US Model Archive: 2008 NHTSA NamesSmart US Model Archive: 2016 NHTSA NamesMaserati US Model Archive: 2025 NHTSA NamesOldsmobile US Model Archive: 2004 NHTSA NamesPlymouth US Model Archive: 2000 NHTSA Names2018 Ford F-150 Warning Lights and Codes2018 F-150 3.5L EcoBoost Warning and Code Guide2025 Toyota RAV4 Hybrid Warning Light Guide2020 Subaru Outback Warning Lights and Codes2025 Tesla Model Y Alerts and Warning Messages2019 Volkswagen Jetta Warning Lights and EPC

Cases

Nissan V6 CVT judder: P17F0/P17F1 are inspection branches: Source-Scope ResearchFord 10R80 harsh/delayed shifts: CDF hydraulic leakage: Source-Scope ResearchGM L5P emissions codes: rule out an exhaust leak: Source-Scope ResearchCamry Hybrid cooling debris with P0A80/P0A7F: Source-Scope ResearchHonda injector-related emissions faults and coverage: Source-Scope ResearchNissan NV200 CVT: belt-slip and control-valve branches: Source-Scope ResearchSubaru CVT circuit-low versus circuit-high faults: Source-Scope ResearchGM P0746/P0747: inspect the clutch, not an assumed valve-body fault: Source-Scope ResearchHonda CVT P1890: software-only versus transmission repair: Source-Scope ResearchHyundai transmission speed-sensor faults: preserve source ambiguities: Source-Scope ResearchGM LM2 turbo actuator fasteners: replacement is conditional: Source-Scope ResearchRam DEF P208B/P20E8: avoid an unproven pump replacement: Source-Scope ResearchEquinox/Terrain LSD: distinguish charge-air hose code combinations: Source-Scope ResearchMalibu LFV extreme-cold charge-air icing: Source-Scope ResearchGM P00B7/P2181: cooling-path blockage rather than a guessed thermostat: Source-Scope ResearchGM LM2 P06DD/P2B60/P26BB/P1098: calibration branch: Source-Scope ResearchPrius brake booster: multiple brake warnings with selected chassis codes: Source-Scope ResearchMercedes M274 P052E71: model-specific ventilation repair branches: Source-Scope Research2016 Envision: wheel-speed sensor internal short: Source-Scope ResearchColorado/Canyon: EBCM connector intrusion can mimic sensor faults: Source-Scope ResearchNissan front-radar obstruction: weather and replacement are different branches: Source-Scope ResearchCherokee/Chrysler 200 seat-side-airbag circuit open: Source-Scope ResearchSonata Hybrid no READY: power-relay/safety-plug diagnosis: Source-Scope ResearchOptima Hybrid P1B25/P1B77 and WTY029 fuse coverage: Source-Scope ResearchMazda transport mode: P2610/P2507 may require context: Source-Scope ResearchMazda touch-handle locking failure: LFU software and secondary codes: Source-Scope ResearchVolkswagen CCTA/CBFA P2014/P2015 intake-manifold branch: Source-Scope ResearchFord diesel DEF codes: connector moisture and fretting: Source-Scope ResearchBMW N55 2C57/120308: air path and vacuum diagnosis first: Source-Scope ResearchBMW Valvetronic and boost faults: mechanical versus software: Source-Scope ResearchGM stop/start and LIN codes: battery monitor is not automatically bad: Source-Scope ResearchFord 2.0 EcoBoost white exhaust and coolant loss: confirm cylinder intrusion: Source-Scope ResearchSubaru battery goes flat while parked: distinguish standby draw from battery health: Source-Scope ResearchGM Shift to Park while already in Park: separate harness and shifter branches: Source-Scope ResearchHonda Civic warm A/C: shaft-seal diagnosis before compressor replacement: Source-Scope ResearchNissan LEAF P31E7 with P0AA6: battery-module isolation diagnosis: Source-Scope ResearchToyota Engine Maintenance Required with P268111 or P268115: Source-Scope ResearchSonata Hybrid YF pump codes: verify commanded cooling-pump operation: Source-Scope ResearchKia Niro P2600/P0C73: partial pump repair versus complete replacement: Source-Scope ResearchSubaru P2797 after stop/start: a TCM calibration branch: Source-Scope ResearchMazda P0126 slow warm-up: thermostat, PCM and eligibility gates: Source-Scope Research2026 Mazda3/CX-30 P0126: DRW59 software-only campaign branch: Source-Scope ResearchMercedes P06DA00: model-year-dependent Y130 diagnostic guidance: Source-Scope ResearchAudi P0491 and P0492 together: secondary-air restriction diagnosis: Source-Scope ResearchPorsche Cayenne/Panamera multiple code families: cam-adjuster mechanical check: Source-Scope Research2016 Volvo XC90 P017100: prove resonator leakage before replacing a sensor: Source-Scope ResearchMitsubishi Mirage P1590/P1797: investigate a diagnostic-port tracking device: Source-Scope ResearchFCA no-crank after service: auxiliary battery and power-distribution checks: Source-Scope Research2016–2017 Honda Pilot 6AT judder: verify fluid deterioration and software: Source-Scope ResearchGM V8 cold P050D/P0300: diagnose before opening the engine: Source-Scope ResearchGM 2.5 LK0 P050D: injector replacement plus PCM update branch: Source-Scope ResearchGM P059F: inspect a bent support bracket before replacing grille shutters: Source-Scope ResearchGM 1.2 LIH early oil consumption: camshaft-cover diagnostic branch: Source-Scope ResearchMustang Mach-E P0ADA: later-build software route and recall exclusion: Source-Scope ResearchEarly Mustang Mach-E warning cluster: HVBJB hardware branch: Source-Scope Research2021 Bolt P0534 with warm A/C: verify ACCM seal leakage: Source-Scope Research2022 Bolt P0534 without cooling loss: software versus actual leak: Source-Scope ResearchToyota 3UR P2440/P2442: secondary-air icing/debris calibration branch: Source-Scope Research2009–2014 F-150 crank/no-start: fuse-27 heat damage gate: Source-Scope ResearchHyundai wet 8DCT P1C2D03: Recall 236 repair selection: Source-Scope ResearchImpala/Malibu brake-vacuum codes: revised pipe requires matching cap and connector: Source-Scope Research2025 Carnival Hybrid P0C7300: MCU logic update, not assumed pump failure: Source-Scope ResearchGM Ultium isolation and thermal-priority codes: specialist escalation before parts: Source-Scope Research2017 Pacifica Hybrid isolation/no-restart: BPCM software distinction: Source-Scope ResearchManufacturer Service Case Research for US Vehicles

Guides

P0126: older thermostat route versus 2026 PCM logic: Source ComparisonP0C73: Sonata, Niro and Carnival are different repairs: Source ComparisonMach-E P0ADA: production date and recall gate: Source ComparisonBolt P0534: verified leak versus diagnostic software: Source ComparisonGM P050D: V8, LK0 and LIH must not be conflated: Source ComparisonNo dashboard code is still a useful diagnostic scenario: Source ComparisonHigh-voltage isolation: module fault, software distinction and escalation: Source ComparisonCompare Similar Car Codes Across Manufacturer DocumentsMisfire: preserve evidence before buying ignition partsLean/rich correction: separate intake, measurement and fuel causesAirflow measurement: check installation before sensorsTemperature sensor and thermostat monitoringCam timing/correlation needs engine-specific diagnosisOxygen/A/F sensor circuit and heater diagnosisCatalyst-efficiency code: investigate before replacing the converterEVAP: fuel-cap check is conditional, not the whole diagnosisThrottle/pedal control warning and circuit code triageKnock/KSDS codes require manufacturer contextEGR flow discrepancy: distinguish flow from controlTransmission codes: retrieve the module’s own evidenceCommunication codes: identify power and network contextControl-module internal/programming code evaluationBrake/ABS/EPB: safety overrides code lookupTPMS: measure pressure before choosing sensorsLow-voltage charging warning: identify vehicle architectureADAS unavailable: visibility condition versus system faultEV/hybrid drive or isolation warningThermal management valve and pump-control faultsAirbag/SRS warning: diagnostics without owner disassemblyAfter repair: codes, monitors and inspection are differentWhy a Basic OBD Reader May Miss a LIN-Device FaultHow to Read OBD-II Codes Without Losing EvidenceHow to Save OBD Freeze-Frame DataCheck Engine Light Reset vs RepairTPMS Light On vs Flashing: What to CheckWhat to Tell Your Mechanic About a Warning LightEmissions Warranty: 8 Years or 80,000 Miles?Aftermarket Parts and Your New-Car WarrantyOBD Readiness Monitors and Emissions TestsCatalytic Converter Replacement and Emissions RulesRecall vs TSB vs Warranty: Key DifferencesHow to Choose a Repair Shop for a Warning LightCar A/C Refrigerant Repair and Technician CertificationUsed-Car Warning Lights to Check Before BuyingState Emissions Inspection Rules: Where to CheckDIY Car Diagnostic Guides and Owner ChecklistsP0420 After Replacing a Catalytic ConverterFlashing Check Engine Light Then Stops: Next StepsTPMS Light Flashing but Tires Look FineFord Wrench Light but No Codes on a Basic Scanner

Service Bulletins

25-017 Honda Service Document: Scope and Limits25-020 Honda Service Document: Scope and Limits24-EM-010H Hyundai Service Document: Scope and Limits24-01-086H-1 / 24V868 Hyundai Service Document: Scope and LimitsT-SB-0107-14 Toyota Service Document: Scope and LimitsSSM 53683 Ford Service Document: Scope and Limits25-2245 Ford Service Document: Scope and Limits25-2293 Ford Service Document: Scope and Limits18-NA-118 General Motors Service Document: Scope and Limits10-1-3 Ford Service Document: Scope and Limits09-80-21R Subaru Service Document: Scope and LimitsPI1803Y/Z revision 2 Kia Service Document: Scope and Limits09-128-24R Subaru Service Document: Scope and Limits18-NA-270 General Motors Service Document: Scope and Limits18-005-25 Stellantis Service Document: Scope and LimitsCar Service Bulletins: Research and VIN Limits

Community Cases

Owner Reports About Warning Lights and Codes

Tools

Generic emissions OBD reader: Capability and LimitsVehicle-specific enhanced scan tool: Capability and LimitsInspection light: Capability and LimitsTire-pressure gauge: Capability and LimitsTire inflator: Capability and LimitsTPMS activation/programming tool: Capability and LimitsLow-voltage battery/charging tester: Capability and LimitsOEM EV diagnostic interface: Capability and LimitsOBD Scanner and Test Tool CategoriesOBD Scanner Capability CheckerRepair Visit Checklist and Cost QuestionsOBD2 Scanners: Generic vs Enhanced CoverageBluetooth OBD2 Adapters: What to VerifyCar Battery Testers: What They Can Tell You

Parts

Spark plugs: What to Check Before BuyingIgnition coils: What to Check Before BuyingIntake ducting, seals and gaskets: What to Check Before BuyingEngine air filter: What to Check Before BuyingFuel-delivery components: What to Check Before BuyingMAF/MAP sensing components: What to Check Before BuyingEngine coolant: What to Check Before BuyingThermostat or housing: What to Check Before BuyingTemperature sensor: What to Check Before BuyingEngine oil and filter: What to Check Before BuyingVVT/timing components: What to Check Before BuyingOxygen / air-fuel sensors: What to Check Before BuyingCatalytic converter: What to Check Before BuyingExhaust seals and hardware: What to Check Before BuyingFuel cap: What to Check Before BuyingEVAP purge/vent components: What to Check Before BuyingEVAP hoses and seals: What to Check Before BuyingElectronic throttle/pedal components: What to Check Before BuyingKnock sensor: What to Check Before BuyingEngine internal parts: What to Check Before BuyingEGR components: What to Check Before BuyingTransmission/CVT fluid: What to Check Before BuyingTransmission components: What to Check Before BuyingWiring repair materials: What to Check Before BuyingControl module: What to Check Before BuyingBrake/ABS/EPB components: What to Check Before BuyingTPMS sensors: What to Check Before BuyingTires: What to Check Before BuyingLow-voltage auxiliary battery: What to Check Before BuyingAlternator/DC-DC charging components: What to Check Before BuyingADAS camera/radar components: What to Check Before BuyingHigh-voltage battery/ICCU/inverter parts: What to Check Before BuyingEV charging hardware: What to Check Before BuyingThermal control valve: What to Check Before BuyingVehicle control relay: What to Check Before BuyingSRS restraint components: What to Check Before BuyingCar Parts: Diagnose Before BuyingHistorical OEM Part Numbers in Service Documents: Fitment Not VerifiedEngine Air Filters: Fitment Before ReplacementGas Caps and EVAP Codes: Check Fit FirstOxygen Sensors: Diagnose Before ReplacementCar Part Fitment Evidence Checker

Symptoms

Car Won't Start: What to Check SafelyRough Idle: Causes and First ChecksCheck Engine Light After a Gas Cap ChangeReduced Engine Power or Limp Mode: First ResponseMultiple Warning Lights at Once: What They MeanEV Won't Charge: Safe First ChecksCar Symptoms and Dashboard Messages

Safety

Stop-Driving Warning Lights: When to Pull OverDIY vs Mechanic: Which Car Checks Are Safe?Hybrid and EV High-Voltage Warnings: Safety FirstCan I Drive? Symptom-First Safety Helper

Recalls

Check Open Car Recalls by VINNHTSA Model-Year Recall Research

Complaints

NHTSA Vehicle Complaints by Model Year

Vin Decoder

VIN Decode Assistant: NHTSA Vehicle Data

How It Works

How CarCodes Connects Warnings, Codes, and Sources

Editorial Standards

Editorial Standards and Safety Review

Affiliate Disclosure

Affiliate Disclosure

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Corrections

Corrections and Source Review

Privacy

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Terms

Terms of Use

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Data Sources

Data Sources and Research Limits

Warning Identifier

Warning Light Identifier: Narrow the Symbol

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Car Warning Lights and OBD-II Codes