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OBD-II code library

What is your check engine light trying to tell you?

Type the code your scanner read, just as it shows on the screen. You get what it means in plain English, what usually causes it, how to fix it and whether it is safe to keep driving.

12434codes
4systems: P, C, B, U
16manufacturers
AV·SCANDTC-500 · OBD-II / EOBD
LINK OK · READ CODES12.6V
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Trending lookups

P0420Catalyst System Efficiency Below Threshold (Bank 1)P0011'A' Camshaft Position - Timing Over-Advanced or System Pe…P0300Random/Multiple Cylinder Misfire DetectedP0442EVAP System Leak Detected (Small)P0457Evaporative Emission System Leak Detected (fuel cap loose…P1304EGR Calibration HighP0174System Too Lean (Bank 2)P1637Throttle Valve Position Control Control Deviation

Most common codes

P0420Catalyst System Efficiency Below Threshold (Bank 1) P0300Random/Multiple Cylinder Misfire Detected P0171System Too Lean (Bank 1) P0174System Too Lean (Bank 2) P0128Coolant Thermostat (Coolant Temperature Below Thermostat … P0442EVAP System Leak Detected (Small) P0455EVAP System Leak Detected (Large) P0401EGR Flow Insufficient Detected P0101Mass/Volume Air Flow Circuit Range/Performance P0113Intake Air Temperature Circuit High Input P0301Cylinder 1 Misfire Detected P0340Camshaft Position Sensor A Circuit Malfunction (Bank 1) P0335Crankshaft Position Sensor A Circuit Malfunction P0500Vehicle Speed Sensor Malfunction P0700Transmission Control System Malfunction P0507Idle Control System RPM Higher Than Expected P0011'A' Camshaft Position - Timing Over-Advanced or System Pe… P0016Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A) P0135O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) P0456Evaporative Emission System Leak Detected (very small lea… P0430Catalyst System Efficiency Below Threshold (Bank 2) P0302Cylinder 2 Misfire Detected P2096Post Catalyst Fuel Trim System Too Lean (Bank 1) U0100Lost Communication With ECM/PCM A

Browse by system

P

Powertrain 7337 codes

Engine, transmission and emissions

P00xxFuel and air metering and auxiliary emission controls255 codesP01xxFuel and air metering256 codesP02xxFuel and air metering (injector circuits)254 codesP03xxIgnition system and misfire252 codesP04xxAuxiliary emission controls250 codesP05xxVehicle speed, idle control and auxiliary inputs256 codesP06xxComputer and output circuits256 codesP07xxTransmission256 codesP08xxTransmission234 codesP09xxTransmission147 codesP0AxxHybrid propulsion256 codesP0BxxHybrid propulsion256 codesP0CxxHybrid propulsion256 codesP0DxxHybrid propulsion255 codesP0ExxHybrid propulsion255 codesP0FxxHybrid propulsion1 codesP20xxFuel and air metering and auxiliary emission controls256 codesP21xxFuel and air metering256 codesP22xxFuel and air metering (injector circuits)256 codesP23xxIgnition system and misfire255 codesP24xxAuxiliary emission controls253 codesP25xxVehicle speed, idle control and auxiliary inputs256 codesP26xxComputer and output circuits256 codesP27xxTransmission242 codesP28xxTransmission245 codesP2AxxHybrid propulsion256 codesP2BxxHybrid propulsion254 codesP2CxxHybrid propulsion256 codesP2DxxHybrid propulsion254 codesP2ExxHybrid propulsion192 codesP34xxAuxiliary emission controls155 codes
C

Chassis 619 codes

Brakes, steering and suspension

C00xx114 codesC01xx21 codesC02xx35 codesC03xx18 codesC04xx15 codesC05xx254 codesC06xx115 codesC07xx13 codesC08xx18 codesC09xx16 codes
B

Body 322 codes

Airbags, seats, doors, lights and comfort systems

B00xx152 codesB01xx75 codesB02xx32 codesB03xx14 codesB04xx7 codesB05xx17 codesB06xx3 codesB07xx2 codesB08xx12 codesB09xx8 codes
U

Network 1229 codes

Communication between the vehicle's control modules

U00xxNetwork wiring and bus faults116 codesU01xxLost communication with a control module182 codesU02xxLost communication with a control module174 codesU03xxSoftware and configuration mismatches80 codesU04xxInvalid data received from a module181 codesU05xxNetwork communication161 codesU06xxNetwork communication160 codesU09xxNetwork communication1 codesU30xxNetwork wiring and bus faults55 codesU35xxNetwork communication119 codes

Manufacturer codes

Codes with a 1 in second place (P1xxx, B1xxx…) are defined by each manufacturer, so the same number can mean different things on a Ford and a Toyota. Pick your make.

Audi2 codesBMW250 codesChrysler331 codesFord413 codesGM464 codesHonda94 codesJaguar163 codesKia76 codesMazda233 codesMercedes-Benz32 codesMitsubishi33 codesNissan139 codesSubaru93 codesSuzuki17 codesToyota59 codesVolkswagen528 codes

Every code, in one list

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New to trouble codes?

Pending, stored and permanent codes, freeze frame data, and when clearing codes does more harm than good.

Read the guide

Code definitions follow SAE J2012 and draw on the open-source python-OBD, dtc-lookup, OBDex and dtc-database projects, cross-checked against each other. Symptoms, causes and fixes are general guidance; always confirm a fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage