// OBD-II Code Decoder
Check engine code lookup
Enter any OBD-II diagnostic trouble code to get the full explanation, urgency rating, likely causes, and repair cost ranges. Works for P, B, C, and U codes.
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Most searched OBD codes
P0420Catalyst efficiency below thresholdP0300Random/multiple cylinder misfireP0128Coolant temp below thermostatP0171System too lean — Bank 1P0442EVAP small leak detectedP0455EVAP large leak detectedP0505Idle control system malfunctionC0035Left front wheel speed sensorU0100Lost communication with ECM/PCMP0301Cylinder 1 misfire detected
What is an OBD-II code?
OBD-II (On-Board Diagnostics, second generation) is a standardized system in all vehicles sold in the United States after 1996. When your vehicle's computer detects an issue, it stores a Diagnostic Trouble Code (DTC) and illuminates the check engine light. MyOBDCode lets you look up these codes instantly — for free.
Code categories
- PPowertrainEngine, transmission, fuel system
- BBodyAirbags, HVAC, power accessories
- CChassisABS, traction control, suspension
- UNetworkCAN bus, module communication