Free OBD-II Code Lookup

OBD-II Fault Code Lookup

1,829 fault codes with symptoms, causes, solutions and repair costs

P
Powertrain
Engine, transmission and emission system
1345 codes
B
Body
Doors, windows, A/C, lighting
201 codes
C
Chassis
Brakes, ABS, ESP, suspension
146 codes
U
Network
CAN bus, ECU communication
137 codes

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Most Common Fault Codes

FAQ

What is an OBD-II fault code?
OBD-II (On-Board Diagnostics II) is a vehicle diagnostic system that identifies issues in engine, transmission, emission and other systems using codes starting with P, B, C, or U.
How can I read fault codes?
You can read fault codes using an OBD-II scanner or Bluetooth adapter (like ELM327) connected to your vehicle's OBD port, usually located under the steering wheel.
What if the code comes back after clearing?
A returning code means the underlying issue hasn't been fixed. Clearing codes only temporarily removes the warning. We recommend visiting a mechanic.
What do P, B, C, U codes mean?
P = Powertrain (engine & transmission), B = Body (comfort systems), C = Chassis (brakes, ABS), U = Network (CAN bus communication).