OBD-II trouble codes

Ranked by how often the code appears in real NHTSA owner complaints - not alphabetically. P = powertrain, B = body, C = chassis, U = network.

Browse by symptom

Rough idle / shaking Stalling Hard starting Hesitation / power loss Flashing check engine light Poor fuel economy Shifting problems Temperature / cooling ABS / dashboard lights

Codes whose typical symptoms include flashing check engine light - most serious first:

P0300Random/Multiple Cylinder Misfire Detected P0301Cylinder 1 Misfire Detected P0351Ignition Coil A Primary Control Circuit/Open