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 hard starting - most serious first:

P0016Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A P0320Ignition/Distributor Engine Speed Input Circuit P0335Crankshaft Position Sensor A Circuit P0340Camshaft Position Sensor A Circuit Bank 1 or Single Sensor P0606Control Module Processor P0705Transmission Range Sensor A Circuit (PRNDL Input)U0140Lost Communication With Body Control Module P0012A Camshaft Position - Timing Over-Retarded Bank 1 P0022A Camshaft Position - Timing Over-Retarded Bank 2 P0101Mass or Volume Air Flow Sensor A Circuit Range/Performance P0102Mass or Volume Air Flow Sensor A Circuit Low P0107Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low P0118Engine Coolant Temperature Sensor 1 Circuit High P0341Camshaft Position Sensor A Circuit Range/Performance Bank 1 or Single Sensor P0345Camshaft Position Sensor A Circuit Bank 2 P0602Control Module Programming Error P0685ECM/PCM Power Relay Control Circuit/Open P0496EVAP System High Purge Flow