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OBDII/EOBD diagnostics trouble codes definition

If your car supports OBD II or EOBD, then you can already use almost 5000 generic OBDII codes. These codes are from PowerTrain series (P0XXX, P2XXX, P34XX), Body Series (B0XXX), Chassis series (C0XXX), Network series (U0XXX, U2XXX, U3XXX).

Also there is a list of more than 13500 additional manufacturer specific codes.

Supported manufacturers with specific OBD2 codes:


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Definition of check engine code P1503:

BMW:

Idle-Speed Control Valve Closing Solenoid Control Circuit Signal Low

Chrysler/Dodge/Jeep:

Speed Sensor Correlation

Citroen/Peugeot:

Auxillary Speed Sensor Fault

Daewoo:

ACCEL. SWITCH

Ford:

Auxillary Speed Sensor Fault

GM:

Theft Deterrent Fuel Enable Signal Not Received

Opel:

Immobilizer control module - incorrect signal

Volkswagen/Audi:

Load signal from Alternator Term. DF Range / performance / Incorrect Signal

Volvo:

Load signal from Alternator Term. DF Range / performance / Incorrect Signal