P1503 Diagnostic Trouble Code (7 interpretations)

The control module detected that the Theft Deterrent System Password state or value did not match what was expected. This is the manufacturer-specific definition used by Chrysler.

The control module detected a fault associated with the Cruise Control Malfunction - Control Switch circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Hyundai.

The control module detected improper operation of the Cruise control master switch. This is the manufacturer-specific definition used by Kia.

The control module detected that the Idle Speed Control Valve Closing Solenoid Control signal stayed below the expected range. This is the manufacturer-specific definition used by MINI.

The control module detected that the Immobilizer control module state or value did not match what was expected. This is the manufacturer-specific definition used by Opel.

The control module detected a fault associated with the Alternator load signal circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Audi.

The control module judged the Load signal from Alternator Term. DF behaviour implausible for the current operating conditions. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 17911. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).