P1633 Diagnostic Trouble Code (8 interpretations)

The control module detected that the Keep Alive Power Voltage value was below the expected limit. This is the manufacturer-specific definition used by Ford.

The control module detected a fault associated with the Engine control module (ECM) circuit problem circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Honda.

The control module detected a fault associated with the Battery Overcharge 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 the fault condition "ECU internal fault" for the Engine ECU. Documented for the Bosch EDC16C34 injection ECU (DV6TED4 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The control module detected improper operation of the Engine control module (ECM) - throttle actuator control (TAC) system. This is the manufacturer-specific definition used by Toyota.

The control module detected that the Accelerator pedal position (APP) sensor 2 signal stayed below the expected range. This is the manufacturer-specific definition used by Audi.

The control module detected that the Accelerator Position Sensor 2 (G185) value was below the expected limit. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 18041. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).

The control module detected a fault associated with the CAN data bus, ABS (VSS signal) - not received in time circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volvo.