P1640 Diagnostic Trouble Code (9 interpretations)

The control module registered the fault condition described as "Internal Control Module ROM RAM Error". This is the manufacturer-specific definition used by BMW.

The control module detected a fault associated with the Powertrain DTCs Available in Another Module circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Ford.

The control module detected that the Motor torque signal signal stayed below the expected range. This is the manufacturer-specific definition used by Honda.

The control module detected that the Engine control relay voltage stayed below the expected range. This is the manufacturer-specific definition used by Kia.

The control module detected improper operation of the Engine control module (ECM), MIL/RPM / fuel consumption signal(s) circuit. This is the manufacturer-specific definition used by Opel.

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

The control module detected the fault condition "Excessive operating temperature" for the Injection system supply relay circuit (power stage). 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's internal test reported the Engine control module (ECM) as faulty. This is the manufacturer-specific definition used by Audi.

The control module registered the fault condition described as "Internal Control Module: EEPROM Error". This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 18048. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).