P1674 Diagnostic Trouble Code (9 interpretations)

The control module detected improper operation of the Tachometer circuit. This is the manufacturer-specific definition used by Chevrolet.

The control module detected a fault associated with the Control Module Software Corrupted 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 a fault associated with the Immobilizer signal - no valid code received circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Land Rover.

The control module detected improper operation of the Engine control module (ECM). This is the manufacturer-specific definition used by Mazda.

The control module detected that the Controlled alternator fault was above its expected limit. Documented for the Bosch MED 17.4.x engine ECU (EP6 THP family) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The control module detected that the Controlled alternator fault was above its expected limit. Documented for the Bosch MEV17.4 engine ECU (EP6 1.6 VTi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The stored code identifies a fault of the Piloted Alternator mechanics. Documented for the Magneti Marelli MM6KP engine ECU (EW7A/EW10A) on Peugeot applications; the same PSA control units are also fitted to Citroën models. PSA documentation does not characterise the failure mode further.

The control module detected that the CAN data bus, instrumentation state or value did not match what was expected. This is the manufacturer-specific definition used by Audi.

The control module detected that the CAN data bus, instrumentation state or value did not match what was expected. This is the manufacturer-specific definition used by Volkswagen.