P1656 Diagnostic Trouble Code (10 interpretations)

The control module detected improper operation of the 5V Reference circuit. This is the manufacturer-specific definition used by Dodge.

The control module detected a fault associated with the CAN Link PCM Circuit Network 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 improper operation of the CAN data bus circuit. This is the manufacturer-specific definition used by Mazda.

The control module detected a fault associated with the Coolant Shutoff Valve 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 a short circuit to ground in the Engine status signal fault circuit. 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 expected Engine status signal fault was absent. 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 control module detected a short circuit to ground in the Engine running status information line circuit. Documented for the Continental SID 807 injection ECU (DV6C 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The control module detected a short circuit to ground in the Engine running information circuit. Documented for the Magneti Marelli MM6KP engine ECU (EW7A/EW10A) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The control module detected a short circuit to ground in the AC signal circuit. This is the manufacturer-specific definition used by Audi.

The control module detected that the Camshaft position (CMP) actuator, exhaust signal stayed above the expected range. This is the manufacturer-specific definition used by Volvo.