P1843 Diagnostic Trouble Code (5 interpretations)

The control module detected that the signal in the 1 - 2 Shift Solenoid circuit stayed above the expected operating range. This is the manufacturer-specific definition used by Chevrolet.

The control module detected a fault associated with the Automatic Transmission Fluid Pressure Switch 3 circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Nissan.

The control module detected that the Engine coolant temperature (ECT) sensor value was outside the valid range. This is the manufacturer-specific definition used by Opel.

The stored code identifies a fault of the Gearbox external fault during the restarting phase. Documented for the MCP 6-speed piloted manual gearbox ECU 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 a fault associated with the Check DTC Memory Of Distance Control ECU circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Volkswagen.