Possible causes

– Faulty Fuel Pump Drive Module (FPDM)
– FPDM harness is open or shorted
– FPDM circuit poor electrical connection
– Faulty Powertrain Control Module (PCM)

Tech notes

Note: For LS6/LS8 and Thunderbird, the FPDM functions are incorporated in the Rear Electronics Module (REM). Also, the REM does not use an FPM circuit. Diagnostic information is sent on the communication link.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1235 FORD Description

The P1235 code indicates the Fuel Pump Drive Module (FPDM) detected an invalid or missing Fuel Pump (FP) circuit signal from the Powertrain Control Module (PCM). The FPDM sends a message to the PCM through the FPM circuit, indicating this failure was detected. The PCM sets the DTC when the message is received.

FORD Technical Service Bulletins for P1235 code