Possible causes

– Open or shorted FP PWR circuit
– Open FP RTN circuit to FPDM
– Open or shorted circuit in the fuel pump
– Locked fuel pump rotor
– Damaged FPDM

Symptoms

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

P1237 Description

The DTC indicates the FPDM detected a fuel pump secondary circuit fault. 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.

P1237 Information for specific makes

P1237 BUICK
P1237 CADILLAC
P1237 CHEVROLET
P1237 FORD
P1237 GMC
P1237 MERCURY