P1237 FORD, LINCOLN, MERCURY: FUEL PUMP SECONDARY CIRCUIT FAULT
POST UPDATED IN January, 2023
P1237 FORD, LINCOLN, MERCURY: FUEL PUMP SECONDARY CIRCUIT FAULT
The fuel pump is an essential component of the engine combustion system. This device, located in the fuel tank, is designed to transport the necessary amount of fuel from the fuel tank to the engine at the proper pressure.
Older vehicles had mechanical pumps, which are driven by the camshaft or distributor shaft. More modern models of vehicles with fuel injection systems include electric pumps. These pumps deliver fuel to the injectors at a defined pressure.
The FPDM (Fuel Pump Driver Module) controls the voltage of the fuel pump, in order to maintain the pressure within the appropriate levels for proper engine performance. If this module detects a fault in the secondary circuit of the fuel pump, it will communicate it to the Powertrain Control Module (PCM), which will store the fault code P1237 OBD2.
P1237 OBDII diagnostic code is set for one of the following reasons:
To troubleshoot DTC P1237 OBD2 consider the following: