P1237 MERCURY Possible Causes
- Faulty Fuel Pump Driver Module (FPDM)
- Fuel Pump Driver Module (FPDM) harness is open or shorted
- Poor electrical connection in the Fuel Pump Driver Module (FPDM) circuit
- Faulty fuel pump
How to Fix Code P1237 MERCURY?
Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
The Fuel Pump Driver Module detected a fault in the fuel pump secondary circuit
Possible Symptoms
- Engine Light On (or Service Engine Soon Warning Light)
- Engine does not start
P1237 MERCURY Meaning
Fuel Pump Driver Modules (FPDM) control the fuel pump voltage to maintain proper fuel pressure throughout the engine’s operating range. Code P1237 indicates that the FPDM has detected a fuel pump secondary circuit issue. The FPDM sends a message to the Powertrain Control Module (PCM) via the Fuel Pump Monitor (FPM) circuit indicating that this problem has been detected. The PCM sets the DTC when the message is received.