What does code P1237 mean?

Q: What does code P1237 mean?

Fuel Pump Secondary Circuit Fault. P1237 on Ford vehicles indicates that the powertrain control module (PCM) has detected an abnormal condition in the secondary circuit of the fuel pump, which is the monitoring or feedback path separate from the main power feed to the pump. The PCM compares expected voltage or current on this circuit against actual values and sets the code when the signal falls outside the programmed range, often due to a wiring fault, a failing fuel pump driver module, or a problem inside the fuel pump assembly itself.

DTC codes / Ford codes / P1237

P1237 · FordFuel Pump Secondary Circuit Fault

P1237 on Ford vehicles indicates that the powertrain control module (PCM) has detected an abnormal condition in the secondary circuit of the fuel pump, which is the monitoring or feedback path separate from the main power feed to the pump. The PCM compares expected voltage or current on this circuit against actual values and sets the code when the signal falls outside the programmed range, often due to a wiring fault, a failing fuel pump driver module, or a problem inside the fuel pump assembly itself.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.