The P0253 code indicates that the engine control module has detected a voltage signal from the fuel injection pump metering valve that is lower than the calibrated threshold. This suggests an electrical fault in the circuit that controls the volume of fuel delivered to the engine.
The internal solenoid or coil within the metering valve has failed or developed an internal short.
Frayed, broken, or chafed wires in the circuit leading to the injection pump causing an open circuit or short to ground.
Corrosion or moisture inside the electrical connector at the pump, resulting in high resistance or poor signal connectivity.
Internal mechanical failure of the injection pump that prevents the metering valve from operating within electrical specifications.
A failure in the driver circuit within the ECM that controls the metering valve voltage.
No. P0253 is an electrical circuit code. A clogged filter affects fuel pressure and flow but does not cause a low voltage signal in the metering control circuit.
No. It is highly uncommon for the ECM to be the cause of P0253. The issue is almost always found in the metering valve itself or the associated wiring.
Yes, many vehicles will enter a reduced-power limp mode or fail to start entirely to prevent engine damage due to unregulated fuel delivery.