Error code

OBD2 P0251

OBD2P0251
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Injection Pump Fuel Metering Control 'A' (Cam/Rotor/Injector).

Severity

highDriving may be possible but could cause further damage and should not be prolonged.

Summary

P0251 indicates an issue with the fuel metering control circuit 'A' in the injection pump of diesel engines, specifically related to the rotor/cam or similar components involved in controlling fuel pressure and volume.

Common Causes

  • Damaged, shorted, disconnected, or corroded wiring and/or connectors
  • Defective Fuel Rack Position (FRP) sensor
  • Defective Fuel Quantity Actuator (FQA)
  • Failed or failing PCM

Fixes

FAQ

What does P0251 mean?

P0251 indicates a malfunction in the fuel metering control circuit 'A' of the injection pump, which is crucial for managing fuel pressure and volume in diesel engines.

Where is the sensor located?

The Fuel Rack Position (FRP) sensor and Fuel Quantity Actuator (FQA) are typically mounted alongside or inside the high-pressure injection pump. Refer to your vehicle's manual for exact locations.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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