Error code

OBD2 P0255

OBD2P0255
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

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

Severity

moderateAvoid driving the car until the issue is resolved, as it poses a safety risk due to potential immobilization.

Summary

P0255 indicates an intermittent issue with the fuel metering control circuit 'A' in diesel vehicles, specifically related to wiring or components like the Fuel Rack Position (FRP) sensor and Fuel Quantity Actuator (FQA).

Symptoms

  • Stored trouble code and possibly an illuminated warning light
  • Hard starting conditions
  • Excessive smoke from tailpipe
  • Rough idling/running
  • Poor acceleration and loss of power
  • Vehicle hesitation upon acceleration
  • Increased fuel consumption

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

Diagnosis

  1. Check fuel filter and strainers for blockages.
  2. Inspect all wiring and connectors for damage or corrosion.
  3. Perform resistance, ground, continuity checks on associated wiring.
  4. Test the fuel shut-off solenoid if there is a no-start condition.
  5. If equipped with an electric lift pump, test its control circuit.

Fixes

  • Repair or replace damaged wiring and connectors.— $200-$300
  • Replace defective sensors (FRP/FQA).

FAQ

How serious is P0255?

The severity depends on the cause. Wiring issues or sensor failures are relatively easy to resolve, but mechanical failure of the injection pump is very serious.

What should I do if my car has this code?

Avoid driving until the issue is resolved due to safety risks. Consult a professional for diagnosis and repair.

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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