Error code

OBD2 P0253

OBD2P0253
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

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

Severity

moderateCan drive, but performance may be affected and symptoms can worsen over time.

Summary

P0253 indicates a low signal voltage issue with the fuel metering control sensor in the injection pump 'A' for diesel engines. This can affect fuel delivery and engine performance.

Symptoms

  • Hard or no starting
  • Excessive smoke from tailpipe
  • Rough idling or running
  • Poor acceleration and loss of power
  • Vehicle hesitation upon acceleration
  • Reduced fuel economy

Common Causes

  • Restricted flow to high pressure pump (clogged/dirty fuel filter, strainer)
  • Fuel contamination by bacteria/water/dissolved waxes
  • Defective or corroded wiring/connectors
  • Faulty fuel pressure sensor
  • Failed fuel control actuator
  • High pressure pump failure
  • Electric lift pump issues (if fitted)

Diagnosis

  1. Check fuel filter and strainer for blockages.
  2. Inspect fuel system for bacterial growth or contamination.
  3. Test electric lift pump (if fitted) for proper operation.
  4. Verify fuel shut-off solenoid function if present.
  5. Perform resistance, continuity checks on wiring and connectors.
  6. Test fuel pressure at the rail using a dedicated diesel gauge.

Fixes

  • Replace faulty components such as fuel filter, strainer, lift pump, or high-pressure pump.

FAQ

What causes P0253?

Common causes include restricted fuel flow to the high pressure pump due to clogged filters, contaminated fuel, and faulty electrical components like sensors or actuators.

How do I diagnose P0253?

Start by checking for blockages in the fuel system, inspecting wiring and connectors, testing electric lift pumps if present, verifying solenoid function, and measuring fuel pressure at the rail.

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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