Fault code P0253 – a step-by-step guide to diagnosing and fixing it

Error code P0253 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected an error in the injection pump fuel metering. This DTC P0253 refers to a malfunction in the fuel system, specifically in the metering control of the injection pump. For various manufacturers, this trouble code can also be referred to as "Injection Pump Fuel Metering Control 'A' Malfunction".

What causes can this error code have?

• Defective injection pump
• Damaged fuel lines
• Clogged fuel filter
• Defective fuel pressure sensor
• Faulty fuel metering valves
• Loose or corroded plug connections
• Defective engine control unit (ECU)
• Dirty or defective fuel pressure regulator
• Electrical problems in the wiring

What symptoms occur in parallel with fault code P0253?

• Starting problems: The vehicle is difficult to start or does not start at all. Loss of power: Significantly reduced engine power, especially under load. Uneven idling: Engine runs unevenly at idle or stutters. Increased fuel consumption: Noticeable increase in diesel consumption during normal driving. Black smoke: Dark exhaust fumes from the exhaust, especially when accelerating. Jerky ride: The vehicle jerks while driving or accelerating.

How to fix the problem of fault code P0253?

• Repairing fault code P0253 requires a systematic approach to identify the exact cause.
• Change the fuel filter and flush the fuel system to remove any impurities that may affect the metering
• Replace the injection pump completely if it is defective - one of the most frequent and cost-intensive repairs for this EOBD code
• Check fuel pressure sensor and replace if necessary to ensure correct pressure values for metering control
• Check all electrical connections and cables to the injection pump for damage and repair them
• Clean or replace fuel metering valves if they are stuck or defective
• Diagnose the engine control unit and reprogram or replace if necessary