Injection Pump Fuel Metering Control A Low
The P0253 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the fuel metering control circuit (often associated with the injection pump's rotor or cam position sensor). This typically means the fuel metering actuator or its circuit is malfunctioning, causing insufficient fuel delivery or incorrect timing. The issue can stem from a faulty fuel metering solenoid, wiring problems, or a failing injection pump.
1. Most Common Causes
- Short to ground in the fuel metering control circuit wiring
- Open circuit or excessive resistance in the injection pump actuator wiring
- Internal failure of the injection pump fuel metering control actuator
- Corroded or loose connections at the injection pump connector
- Injection pump failure (mechanical wear of rotary plunger or internal components)
- Faulty ECM/PCM (less common)
2. Symptoms You Will Notice
- Engine hard to start or no start
- Loss of power and poor acceleration
- Engine stalling or rough idle
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the fuel metering solenoid resistance with a multimeter (compare to specs).
Step 4: Check voltage and ground at the solenoid connector with key on.
Step 5: If wiring and solenoid are good, suspect internal injection pump failure.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or lose power unexpectedly, leading to a potential accident. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
Costs vary widely: replacing a fuel metering solenoid can be $200-$400, while a full injection pump replacement can range from $800-$2000 or more, including labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.