P0252: Injection Pump Fuel Metering Control A Range/Performance
The P0252 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the fuel metering control circuit 'A' in the injection pump. This typically involves the cam, rotor, or injector position sensor within the pump. The ECM monitors the fuel metering solenoid or actuator and compares the commanded position to the actual position. If the difference exceeds a threshold, this code sets. Common causes include a faulty fuel metering actuator, wiring issues, or internal pump wear.
1. Most Common Causes
- Faulty fuel metering actuator or solenoid
- Wiring or connector issues in the metering control circuit
- Internal injection pump wear or damage
- ECM software or hardware failure
2. Symptoms You Will Notice
- Engine hesitation or surging
- Hard starting or no start
- Reduced power and poor fuel economy
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect wiring and connectors for damage or corrosion.
Step 3: Test the fuel metering actuator resistance and voltage supply per manufacturer specs.
Step 4: Perform a fuel pressure test to verify pump output.
Step 5: If all else fails, replace the injection pump.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor performance, stalling, or no start. Immediate diagnosis is advised.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If the injection pump needs replacement, costs can range from $800 to $2,500 depending on the vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.