Injection Pump Fuel Metering Control B Low
Code P0258 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the fuel metering control circuit B of the injection pump. This circuit is responsible for regulating the amount of fuel delivered to the injectors. A low signal can result from a faulty fuel metering actuator, wiring issues, or internal pump problems, leading to improper fuel delivery and engine performance issues.
01. Most Common Causes
- Faulty fuel metering actuator (fuel control solenoid)
- Open or shorted wiring in the metering control circuit
- Failed injection pump (internal mechanical or electrical failure)
- Corroded or loose electrical connectors at the pump
02. 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
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm code P0258 and check for related codes.
Step 2: Visually inspect the injection pump wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the fuel metering actuator resistance and voltage supply per manufacturer specifications.
Step 4: If wiring and actuator are okay, perform a fuel pressure test to assess pump performance.
Step 5: Replace the fuel metering actuator or injection pump as needed, then clear codes and test drive.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. Driving with P0258 can cause poor engine performance, stalling, or no start, which may lead to a breakdown or accident.
How much does it cost to fix?▼
Repair costs range from $200 to $800 depending on the cause. Replacing a fuel metering actuator is cheaper, while a full injection pump replacement is more expensive.