P0258
UniversalInjection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)
Medium SeverityThe P0258 code indicates that the Powertrain Control Module (PCM) has detected a low voltage signal from the fuel metering control circuit 'B', which regulates fuel delivery to the engine. This typically results in poor engine performance, reduced fuel economy, and potential issues with starting or acceleration.
⚠️ Before You Begin (Safety First)
Always exercise extreme caution when working with fuel systems, as fuel is highly flammable. Disconnect the battery before attempting any repairs. Allow the engine to cool before working on hot components. Wear appropriate eye and hand protection.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or sluggish acceleration
- Poor fuel economy
- Engine may stall or hesitate
- Rough idling
- Hard starting
- Excessive black smoke from exhaust (in diesel engines)
Common Causes
- Faulty fuel metering control valve (e.g., sticking or electrical fault)
- Wiring harness issue (open, short, or poor connection) in the fuel metering control circuit
- Failed or corroded connector to the fuel metering control valve
- Issues with the injection pump's internal metering components
- Faulty Powertrain Control Module (PCM) (less common)
- Contaminated fuel system components
Frequently reported on: Ford F-Series Diesel (2003-2010), Ram 2500/3500 Cummins (2007-2012), Chevrolet Silverado/GMC Sierra Duramax (2001-2007), Volkswagen Jetta TDI (2004-2009), Sprinter Vans (2006-2018)
Diagnostic Steps
- Visually inspect the wiring and connectors associated with the fuel injection pump and the fuel metering control valve for any obvious damage, corrosion, or loose connections.
- Check for proper voltage and ground at the fuel metering control valve connector using a multimeter, referring to your vehicle's specific wiring diagram.
- Use an OBD-II scan tool to monitor live data from the fuel metering control valve to see if it responds to commands or shows erratic readings.
- If accessible, try cleaning the fuel metering control valve, though replacement is often necessary if it's faulty.
- Test for proper fuel pressure if you suspect a broader fuel system issue.
👨🔧 When to Call a Professional
If after basic visual inspections you cannot identify the fault, or if you suspect issues with the injection pump itself or high-pressure fuel lines, it is best to consult a professional mechanic. These systems require specialized tools and knowledge to repair safely.
Commonly Asked Questions
What does "Fuel Metering Control B Low" mean?
It means the engine computer (PCM) has detected a voltage signal that is lower than expected from the circuit controlling how much fuel is delivered by the injection pump to the engine.
Can I drive with a P0258 code?
While your vehicle might still run, it's not recommended to drive for long with this code. It can lead to reduced power, poor fuel economy, and potentially more severe engine or fuel system damage over time.
Is the fuel metering control valve the same as the fuel pressure regulator?
They are related but distinct. The fuel metering control valve primarily controls the amount of fuel supplied to the high-pressure pump, while the fuel pressure regulator typically controls the pressure within the fuel rail.
How much does it cost to fix a P0258 code?
The cost can vary significantly. If it's a simple wiring fix, it might be minimal. If the fuel metering control valve needs replacement, parts can range from $100-$500, plus labor. If the injection pump itself is the issue, costs can be much higher, potentially $1000-$3000+.
What tools do I need to diagnose P0258?
You'll need an OBD-II scan tool to read codes and live data, a multimeter for electrical checks, and potentially a fuel pressure gauge. A service manual for your specific vehicle is also highly recommended.