P0258
UniversalInjection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)
The engine computer has detected a low condition in the Injection Pump Fuel Metering Control B system. This system helps regulate fuel delivery, so the fault may affect starting, engine performance, or whether the engine keeps running. The code identifies a detected condition; it does not by itself prove that the injection pump or another specific part has failed. Exact operation and diagnostic steps depend on the vehicle's model, year, and engine.
⚠️ Before You Begin (Safety First)
If the engine stalls, loses power severely, or is difficult to keep running, stop in a safe place and arrange diagnosis rather than continuing to drive in traffic. If you notice fuel leaking, do not drive the vehicle; have it inspected. Do not loosen or disconnect fuel-injection lines, which may contain fuel under high pressure.
Common Symptoms
- The engine may crank longer than usual or have difficulty starting if fuel metering is affected.
- The engine may run roughly or produce less power if fuel delivery is not being controlled as expected.
- The engine may stall or fail to keep running if the condition significantly disrupts fuel metering.
- The check-engine light may be on.
- There may be no noticeable symptoms if the detected condition is intermittent or does not significantly affect engine operation.
Common Causes
- Damaged, loose, or corroded wiring or connectors in the fuel metering control B circuit.
- A power, ground, or control-signal problem affecting the metering system.
- A fault in the fuel metering control component or its related feedback circuitry.
- A problem involving the injection pump or associated cam, rotor, or injector components.
- An intermittent electrical connection or another vehicle-specific control-system fault.
Diagnostic Steps
- Note whether the engine is hard to start, running roughly, losing power, or stalling; these details can help guide diagnosis.
- With the engine off and cool, visually inspect accessible wiring and connectors related to the injection-pump metering system for looseness, corrosion, chafing, or visible damage.
- Look for visible fuel leaks without touching or loosening fuel lines. If a leak is present, do not drive the vehicle and seek professional service.
- If you have a scan tool, record the code and any related codes before clearing anything; related codes may help identify a shared wiring or control issue.
- If the code returns or symptoms are present, arrange vehicle-specific diagnosis. Do not replace the pump or open high-pressure fuel components based on this code alone.
When to Call a Professional
A technician can use vehicle-specific service information and scan data to confirm the fault, then inspect the relevant wiring, connections, power and grounds, and control signals. Testing should distinguish a wiring or connector problem from a fault in the metering control, injection pump, or related cam, rotor, or injector components. Verify the repair using the applicable service procedure.
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Commonly Asked Questions
Does P0258 mean the injection pump must be replaced?
No. The code reports a low condition in the Injection Pump Fuel Metering Control B system. Wiring, connectors, power or ground, control components, and related pump, cam, rotor, or injector parts may need investigation before any part is replaced.
What does “Low” mean in this code?
It describes the detected low condition for the control system. The exact signal or circuit interpretation depends on the vehicle's design and service information; it does not identify a failed part by itself.
Can I drive with P0258?
If the vehicle runs normally, a cautious trip for diagnosis may be possible, but avoid driving if it stalls, loses substantial power, or is difficult to keep running. Do not drive if fuel is leaking.
Could a wiring problem cause this code?
Yes. A damaged, loose, or corroded connection, or a power, ground, or signal issue, can affect fuel metering control. Inspection and vehicle-specific testing help distinguish these possibilities from a component fault.
Related Diagnostic Video
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