Injection Pump Fuel Metering Control "B" Range/Performance (Cam/Rotor/Injector)
Your engine's fuel injection pump isn't delivering the right amount of fuel at the right time, like a water faucet that won't turn to the correct position. The ECU detected the pump's metering control is outside its normal operating range.
The ECU monitors the fuel injection pump's metering valve (cam/rotor position) through a feedback circuit to ensure proper fuel delivery volume. It compares actual pump response against expected parameters and flags a fault when the measured signal deviates beyond acceptable limits.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Metering valve position signal | Proportional voltage within 0.5-4.5V range | Signal out of range or stuck below 0.5V or above 4.5V |
| Pump response time | Valve responds within 50-200ms | Response slower than 200ms or erratic |
Code P0258 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0258 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.