P0258Injection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- These codes cover the electrically controlled fuel metering actuator on a diesel injection pump – on common rail usually an inlet metering valve on the high-pressure pump that sets how much fuel is compressed. P0258 means the actuator B circuit reads low. The only manufacturer found, Saab with its 3.0 V6 diesel of the early 2000s, uses it not for a second valve but for the shared supply of both metering valves: a short to ground or open for more than about 1 s triggers limp mode with limited pedal response and injection quantity, rail pressure capped at 60 MPa and idle raised to 1,000 rpm; the warning light comes on if it recurs on the next trip.
- What you may notice
- Check engine light on (after the second trip)
- Loss of power, limp mode
- Raised idle speed in limp mode
- Likely causes
- LikelySupply wire, fuse or relay of the metering valves open or shorted to ground
- PossibleConnector at the pump corroded or loose
- PossibleMetering valve shorted to ground internally
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.