Powertrain, generic · Fuel and air metering (injector circuit)

P0258 Injection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Supply wire, fuse or relay of the metering valves open or shorted to ground
Connector at the pump corroded or loose
Metering valve shorted to ground internally
Engine module

Symptoms

  • Check engine light on (after the second trip)
  • Loss of power, limp mode
  • Raised idle speed in limp mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel metering actuator bhigh pressure fuel pumpactuator wiringmetering valve supply

Related codes

P0253P0256P0257P0259

References: law.cornell.edu, saabwisonline.com, saabwisonline.com.