Damaged or corroded wiring harness or connector at the injection pump metering control solenoid; Failed fuel metering control solenoid or actuator on the injection pump; Open circuit or high resistance in the control circuit between the PCM and the pump; Short to ground in the control wire, often from chafing against engine components; Faulty powertrain control module (PCM) driver circuit, though rare; Internal mechanical binding in the injection pump cam ring or rotor affecting solenoid operation; Contaminated fuel or debris causing solenoid valve sticking and low feedback signal

DTC codes / P02xx · Fuel and air metering (injector circuits) / P0258

P0258Injection Pump Fuel Metering Control 'B' Low (Cam/Rotor/Injector)

P0258 indicates that the powertrain control module (PCM) has detected a low voltage condition on the fuel metering control circuit for injection pump output 'B', which is often associated with the cam ring, rotor, or injector timing components. The PCM monitors this circuit for expected electrical feedback and sets the code when the signal falls below the calibrated threshold, indicating an open circuit, short to ground, or a faulty actuator.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or engine misfire, particularly when cold or under light load
Reduced engine power or limp mode due to fuel delivery miscalculation
Hard starting or extended cranking before the engine fires
Poor fuel economy or increased exhaust smoke
Intermittent hesitation or stumble during acceleration

Common causes, most likely first

Damaged or corroded wiring harness or connector at the injection pump metering control solenoid
Failed fuel metering control solenoid or actuator on the injection pump
Open circuit or high resistance in the control circuit between the PCM and the pump
Short to ground in the control wire, often from chafing against engine components
Faulty powertrain control module (PCM) driver circuit, though rare
Internal mechanical binding in the injection pump cam ring or rotor affecting solenoid operation
Contaminated fuel or debris causing solenoid valve sticking and low feedback signal

How to diagnose and fix it

Inspect the injection pump electrical connector and harness for corrosion, chafing, or loose pins, and repair as needed
Measure resistance of the fuel metering control solenoid and compare to manufacturer specification
Check for short to ground or open circuit in the control wire between the PCM and the pump using a multimeter
Verify power and ground supplies to the injection pump control circuit with the key on and engine cranking
Perform a bidirectional scan tool test of the fuel metering actuator to confirm solenoid response
If electrical checks pass, test fuel pressure and inspect for mechanical binding in the pump cam ring or rotor
Replace the faulty fuel metering solenoid or injection pump assembly if internal failure is confirmed, then clear codes and verify repair

Before you replace the injection pump

A loose or corroded connector at the pump is a far more common cause than a failed pump, so always wiggle-test the harness while watching live data.
The code can set intermittently from vibration-related wire chafing, so a static resistance check may pass while the fault only appears during driving.
Low fuel pressure from a restricted filter or weak lift pump can mimic a metering control fault by causing the solenoid to draw abnormal current.
Some scan tools show fuel metering control 'B' as a separate parameter from 'A', and misreading the live data can lead to replacing the wrong component.
After repairs, a relearn or adaptation reset may be required for the PCM to accept the new metering control values and turn off the light.

Can I keep driving with P0258?

The vehicle may enter limp mode or suffer reduced power, so avoid sustained high-speed driving or heavy towing until the fault is repaired. Short trips to a repair shop are acceptable if the engine runs smoothly, but stop driving immediately if rough running or stalling occurs.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.