The P0258 code indicates that the engine control module has detected a voltage signal below the normal range for the fuel metering control valve 'B'. This typically points to an electrical open circuit or a short to ground in the valve's control circuit.
The internal solenoid of the metering valve has failed or shorted internally, causing a low voltage reading.
Frayed, rubbed, or broken wires in the circuit are causing a short to ground or a break in the signal.
Moisture or debris in the electrical connector has created high resistance or a poor connection at the valve.
A failure in the power supply circuit providing voltage to the metering valve.
An internal failure in the ECM's driver circuit for the metering valve, though this is rare.
It is unlikely. P0258 is usually caused by a failed valve or wiring issues; the ECM should only be replaced after all wiring and the valve itself have been thoroughly tested and ruled out.
No. P0258 is an electrical circuit code regarding the control valve's voltage, not a mechanical pressure or flow restriction code.
The vehicle may experience sudden stalling or severe power loss, which can be dangerous in traffic. It is recommended to diagnose the issue immediately.