OBD Code P0256

Injection Pump Fuel Metering Control “B” (Cam/Rotor/Injector)

What’s mean?

OBD2 Code P0256 Definition:
The ECM detects a discrepancy between the Pulse-Width Modulation (PWM) supplied to the Electronic Fuel Control Actuator (FCA) and the PWM returned from the Electronic Fuel Control Actuator (FCA).

Symptoms

Possible sumptoms of P0256
– Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

Possible causes of P0256
– Fuel Pump – FCA Driver Open – Return Circuit Open from FCA to ECM – FCA Driver Circuit Shorted to External Voltage – FCA Return Circuit Shorted to External V

Possible Solutions