P2371 indicates the powertrain control module (PCM) has detected the fuel volume control valve (regulator “B”) is not responding to commands within calibrated parameters, or the electrical circuit exhibits abnormal resistance or current flow. This typically affects the high-pressure fuel system’s ability to meter fuel entering the pump or rail, potentially causing pressure fluctuations.
The solenoid winding may be open or shorted internally, or the mechanical valve may stick due to wear or debris, preventing the PCM from achieving target fuel volume modulation.
Opens, shorts to ground or power, or high-resistance sections in the circuit between the PCM and the valve alter current draw and trigger a performance fault.
Poor terminal contact at the valve or inline connectors increases circuit resistance or causes intermittent signal loss, confusing the PCM’s monitoring logic.
Gelled fuel, water, or debris can mechanically bind the valve, causing sluggish movement that the PCM interprets as an electrical performance issue.
Rarely, the control module’s output circuit for the regulator fails to modulate voltage correctly; this should only be considered after verifying component integrity and wiring.
Performance indicates the circuit is electrically complete but operating outside expected parameters—such as slow valve response, incorrect current draw, or erratic feedback—whereas Low/High codes usually indicate a definitive short to ground or power, or an open circuit.
It is not recommended. The engine may enter limp mode or stall unexpectedly due to incorrect fuel metering, creating a safety hazard. Repairs should be completed before regular operation.
No. This code refers to the volume control valve that meters fuel entering the high-pressure pump or rail, not the low-pressure lift pump located in or near the tank.
Almost never. This code is caused by the regulator valve, wiring, or connector issues in the vast majority of cases. PCM replacement is only justified after exhaustive testing proves the module cannot output the proper control signal.