OBD-II code P2372 indicates that the engine control module has detected a low voltage condition in the control circuit for the "B" fuel volume regulator. This typically points to an electrical issue, such as a short to ground or a failed regulator, rather than a mechanical fuel pressure problem.
Chafed, melted, or damaged wiring in the regulator control circuit can cause the voltage to drop to near zero, triggering the low circuit code.
The internal solenoid of the regulator can short out internally, pulling the control circuit voltage down.
High resistance or a poor connection at the regulator plug can cause the circuit voltage to read lower than expected.
A broken wire or disconnected terminal prevents the regulator from operating, and the PCM may interpret the lack of voltage return as a low circuit condition.
Rarely, an internal failure in the PCM can prevent it from supplying proper voltage to the control circuit.
Not directly. This code refers specifically to the electrical control circuit for the fuel volume regulator, meaning the computer cannot properly control the regulator due to a low voltage issue, not necessarily that fuel pressure is currently low.
It is generally not recommended. The fuel system may not be able to regulate pressure correctly, which can lead to stalling, poor performance, or potential engine damage over time.
Almost never. Drivers are frequently told to replace the PCM for P2372, but that is usually wrong. A low circuit condition is almost always caused by a shorted wire, a failed regulator solenoid, or a bad connection. The PCM is the least likely cause.
You can test the regulator's internal resistance with a multimeter. If the resistance is significantly lower than the manufacturer's specification, the internal coil is shorted, which pulls the circuit voltage down and causes this code.