What it means
Same as P2370 with the control line shorted to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Fuel volume regulator B is an ECU-controlled valve that helps meter fuel in the high-pressure system. P2372 sets when the ECU detects regulator B's control circuit voltage is too low, commonly because the control wire is grounded or the solenoid is shorted.
Common causes
Most likely first.
- Control line shorted to ground
- Regulator solenoid shorted internally
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Hard starting or no-start
- Loss of power
- Poor acceleration
How to diagnose it
- Check freeze-frame data and scan for related fuel-pressure codes, noting whether the engine had hard starting or low rail pressure when the fault set.
- Inspect regulator B's connector and harness for chafing, moisture, corrosion, pushed-back pins, or a wire touching ground.
- With the circuit diagram and manufacturer's procedure, check regulator B's control wire for a short to ground.
- Check connector terminal fit and continuity through the control circuit, paying attention to corroded pins that can disrupt the signal.
- If the harness checks out, test regulator B's solenoid for an internal short using the manufacturer's specification.
Common fixes
- Dry and clean regulator B's connector and restore corroded or loose terminals.
- Repair chafed wiring or a control wire shorted to ground.
- Replace regulator B if its solenoid is internally shorted.
- Address any confirmed fuel-pressure or pump fault that remains after the circuit is repaired.
Can I keep driving?
Hard starting, stalling, or power loss can make driving unpredictable; avoid busy roads and hard acceleration. If the engine will not start reliably or loses power, stop driving and arrange repair.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.