What it means
The PCM detected an open in the control circuit for the fuel volume regulator B.
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 controls how much fuel enters the fuel system, with the PCM commanding the regulator through its control circuit. P2370 sets when the PCM detects an open in that circuit, so the regulator may not respond and fuel delivery can become inadequate.
Common causes
Most likely first.
- Open or damaged wiring or connector
- Faulty fuel volume regulator
Symptoms
- Check-engine light
- Hard starting or no-start
- Loss of power
- Poor acceleration
How to diagnose it
- Save freeze-frame data and note whether hard starting, stalling, or power loss occurred when the circuit fault set.
- Check for related fuel-pressure or regulator codes and inspect live fuel-pressure data against the manufacturer's specification.
- Inspect the fuel volume regulator B connector and wiring for disconnection, corrosion, damaged pins, or a broken wire.
- Use the manufacturer's wiring diagram to check circuit continuity and verify the regulator's power and control connections.
- Test fuel volume regulator B according to the manufacturer's procedure to determine whether the open is internal to the regulator or in the harness.
Common fixes
- Reconnect and secure the fuel volume regulator B connector if it is loose.
- Repair an open or damaged wire in the regulator B control circuit.
- Clean or replace corroded connector terminals and repair damaged seals.
- Replace fuel volume regulator B if it fails the manufacturer's test.
Can I keep driving?
A hard-start or no-start condition can leave you stranded, and loss of power can make driving unsafe; avoid long trips and heavy acceleration. If the engine stalls or cannot maintain power reliably, stop driving and have the fuel-system fault diagnosed.
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.