OBD-II code · Powertrain (generic, extended)
P2370 Fuel Volume Regulator B Control Circuit Open
An open circuit is detected on the control line for the second fuel volume regulator (B) used on twin high-pressure-pump diesel systems. Without this regulator the high-pressure pump cannot meter fuel for its assigned cylinder bank, leading to rail-pressure faults and limp-home behaviour.
Is it safe to drive with P2370?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in harness or connector to regulator B
- PossibleRegulator solenoid winding open
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Volume Regulator B, High Pressure Pump B, Fuel Rail
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.