P2370: Fuel Volume Regulator B Control Circuit/Open
What to do
Ordinary electrical work on a part with an intimidating name — wiring, connector, then the regulator's own winding. If the engine has two banks, ask whether the symptoms split by bank; that answer is diagnostic and free.
What this code means
The control circuit for the second fuel volume regulator has failed open — the B designator marking an engine with two metering valves, which is the page's real information.
The fuel volume regulator is the valve on a high-pressure pump's inlet that decides how much fuel the pump is given — metering on the cheap side of compression, as the P0001 family explains for regulator A. A B regulator means either two high-pressure pumps (large V diesels feed one per bank) or a pump with twin metering circuits; either way, everything the corpus says at P0001 applies per unit, and the bank split becomes free evidence — a rail pressure complaint on one bank with the other healthy points at that bank's regulator and pump before anything shared.
An open circuit typically leaves the valve at its spring default. Which default varies by design: full delivery (pressure control falls to the relief path, noisy and crude but drivable) or minimal delivery (that pump's contribution gone). The companion rail-pressure codes say which happened.
Likely causes
Start here
- Open circuit in actuator wiring · moderate
- Corroded or loose connector · easy
Less common
- Failed fuel volume regulator · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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