P2371 — Fuel-volume regulator B control circuit — performance fault

P2371 concerns fuel-volume regulator B control circuit. The monitor reports that the named control function does not meet its expected operating behavior. The code names fuel-volume regulation and channel B. It does not simply state that fuel pressure is too high or too low.

Affected system: Fuel metering and pressure control

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Fuel supply or pressure issue, restricted injector, actuator fault, connector or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Repair the verified cause and confirm the code does not return

Also written as: P2371-00, P237100 (some scan tools add the fault-type byte, e.g. -00).