P2370 means the engine control module has detected an open electrical circuit in the control path for the 'B' fuel volume regulator, also called a fuel metering or inlet metering valve on many common-rail fuel systems. An open circuit prevents the module from commanding the regulator, so fuel delivery and rail pressure cannot be properly controlled. This typically turns on the malfunction indicator lamp and may force the engine into a reduced-power or no-start condition.
The regulator coil can open internally, so the PCM sees infinite resistance on the control circuit and sets the code.
A break anywhere between the PCM driver and the regulator solenoid creates the open-circuit condition the code reports.
Poor contact at the regulator or harness connector adds resistance or creates a complete open, causing the same circuit fault.
If the regulator's power supply is fused or relay-controlled, loss of power to the solenoid can be reported as a control-circuit open.
A failed output driver inside the control module is possible but uncommon; it should only be considered after the regulator, wiring, and power/ground are proven good.
No. The engine may stall, fail to restart, or enter limp mode, so the vehicle should be diagnosed and repaired before regular driving resumes.
Usually no. PCM failure is one of the least likely causes of this code. Most cases are caused by a failed fuel volume regulator, wiring damage, or a connector problem.
It is a solenoid-controlled valve, often an inlet metering valve on a common-rail high-pressure fuel pump, that regulates how much fuel enters the pump to control rail pressure. The 'B' identifier refers to a second or secondary regulator on the vehicle.
Yes, if the regulator circuit is fused. A missing power supply can be interpreted as an open control circuit, so fuses should be checked before replacing any components.