Fuel Volume Regulator "B" Control Circuit Low
The P2372 code means the vehicle's onboard diagnostic system has detected: Fuel Volume Regulator "B" Control Circuit Low. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- medium
- Estimated cost
- $30-$150 for a wiring/connector repair; $200-$500 to replace the fuel volume regulator (suction control valve) with labor
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Common Symptoms
- Check Engine Light illuminated
- Hard starting or extended cranking
- Rough idle and engine surging
- Hesitation or stalling under load
- Reduced power / possible limp mode from poor fuel-pressure control
Probable Causes (Ranked by Likelihood)
- Damaged or corroded wiring/connector in the fuel volume regulator B control circuit (short to ground or high resistance) Very High
- Faulty fuel volume regulator (fuel metering solenoid / suction control valve) High
- Poor electrical ground or chafed harness near the high-pressure fuel pump Moderate
- PCM/ECM driver or internal control fault Low
Frequently Asked Questions
What does P2372 mean?
P2372 means the PCM detected a low-voltage (low) condition in the Fuel Volume Regulator "B" control circuit. The fuel volume regulator -- a solenoid (often called a suction control valve) that meters how much fuel the high-pressure pump delivers -- is reporting a control-circuit voltage below the expected range, which can disrupt fuel-rail pressure control. It is most often a wiring, connector, or regulator-solenoid problem on direct-injection (common-rail) engines.
Can I drive with P2372?
Only short distances. A fuel-volume-regulator control-circuit fault can make rail pressure unstable, causing hard starts, hesitation, stalling, or a reduced-power limp mode. Get it diagnosed before relying on the vehicle.
How much does it cost to fix P2372?
If the fault is wiring or a connector, repair is often $30-$150. If the fuel volume regulator (suction control valve) itself has failed, replacement with labor typically runs $200-$500, more on engines where the regulator is hard to access.
Mechanics Guide Step-by-step diagnosis, and what most sources get wrong
Step-by-Step Diagnostic Procedure
-
Read P2372 and review freeze frame data, noting commanded vs. actual fuel rail pressure and the regulator duty cycle.
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Inspect the fuel volume regulator (fuel metering / suction control valve) connector and wiring for corrosion, chafing, and a secure ground.
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Back-probe the regulator control circuit and check supply voltage, the PCM-side control signal, and circuit resistance against spec.
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Command the fuel volume regulator with a scan tool and verify it responds; if the circuit checks out, test or replace the regulator solenoid.
Common Misconceptions / Fact Check
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Commonly claimedSome databases describe P2372 as a Ford Power Stroke 'Injector Control Pressure (ICP) System' fault.
VerifiedP2372 is Fuel Volume Regulator "B" Control Circuit Low: a fuel-metering circuit fault on common-rail and direct-injection engines. Ford HEUI injector-control-pressure faults are a different system with their own codes.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- Common-rail diesel light trucks (Ram/Cummins, GM Duramax, Ford 6.7L Power Stroke)
- European common-rail diesels (VW/Audi TDI, BMW and Mercedes diesel)
- Gasoline direct-injection (GDI) engines that use an electronic fuel-metering / suction-control valve
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