P2373 code meaning
Fuel Volume Regulator B Control Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2373 means
P2373 points to too much voltage or current in the control circuit of fuel volume regulator B, typically from a short to battery voltage or a shorted coil. No manufacturer publishes the B version; P0004 on regulator A is the model. Ford's 2023 diesel sets that code when the energised valve draws more than 3.7 A, while 2.2 A is the normal maximum. Deutz's EMR controller lists a short to battery on the high side as P0004-00 and treats critically high output current separately. Ford's gasoline summary explains why ECMs guard this circuit closely: the coil can overheat and fail when battery voltage sits on it permanently. A protecting driver switches off, so regulator B stops metering and rail pressure drifts, often with reduced power.
P2373 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2373
- Check engine light on
- Reduced power or limp-home mode
- Rail pressure deviation codes stored as well
Common causes of P2373
- Most likelyControl wire shorted to battery voltage
- PossibleRegulator coil with shorted turns drawing excess current
- Less likelyECM output stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel volume regulator bHigh pressure fuel pumpFuel volume regulator wiring
What each part of P2373 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 73 | The exact fault in that area. |
What to do next
- Note P2373 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2373
What does P2373 mean?
P2373 means "Fuel Volume Regulator B Control Circuit High". P2373 points to too much voltage or current in the control circuit of fuel volume regulator B, typically from a short to battery voltage or a shorted coil. It is a generic code, so it means the same on every make.
Is it safe to drive with P2373?
Drive gently and only to a workshop. With P2373 the car can go into limp mode (reduced power) to protect itself.
Will P2373 fail an emissions test?
Yes, it can. P2373 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2373 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2373 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.