Wiring fault in the regulator supply or control circuit, such as chafing, a short to ground or high resistance; Corroded, loose or damaged connector at the fuel volume regulator or the control unit; Faulty fuel volume regulator solenoid, with an internal short or low coil resistance; Low or unstable system voltage from a weak battery, poor earth or charging fault; Blown fuse or faulty relay or power feed to the regulator circuit; Internal fault in the engine control unit driver circuit.

P00CC

Fuel Volume Regulator Solenoid Supply Voltage Control Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
CC: FaultThe specific fault in that area

What it means

P00CC means the engine control unit has detected a voltage that is too low in the supply voltage control circuit of the fuel volume regulator solenoid. This solenoid meters how much fuel reaches the high-pressure fuel pump, so it helps control rail pressure. The fault sets when the measured circuit voltage is lower than the control unit expects for the commanded state.

Symptoms

Engine warning light on
Reduced power or limp mode
Long cranking or hard starting
Rough running, hesitation or surging under load
Engine stalling or cutting out
Other fuel pressure fault codes stored alongside it

Possible causes

Wiring fault in the regulator supply or control circuit, such as chafing, a short to ground or high resistancelikely
Corroded, loose or damaged connector at the fuel volume regulator or the control unitlikely
Faulty fuel volume regulator solenoid, with an internal short or low coil resistancelikely
Low or unstable system voltage from a weak battery, poor earth or charging faultpossible
Blown fuse or faulty relay or power feed to the regulator circuitpossible
Internal fault in the engine control unit driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage, engine speed and load when the fault set, and check for related fuel pressure codes.
Check battery condition and charging voltage, and inspect the main earth and power connections, as low system voltage can set this code.
Visually inspect the wiring and connectors between the regulator and the control unit for chafing, heat damage, corrosion, water ingress and pushed-out pins.
Check the relevant fuse and any relay in the regulator supply, using the wiring diagram for the specific model and engine.
With the connector unplugged, measure the regulator solenoid resistance and compare it with the manufacturer specification.
Check the supply and control circuit for voltage, continuity and shorts to ground, following the wiring diagram.
Use a live data or actuator test, if supported, to see whether the regulator responds and whether rail pressure follows the demand.
If wiring and the solenoid test good, check the control unit power and earth feeds before considering the control unit itself.

How to fix

Repair or replace damaged wiring, correcting any short to ground or high resistance in the circuit.
Clean or replace corroded or damaged connectors and terminals, and secure them properly.
Replace the fuel volume regulator solenoid if its resistance or operation is out of specification; on some engines it is part of the high-pressure pump assembly.
Replace a weak battery or repair charging or earth faults to restore stable system voltage.
Replace the blown fuse or faulty relay, after finding out why it failed.
Repair or replace the engine control unit only after all wiring, power and the regulator have been confirmed good, and have it programmed if required.

Can I keep driving?

Medium severity

The car may still run, but it could lose power, stall or go into limp mode without warning. Get it checked soon and avoid long journeys or situations where a sudden loss of power would be unsafe.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.