Short to voltage in the solenoid supply or control wiring; Damaged, corroded or loose connector at the fuel volume regulator or control unit; Faulty fuel volume regulator solenoid (internal fault); Chafed or damaged harness near the fuel pump or engine bay hot spots; Fault in the control unit driver circuit; Charging system fault causing abnormally high system voltage.

P00CD

Fuel Volume Regulator Solenoid Supply Voltage Control Circuit High.

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
CD: FaultThe specific fault in that area

What it means

P00CD means the engine control unit has detected a high voltage fault in the supply or control circuit of the fuel volume regulator solenoid. This solenoid (often called a metering or inlet valve on the high-pressure fuel pump) controls how much fuel the pump delivers to the rail. The control unit saw a circuit voltage above the expected range when it monitored the supply or control side. The exact circuit layout and test method depend on the model and engine.

Symptoms

Engine warning light on
Reduced power or limp mode
Hard starting or long cranking
Rough running or hesitation under load
Fuel rail pressure faults stored alongside the code
Engine stalling or failing to start

Possible causes

Short to voltage in the solenoid supply or control wiringlikely
Damaged, corroded or loose connector at the fuel volume regulator or control unitlikely
Faulty fuel volume regulator solenoid (internal fault)possible
Chafed or damaged harness near the fuel pump or engine bay hot spotspossible
Fault in the control unit driver circuitrare
Charging system fault causing abnormally high system voltagerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including battery voltage, engine speed and rail pressure, then check for related fuel pressure codes.
Check battery and charging voltage to rule out an over-voltage condition.
Visually inspect the regulator connector and harness for damage, corrosion, bent pins, rubbing or fuel and oil contamination.
Check the connector terminal tension and look for water ingress.
With the ignition off and connectors disconnected, test the supply and control wires for continuity and for a short to voltage or earth, using the manufacturer wiring diagram.
Measure the solenoid resistance and compare it with the specification for that engine.
With the ignition on, check the supply voltage at the connector against the wiring diagram.
Use a scan tool that can command the regulator, if supported, and watch the response and rail pressure. Check for software updates relevant to the vehicle.

How to fix

Repair or replace the wiring that is shorted to voltage, and secure it away from heat and rubbing points.
Clean or replace the damaged connector or terminals.
Replace the fuel volume regulator solenoid if its resistance or operation is out of specification, following the procedure for that engine.
Repair any charging system fault found.
Replace or repair the control unit only after the wiring and solenoid are proven good and the manufacturer confirms a driver fault.
Clear the code after the repair and road test to confirm it does not return.

Can I keep driving?

Medium severity

The car may run in limp mode or stall, so avoid long journeys and get it checked soon. If it loses power or struggles to keep running, stop driving it and have it recovered.

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