P00CD: Fuel Volume Regulator Solenoid Supply Voltage Control Circuit High

The fuel volume regulator is the solenoid valve that meters how much fuel the high-pressure pump delivers (metering unit on diesels, pump control valve on some gasoline direct-injection engines). Many control modules switch such solenoids on both sides; P0001 to P0004 cover the control side, while these codes cover the supply side (high-side driver). P00CD reports a short to battery voltage on the supply side. Rail pressure may then deviate, with reduced power or hard starting. None of the published manufacturer documents searched uses this code; the explanation follows regulations and comparable manufacturer monitors.

Medium severity. Can I keep driving?Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.

Symptoms

Check engine light on
Loss of power or limp mode
Hard starting or jerking

Most likely causes

Supply wire shorted to battery voltage
Regulator coil open or shorted (often built into the pump)
High-side driver in the engine control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

Check the pump's fuse, relay, and connector
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Replace the filter if it is due for maintenance
Compare commanded and actual pressure in live data
Measure the pressure with a suitable gauge
Check the sensor and regulator before replacing the pump

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P00CD means

P: Powertrain: engine and transmission
0: Generic code: same on every make
0: Subsystem depends on the code range
CD: Specific fault in that system

Frequently asked questions

Can I keep driving with code P00CD?

Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.

What causes code P00CD?

The most common causes are: supply wire shorted to battery voltage; regulator coil open or shorted (often built into the pump); high-side driver in the engine control module faulty.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.