What it means
Supply voltage to fuel volume regulator solenoid above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
The fuel volume regulator solenoid controls how much fuel the high-pressure fuel system supplies. The control module monitors the solenoid’s supply circuit and sets P00CD when its voltage is higher than expected, which can happen if the wire contacts a battery-positive source or the charging voltage is abnormal.
Common causes
Most likely first.
- Alternator regulator failed
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check engine light on
- Hard starting or extended cranking
- Engine may stall or run roughly
- Reduced power or hesitation
How to diagnose it
- Record freeze-frame data and charging-system readings to see whether the fault appeared with unusually high system voltage.
- Inspect the regulator solenoid connector and harness for water, corrosion, pushed-back pins, chafing, or contact with a B+ wire.
- With the code active, gently move the solenoid harness while watching the supply-voltage data to check for an intermittent change.
- Check the charging system and alternator regulator against the manufacturer's specification.
- Test the regulator supply wire for an unintended connection to B+ and check connector pin fit and circuit continuity using the manufacturer's procedure.
Common fixes
- Repair chafed or pinched wiring and secure it away from B+ sources.
- Clean or repair corroded or loose connector terminals and restore any displaced pins.
- Repair or replace the alternator regulator if charging voltage is out of specification.
- Replace the fuel volume regulator solenoid if its supply circuit tests correctly but the fault remains.
Can I keep driving?
Avoid relying on the vehicle for long trips: hard starting, stalling, rough running, or reduced power may make it unreliable in traffic. If it stalls or loses power, stop driving and arrange a repair.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.