Fuel and air

P00CC — Fuel Volume Regulator Solenoid Supply Voltage Circuit Low

Severity: medium Drive with care, to a shop

What P00CC means

The PCM drives a fuel volume regulator solenoid that meters how much fuel the high-pressure pump sends to the fuel rail. P00CC sets when the voltage in this solenoid's supply circuit is lower than expected. As a result, rail pressure may not be controlled accurately.

Symptoms

  • Check Engine light on
  • Hesitation or stumbling under acceleration
  • Reduced power or limp mode
  • Hard starting or long cranking
  • Unstable fuel rail pressure
  • Engine may stall

Possible causes

  1. Damaged wiring or corroded connector in the solenoid circuit
  2. Weak battery or charging system problem causing low system voltage
  3. Faulty fuel volume regulator solenoid
  4. Low-pressure fuel supply fault (pump, filter, lines)
  5. Worn or faulty high-pressure pump
  6. Faulty fuel rail pressure sensor
  7. Excessive injector return flow
  8. Faulty PCM (rare)

How to diagnose

  1. Scan all codes and freeze frame data, and look for other voltage-related codes
  2. Test battery voltage at rest and charging voltage with the engine running
  3. Inspect the solenoid harness and connector for corrosion, chafing, loose pins or oil contamination
  4. Check supply voltage and ground at the solenoid connector with the ignition on
  5. Measure solenoid resistance and compare it with the manufacturer spec
  6. Compare commanded and actual rail pressure at cranking, idle and under load
  7. Test low-pressure fuel pressure and volume and check the filter
  8. Measure injector return flow if applicable

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the fuel volume regulator solenoid
  • Replace or charge the battery and repair any charging fault
  • Replace the fuel filter or low-pressure pump if supply is weak
  • Replace the high-pressure pump or rail pressure sensor if confirmed faulty

Questions and answers

What does P00CC mean?

It means low voltage in the supply circuit of the fuel volume regulator solenoid. The PCM isn't seeing the expected voltage, so it can't accurately control fuel delivery to the high-pressure pump.

Can I drive with code P00CC?

Briefly and carefully, yes, but the engine may lose power, hard-start or stall. Check the battery and wiring first.

Can a weak battery cause P00CC?

Yes. A weak battery or failing alternator can pull system voltage down and trigger this code. Start by measuring battery and charging voltage.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.