P00C9
Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit Low
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections for any loose or damaged components
- Test the fuel pressure regulator A solenoid for proper functioning
- Inspect the fuel pressure regulator itself for any clogs or blockages
- Verify and ensure the power supply to the solenoid is functioning correctly
- Replace the fuel pressure regulator A solenoid if necessary
Common causes
Most likely first
- Faulty fuel pressure regulator
- Low voltage supply to the fuel pressure regulator solenoid
- Wiring or connector issue in the fuel pressure regulator solenoid circuit
- Faulty Engine Control Unit (ECU) or Powertrain Control Module (PCM)
- Fuel pump malfunction or low fuel pressure
How to diagnose & fix
Work through it in order
- Engine misfires or stutters
- Decreased fuel efficiency
- Difficulty starting the vehicle
- Unusual engine noises or vibrations
- Engine stalls or shuts off randomly
Read & clear P00C9 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.