OBD-II code · Powertrain (generic)
P00CA Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit High
Supply voltage to fuel pressure regulator A solenoid above expected range — typically charging system overvoltage. 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.
Is it safe to drive with P00CA?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAlternator regulator failed
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Regulator Supply, Charging System
Related codes
- P233FFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit High
- P00C7Intake Air Pressure Measurement System - Multiple Sensor Correlation Bank 1
- P00C8Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit/Open
- P00C9Fuel Pressure Regulator A Solenoid Supply Voltage Control Circuit Low
- P00CBFuel Volume Regulator Solenoid Supply Voltage Control Circuit/Open
- P00CCFuel Volume Regulator Solenoid Supply Voltage Control Circuit Low
- P00CDFuel Volume Regulator Solenoid Supply Voltage Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.