P25CAIntake Camshaft Actuator Park Lock Control Circuit/Open (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some cam phasers carry a locking pin that holds the rotor in a fixed base or middle position for starting and while oil pressure is still building. Where that pin is released and engaged by its own solenoid, the controller supervises this extra circuit. P25CA reports that the lock control circuit for the intake phaser on bank 1 is open or otherwise not behaving electrically, so the lock can no longer be operated on command. GM's 2015 Volt and ELR table 15OBDG01 lists P25CA among the intake phaser fault groups that suspend the other cam phaser diagnostics; it gives no thresholds of its own. Passive designs such as BorgWarner's mid-position lock for Hyundai lack this circuit. Expect rough starts or idle and limited cam timing.
- What you may notice
- Check engine lamp on
- Rough start or unsteady idle
- Intake cam timing held at a default position, less power
- Likely causes
- LikelyOpen winding in the intake phaser lock solenoid
- PossibleConnector off or terminal pushed back after engine work
- PossibleBroken wire between module and lock solenoid
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.