Powertrain, generic (extended)

P25CF Intake Camshaft Actuator Park Lock Control Circuit High (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P25CF is logged when the bank 2 intake phaser lock control line stays above its permitted voltage band. Common reasons are contact with a powered wire, moisture bridging connector pins to a supply terminal, or a failed output transistor in the controller. Once the driver protects itself and stops switching, the second bank's lock can no longer be released, so its intake cam may stay at the base timing while bank 1 still adjusts; the resulting imbalance shows up as a lumpy idle. In GM's 15OBDG01 table P25CF closes the list of intake phaser lock codes in the fault bundles that suspend the other phaser tests; no threshold is published. Before replacing the controller, measure the line with the solenoid unplugged.

Likely causes

Bank 2 lock control wire touching a powered circuit
Moisture in the connector bridging to a supply pin
Failed output transistor in the engine control module

Symptoms

  • Check engine lamp on
  • Lumpy idle from uneven bank timing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time0.5–3.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

intake cam phaser b2park lock solenoidwiring harness

Related codes

P25CCP25CDP25CEP25D5P2093

References: gsi.ext.gm.com, law.cornell.edu.