Powertrain, generic (extended)

P25CD Intake Camshaft Actuator Park Lock Control Circuit/Open (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P25CD is the bank 2 version of the open-circuit lock fault and therefore only appears on V or boxer engines whose second cylinder bank has its own intake phaser with a separately switched lock pin. The controller finds the lock solenoid circuit on that bank interrupted or electrically implausible, so it can no longer release or set the pin deliberately. If bank 1 is free of faults, comparing both banks' lock circuits with a multimeter quickly isolates the broken side. GM's 15OBDG01 OBD table lists P25CD in its intake phaser fault bundles even though the Volt engine it covers has a single bank, which shows these entries are shared software rather than an engine-specific description. Symptoms are uneven idle and lower power from the affected bank.

Likely causes

Open circuit inside the bank 2 lock solenoid
Bank 2 lock solenoid connector unplugged or corroded
Wire break in the harness across the engine

Symptoms

  • Check engine lamp on
  • Uneven idle
  • Less power, bank 2 intake timing fixed

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

P25CAP25CEP25CFP25D3P0020

References: gsi.ext.gm.com, law.cornell.edu, en.wikipedia.org.