Powertrain, generic (extended)

P25D2 Exhaust Camshaft Actuator Park Lock Control Circuit High (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P25D2 is set when the bank 1 exhaust phaser lock control line carries more voltage than the controller allows in the current switching state, for example because it is shorted to an ignition-fed wire or the solenoid's return is tied to supply. Most output stages detect overcurrent here and switch off, so the lock solenoid loses its command and the pin goes to the position its spring defines. The engine then runs with a fixed exhaust cam until the fault clears. No manufacturer publishes material for P25D2; the explanation uses the J2012 title, CARB's demand for electrical monitoring of output components in variable valve timing systems, and the working principle of locking phasers. Unlike the Low code, a short to power can also damage the driver.

Likely causes

Lock control wire shorted to an ignition-fed circuit
Solenoid return path shorted to supply
Damaged output stage in the engine control module

Symptoms

  • Check engine lamp on
  • Weaker mid-range pull

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

exhaust cam phaser b1park lock solenoidwiring harness

Related codes

P25D0P25D1P25D5P25CCP2091

References: law.cornell.edu, en.wikipedia.org.