Powertrain, generic (extended)

P25D3 Exhaust Camshaft Actuator Park Lock Control Circuit/Open (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P25D3 concerns engines with two cylinder banks and a lockable exhaust phaser on each: the lock solenoid circuit of the bank 2 exhaust phaser is open or electrically implausible, so the module loses control over its pin. On many V engines the bank 2 exhaust solenoid sits at the rear or close to the firewall, where connectors are easily left loose after timing work. A loose plug sets only this code, whereas an open in a shared supply would usually trigger lock codes on several phasers at once. No manufacturer documents P25D3 in public material; the text is based on CARB's variable valve timing and output monitoring rules and on how locking phasers operate. The engine keeps running, but with fixed exhaust timing on bank 2.

Likely causes

Bank 2 exhaust lock connector left loose after timing work
Open winding in the bank 2 exhaust lock solenoid
Open in a supply shared with other phaser solenoids

Symptoms

  • Check engine lamp on
  • Uneven running between the banks

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

exhaust cam phaser b2park lock solenoidwiring harness

Related codes

P25D0P25D4P25D5P25CDP0023

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