Powertrain, generic (extended)

P25E1 "A" Camshaft Position - Unable to Achieve Locked Position (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P25E1 is set when the intake phaser on bank 2 fails to re-engage its lock. The controller commands the phaser toward the locking angle, usually when shutting down or before an idle stop, and then checks whether the measured cam angle settles there; on bank 2 it does not. No manufacturer has published a description of P25E1. Mid-position locks like BorgWarner's, used on Hyundai's Gamma II, rely on oil-driven cam torque to swing the rotor into the slot, so low oil pressure at hot idle, varnish in the phaser or a control valve unable to reach the lock band are the likely culprits. Without the pin the following start is less stable and a brief rattle may be heard. CARB's VVT rules treat a pin that does not move into place as a mechanical fault to be detected. Bank 1 has its own code, P25DE.

Likely causes

Low oil pressure at hot idle from worn pump, bearings or thin oil
Varnish or debris in the bank 2 intake phaser
Control valve unable to move the spool into its lock range

Symptoms

  • Check engine lamp on
  • Brief rattle from the timing drive on start-up
  • Unsteady running right after a cold or warm start

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,600
Time0.5–7 h

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

Parts involved

cam phaser a b2park lock pinoil control valve

Related codes

P25DEP25E0P25E2P0021P0018

References: borgwarner.com, law.cornell.edu.