Powertrain, generic (extended)

P25E4 "B" Camshaft Position - Unable to Achieve Locked Position (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P25E4 means the bank 1 exhaust phaser does not reach and engage its locking position when the controller asks for it, for example before shutdown or an automatic engine stop. Stellantis lists P25E4 in several PCM reflash bulletins for Wagoneer and Grand Wagoneer models with the 3.0-litre Hurricane high-output twin-turbo inline six and stop-start, among them 18-022-25 Rev. A for 2025 and 18-040-26 for 2022; the remedy there is new software, and the listed complaints include no restart after a stop-start event. An inline six only has bank 1, so the bank 2 code P25E7 does not apply there. Outside such software cases, low oil pressure at hot idle, debris in the phaser or a sticking control valve keep the pin from dropping in. CARB lists a pin that fails to move into place as a fault the VVT monitor must find.

Likely causes

Engine control software needing an update (documented for Stellantis Hurricane engines)
Low oil pressure at hot idle so the phaser cannot swing into the lock
Debris in the exhaust phaser or a sticking control valve

Symptoms

  • Check engine lamp on
  • Engine fails to restart after an automatic stop, restarts after an ignition cycle
  • Rough start

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,500
Time0.5–6 h

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

Parts involved

cam phaser b b1park lock pinoil control valve

Related codes

P25E3P25E5P25E7P25DEP0014

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.