P25E4 code meaning
"B" Camshaft Position - Unable to Achieve Locked Position (Bank 1)
Powertrain system Generic code P25xx codes Check engine light
What P25E4 means
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.
P25E4 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P25E4
- Check engine lamp on
- Engine fails to restart after an automatic stop, restarts after an ignition cycle
- Rough start
Common causes of P25E4
- Most likelyEngine control software needing an update (documented for Stellantis Hurricane engines)
- PossibleLow oil pressure at hot idle so the phaser cannot swing into the lock
- PossibleDebris in the exhaust phaser or a sticking control valve
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cam phaser b b1Park lock pinOil control valve
What each part of P25E4 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| E4 | The exact fault in that area. |
What to do next
- Note P25E4 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P25E4
What does P25E4 mean?
P25E4 means ""B" Camshaft Position - Unable to Achieve Locked Position (Bank 1)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P25E4?
Drive gently and only to a workshop. With P25E4 the car can go into limp mode (reduced power) to protect itself.
Will P25E4 fail an emissions test?
Yes, it can. P25E4 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P25E4 to fix?
Difficulty: medium. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P25E4 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.