P25E1 code meaning
"A" Camshaft Position - Unable to Achieve Locked Position (Bank 2)
Powertrain system Generic code P25xx codes Check engine light
What P25E1 means
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.
P25E1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 7 hours
- Clears after repairAfter a drive cycle
Symptoms of P25E1
- Check engine lamp on
- Brief rattle from the timing drive on start-up
- Unsteady running right after a cold or warm start
Common causes of P25E1
- Most likelyLow oil pressure at hot idle from worn pump, bearings or thin oil
- PossibleVarnish or debris in the bank 2 intake phaser
- PossibleControl valve unable to move the spool into its lock range
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cam phaser a b2Park lock pinOil control valve
What each part of P25E1 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. |
| E1 | The exact fault in that area. |
What to do next
- Note P25E1 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 P25E1
What does P25E1 mean?
P25E1 means ""A" Camshaft Position - Unable to Achieve Locked Position (Bank 2)". P25E1 is set when the intake phaser on bank 2 fails to re-engage its lock. It is a generic code, so it means the same on every make.
Is it safe to drive with P25E1?
Drive gently and only to a workshop. With P25E1 the car can go into limp mode (reduced power) to protect itself.
Will P25E1 fail an emissions test?
Yes, it can. P25E1 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 P25E1 to fix?
Difficulty: hard. A typical repair takes 0.5 to 7 hours of work. This is a job for a workshop.
Will P25E1 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.