P25D1 code meaning
Exhaust Camshaft Actuator Park Lock Control Circuit Low (Bank 1)
Powertrain system Generic code P25xx codes Check engine light
What P25D1 means
P25D1 indicates that the control signal for the bank 1 exhaust phaser lock is too low, normally a grounded wire or a solenoid winding that leaks to ground. The exhaust side is the hotter one, so insulation that has hardened and cracked near the manifold or turbocharger is a typical finding. With the line grounded, the solenoid may stay powered and keep the pin retracted, or it never gets current, in which case the phaser stays locked. Either way the controller usually stops adjusting exhaust timing and falls back to a safe default. No public manufacturer document lists P25D1; the description follows the J2012 wording, CARB's requirement for circuit checks on output components and the general working of locking cam phasers.
P25D1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P25D1
- Check engine lamp on
- Exhaust timing fixed, slightly less power
Common causes of P25D1
- Most likelyHeat-cracked insulation grounding the lock wire
- PossibleShorted exhaust lock solenoid
- Less likelyEngine oil wicked into the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust cam phaser b1Park lock solenoidWiring harness
What each part of P25D1 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. |
| D1 | The exact fault in that area. |
What to do next
- Note P25D1 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 P25D1
What does P25D1 mean?
P25D1 means "Exhaust Camshaft Actuator Park Lock Control Circuit Low (Bank 1)". P25D1 indicates that the control signal for the bank 1 exhaust phaser lock is too low, normally a grounded wire or a solenoid winding that leaks to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P25D1?
Drive gently and only to a workshop. With P25D1 the car can go into limp mode (reduced power) to protect itself.
Will P25D1 fail an emissions test?
Yes, it can. P25D1 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 P25D1 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P25D1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.