What it means
The exhaust camshaft actuator park-lock circuit on bank 1 is detected as open. The code identifies an electrical circuit fault; it does not by itself establish that the phaser cannot lock or that the engine will run poorly.
At a glance
- Usually lights the check-engine light
How it works
The exhaust camshaft actuator park-lock solenoid on bank 1 helps hold that exhaust phaser in its parked position under conditions specified for the engine. The control module monitors the electrical circuit and sets P25D0 when it detects an open circuit, such as an open coil or broken wire; the code alone does not confirm mechanical phaser trouble.
Common causes
Most likely first.
- Open coil in the park-lock solenoid
- Broken control wire between ECU and solenoid
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
How to diagnose it
- Record freeze-frame data and related camshaft or actuator codes, noting whether the open was detected at start-up or during operation.
- Identify bank 1 and inspect the exhaust park-lock solenoid connector and nearby harness for looseness, corrosion, heat damage, or a broken wire.
- Check the bank 1 exhaust solenoid coil and circuit continuity using the manufacturer's procedure and specifications.
- With components isolated as directed by service information, test the wire between the solenoid and control module for an open.
- If the solenoid and wiring pass, use supported scan-tool actuator data or commands to assess control-module operation.
Common fixes
- Reconnect or clean and secure the bank 1 exhaust park-lock solenoid connector.
- Repair an open or damaged wire in the bank 1 exhaust actuator circuit.
- Replace the bank 1 exhaust park-lock solenoid if its coil is open.
- Repair the control-module circuit only after confirming the solenoid and wiring are sound.
Can I keep driving?
If the engine runs smoothly and only the warning light is present, a short, gentle trip for diagnosis may be possible; avoid hard acceleration. Stop driving if it stalls, runs roughly, or loses power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.