What it means
The exhaust camshaft actuator park-lock circuit on bank 1 is above the expected electrical threshold. This indicates a high circuit condition; the code alone does not identify its cause.
At a glance
- Usually lights the check-engine light
How it works
The exhaust camshaft actuator park-lock circuit on bank 1 controls the solenoid that holds the exhaust phaser in its parked position under specified conditions. P25D2 means the control module detected a circuit level above its expected threshold; the high condition alone does not show whether the cause is wiring, the solenoid connection, or the module driver.
Common causes
Most likely first.
- Control wire shorted to a B+ supply
- ECU output driver stuck on
- Connector pins corroded - high contact resistance
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 actuator codes, including when the bank 1 exhaust circuit was reported high.
- Inspect the bank 1 exhaust park-lock connector and harness for damaged insulation, contact with a power feed, corrosion, or loose terminals.
- Check the circuit supply and control behavior against the vehicle wiring information and manufacturer's specifications.
- With the circuit isolated as directed by service information, test the bank 1 exhaust control wire for a short to battery voltage.
- If the wiring and solenoid pass, use supported scan-tool data or tests to evaluate whether the control-module output is stuck active.
Common fixes
- Repair damaged wiring that allows the bank 1 exhaust control circuit to contact a power feed.
- Clean, secure, or repair faulty terminals at the park-lock solenoid connector.
- Replace the solenoid if it fails the manufacturer's electrical test.
- Repair the control-module output only after confirming the wiring and solenoid are sound.
Can I keep driving?
If the engine runs normally, drive gently only as needed to arrange diagnosis and avoid hard acceleration. Stop in a safe place 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.