P25E4: B Camshaft Position - Unable to Achieve Locked Position Bank 1
Camshaft phaser B on bank 1 cannot reach its base position at engine shutdown so the lock pin never engages. Next cold start may run rough until oil pressure builds.
What P25E4 means
P25E4 is a generic OBD-II powertrain code in the timing, cam & crank group. Bank 1 is the side of the engine with cylinder 1 (inline engines only have bank 1).
- Check engine light
- Usually on
- Emissions-related
- No
- Limp mode possible
- Not typical
- Drive cycle to clear
- Not required
Get it fixed
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Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Common causes
- 01Worn vanes or housing inside the phaserMost likely
- 02Sludge or contaminated oil prevents return to basePossible
- 03Oil control valve leaks internallyPossible
Can I drive with P25E4?
Usually yes, for a short time.
The car will often drive normally, but get it diagnosed soon. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
Why we rate it moderate
- Turns on the check engine light
Severity is our rule-based rating from the code’s flags in OBDex and the system it affects, not an inspection of your car. If the check engine light is flashing, or you notice overheating, low oil pressure, or brake or steering problems, stop driving and get help.
How to diagnose P25E4
- 1
Confirm the code and save freeze-frame data
Read the codes with an OBD-II scan tool and note every code, not just P25E4. Save the freeze-frame data (speed, load, temperature when the fault set) before clearing anything; it tells you when the fault happens.
- 2
Check for related codes first
Look for P25E1, P25E7, P25DE. Related codes often share a cause; a circuit or sensor code usually needs fixing before a performance code like this one.
- 3
Check live data
Watch the related sensor and actuator readings in live data (Cam phaser B bank 1, Park lock pin, Oil control valve) and compare them with expected values in the service information for your vehicle.
- 4
Test the likely causes in order
Start with the most likely cause and work down: Worn vanes or housing inside the phaser; sludge or contaminated oil prevents return to base; oil control valve leaks internally. Test before replacing parts.
- 5
Check for recalls and service bulletins
Look up recalls for your exact vehicle with its VIN, and ask a dealer about technical service bulletins (TSBs). Manufacturers sometimes issue software updates or extended warranties for known faults.
- 6
Clear the code and verify the repair
After the repair, clear the code and drive the car under the conditions in the freeze-frame data to confirm it does not return.
P25E4 repair cost estimate
Estimate, not a quote. Labor times are typical ranges for this code from OBDex, and $125/hr is an assumed rate. Shop rates and labor times vary by vehicle and region. Diagnosis time may be billed separately.
- DIY difficulty
- Hard
- Good DIY job?
- Usually a shop job
Involved testing or major parts. Most owners use a shop.
Parts and systems involved
- Cam phaser B bank 1
- Park lock pin
- Oil control valve
P25E4 FAQ
What does P25E4 mean?
P25E4 means “B Camshaft Position - Unable to Achieve Locked Position Bank 1”. Camshaft phaser B on bank 1 cannot reach its base position at engine shutdown so the lock pin never engages. Next cold start may run rough until oil pressure builds.
Is P25E4 serious? Can I keep driving?
We rate P25E4 as moderate severity. Usually yes, for a short time. The car will often drive normally, but get it diagnosed soon. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
What causes P25E4?
The most common causes, from most to least likely: Worn vanes or housing inside the phaser; Sludge or contaminated oil prevents return to base; Oil control valve leaks internally. Test before replacing parts, because several causes can set the same code.
How much does it cost to fix P25E4?
Typical labor is about $190–$625 at an assumed $125/hour shop rate, plus parts. That is an estimate, not a quote: labor times and rates vary by vehicle and region, and diagnosis may be billed separately.
Can I fix P25E4 myself?
DIY difficulty is hard. Most owners leave this to a shop because it needs involved testing or specialist tools. Always confirm the cause before buying parts.
Will P25E4 clear itself?
If the fault was intermittent, the warning may go off once the computer stops seeing it, but the code stays in memory. Fix the cause; clearing the code alone doesn’t repair anything.