B Camshaft Position - Timing Over-Retarded Bank 2
What it means
P0025 means bank 2's "B" (typically exhaust) camshaft is timed more retarded than the ECM commanded — the variable-valve-timing phaser isn't reaching its target position. This is usually an oil-flow or phaser issue, so the engine runs rough and loses power, but it typically still starts and drives.
Can I keep driving? Yes, with care — a cam stuck over-retarded on bank 2 causes rough running and lost power, so drive gently and fix it before further phaser or chain wear.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or unstable idle
- Poor acceleration and reduced power
- Decreased fuel economy
- Startup rattle from the timing cover
Common causes
Most likely first
- Low or dirty engine oil restricting the VVT phaserLikely
- Stuck or clogged bank 2 camshaft oil control valve (VVT solenoid)Common
- Worn or stretched timing chain, or a failing phaserCommon
- Wiring or connector fault at the oil control valveLess often
- Faulty ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Check oil level and condition first, and change overdue oil.
- Read freeze-frame data for the operating conditions.
- Test and, if needed, replace the bank 2 oil control valve.
- Inspect the timing chain and phaser for wear or slack.
- Repair the fault, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P0025?+
Can I just clear P0025?+
Related codes
Read & clear P0025 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.