B Camshaft Position - Timing Over-Retarded (Bank 2)
The powertrain control module (PCM) has detected that the exhaust (B) camshaft timing for Bank 2 is more retarded than commanded. This typically occurs when the variable valve timing (VVT) system fails to advance the camshaft timing back to its normal base position.
While the vehicle will usually still drive, prolonged operation with incorrect camshaft timing can lead to poor performance, increased emissions, and potential engine wear. It should be diagnosed and repaired soon to restore proper engine function.
Common symptoms
- Illuminated Check Engine Light
- Rough idle or stalling
- Decreased engine power and acceleration
- Reduced fuel economy
- Increased engine emissions or failed emissions test
Likely causes
- Low engine oil level or dirty, degraded oil
- Faulty variable valve timing (VVT) solenoid / oil control valve on Bank 2
- Clogged VVT oil passages or screens
- Worn or damaged timing chain, tensioner, or guides
- Faulty camshaft position sensor or wiring issues
- Failing variable valve timing actuator (cam phaser)
What to check before replacing parts
Check the engine oil level and condition.
Look for: Low oil level, sludge, or extremely dirty oil, which can prevent the hydraulic VVT system from operating correctly.
Scan for related DTCs and monitor VVT live data.
Look for: Commanded versus actual camshaft position discrepancies on the Bank 2 exhaust cam using a professional scan tool.
Inspect the Bank 2 exhaust VVT solenoid (oil control valve) wiring and connector.
Look for: Frayed wires, loose or broken connectors, or oil intrusion inside the electrical connector.
Remove and test the Bank 2 exhaust VVT solenoid.
Look for: Clogged filter screens, a sticking valve spool, or failure of the valve to actuate smoothly when applying 12 volts.
Inspect the timing chain and cam phaser (actuator) mechanically.
Look for: A stretched timing chain, broken timing guides, or a physically damaged cam phaser that fails to return to the base position.
This page explains the generic P0025 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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