"B" Camshaft Position - Timing Over-Advanced (Bank 1)
Exhaust camshaft position bank 1 over-advanced or system performance — the actual cam phase exceeds the commanded value. Usually caused by a stuck-open oil control valve, low oil pressure, sludged passages, or a worn cam phaser. Confirm with a scan tool live data: command 0° advance and watch actual.
Affected components
- Camshaft position actuator
- Oil control valve
- Cam phaser
Common causes
- High likelihood: Oil control valve stuck (advance)
- Medium likelihood: Sludge in VVT oil passages
Possible symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.