"B" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
Code P0014 means the PCM has detected that the "B" camshaft (exhaust camshaft) on Bank 1 is over-advanced — the exhaust cam timing has moved further in the advance direction than commanded, or the system cannot retard it back. This is the exhaust cam counterpart to P0011. On Bank 1, the exhaust cam is stuck or slow to return from an advanced position. Common causes are a stuck-open exhaust VVT solenoid, low or dirty oil, or a worn exhaust cam phaser that bleeds pressure from the retard chamber.
What You Might Notice
- Check engine light on
- Rough or unstable idle
- Hard hot starting
- Stalling at idle
- Increased emissions or failed emissions test
- Poor fuel economy
Most Common Causes
- 1
Low or dirty engine oil
Exhaust cam phasers depend on clean, pressurized oil to move between advance and retard positions. Low oil or sludge from deferred service prevents the phaser from returning to its retard position, leaving the exhaust cam over-advanced.
- 2
Stuck-open Bank 1 exhaust VVT solenoid
An exhaust cam OCV stuck open continuously supplies oil to the phaser advance chamber, holding the cam over-advanced regardless of PCM commands. Inspect the solenoid screen for sludge or debris.
- 3
Worn exhaust cam phaser (Bank 1)
Internal wear allows oil to bypass the phaser's vane seals, preventing it from holding commanded timing. A worn phaser typically produces a ticking or chattering noise at idle.
- 4
Stretched timing chain
A stretched chain allows the exhaust cam to drift toward the advanced position. Even with a functioning phaser and solenoid, a worn chain makes precise timing control impossible.
How to Diagnose It
- 1
Check Low or dirty engine oil — Exhaust cam phasers depend on clean, pressurized oil to move between advance and retard positions. Low oil or sludge from deferred service prevents the phaser from returning to its retard position, leaving the exhaust cam over-advanced.
- 2
Check Stuck-open Bank 1 exhaust VVT solenoid — An exhaust cam OCV stuck open continuously supplies oil to the phaser advance chamber, holding the cam over-advanced regardless of PCM commands. Inspect the solenoid screen for sludge or debris.
- 3
Check Worn exhaust cam phaser (Bank 1) — Internal wear allows oil to bypass the phaser's vane seals, preventing it from holding commanded timing. A worn phaser typically produces a ticking or chattering noise at idle.
- 4
Check Stretched timing chain — A stretched chain allows the exhaust cam to drift toward the advanced position. Even with a functioning phaser and solenoid, a worn chain makes precise timing control impossible.
How to Fix It
- 1
Change the engine oil and filter
An oil and filter change is always the first step for any VVT over-advance code. Fresh oil of the correct viscosity is required for proper phaser hydraulics.
- 2
Inspect and clean the Bank 1 exhaust VVT solenoid
Remove the exhaust cam oil control valve and check its screen for oil sludge or debris. Clean the screen and test solenoid resistance. Replace if contaminated or faulty.
- 3
Verify cam timing with live scanner data
Monitor Bank 1 exhaust cam actual vs. commanded timing with a scan tool. If the cam remains over-advanced and unresponsive to retard commands, the solenoid or phaser needs replacement.
- 4
Replace the Bank 1 exhaust camshaft phaser
If the solenoid and oil are confirmed good but the cam stays over-advanced, the phaser is worn and must be replaced. Use OEM or OEM-equivalent parts.
- 5
Inspect timing chain for wear
If phaser and solenoid checks are normal, evaluate the timing chain and tensioner for stretch or guide wear. Replace as needed.
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