Crankshaft Position - Exhaust Camshaft Position Correlation (Bank 2)
What does P0018 mean?
The P0018 code means the vehicle's onboard diagnostic system has detected: Crankshaft Position - Exhaust Camshaft Position Correlation (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough idle and engine vibration
- Reduced power and hesitation during acceleration
- Hard starting, especially when warm
- Rattling noise from timing chain area
Probable Causes (Ranked by Likelihood)
- Stretched or worn timing chain Very High
- Faulty exhaust VVT solenoid (bank 2) High
- Low or degraded engine oil High
- Worn timing chain tensioner or guides Moderate
- Faulty crankshaft or camshaft position sensor Low
Step-by-Step Diagnostic Procedure
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Check engine oil level and quality. Low or contaminated oil will cause VVT system malfunctions. Change oil if needed.
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Use a scan tool to compare crankshaft position to exhaust camshaft position on bank 2. More than 5 degrees of deviation indicates a timing correlation issue.
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Listen for timing chain rattle on cold start -- a brief rattle that fades suggests a worn tensioner. Persistent rattle indicates a stretched chain.
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Inspect the bank 2 exhaust VVT solenoid. Remove and check for debris or sludge in the oil screen. Measure resistance (typically 6-13 ohms).
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If the chain is suspected, perform a timing chain slack test or remove the timing cover to visually inspect chain, tensioner, and guides for wear.
Frequently Asked Questions
Can I drive with code P0018?
You can drive short distances to a repair shop, but avoid hard acceleration. If you hear timing chain rattle or experience significant power loss, have the vehicle towed instead to prevent potential engine damage.
Is P0018 related to P0017?
Yes. P0017 indicates intake camshaft correlation issues on bank 2, while P0018 indicates exhaust camshaft correlation issues on bank 2. Both often appear together when a timing chain is stretched.
How much does a timing chain replacement cost?
Timing chain replacement typically costs $800 to $1,500 for parts and labor. The chain itself is inexpensive ($50-$150), but labor is extensive since the front of the engine must be disassembled to access it.