Crankshaft/Camshaft Position Correlation (Bank 1 Intake)
What does P0016 mean?
The P0016 code means the vehicle's onboard diagnostic system has detected: Crankshaft/Camshaft Position Correlation (Bank 1 Intake). This is a serious severity code.
Common Symptoms
- Check Engine Light on
- Hard starting or no-start
- Rough running
- Rattling noise from timing area
- Reduced power
Probable Causes (Ranked by Likelihood)
- Stretched or jumped timing chain Very High
- Worn timing chain tensioner or guides High
- Faulty crankshaft or camshaft position sensor Moderate
- Damaged or slipped reluctor wheel on cam or crank Moderate
- VVT actuator locked in wrong position Low
Step-by-Step Diagnostic Procedure
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Check for a rattling or slapping noise at startup, which strongly suggests a stretched timing chain.
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Use a scan tool to compare crankshaft and camshaft position sensor signals. They should align to spec at idle.
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Inspect timing chain slack through the oil filler cap or timing cover inspection plug if available.
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Check the crankshaft and camshaft position sensor wiring for damage or poor connections.
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If chain appears OK, test both sensors: compare reluctor ring count and signal pattern.
Frequently Asked Questions
Is P0016 serious?
Yes. A timing chain that has jumped even one tooth can cause the engine to run poorly or not at all. If the chain jumps further, valve-to-piston contact may occur on interference engines, causing severe internal damage.
How do I know if the timing chain is stretched?
A metallic rattling on cold startup that quiets as oil pressure builds is the classic sign. Confirm with a scan tool by checking actual versus target cam timing at idle.