Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
What does P0346 mean?
The P0346 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Sensor A Circuit Range/Performance (Bank 2). This is a moderate severity code.
Common Symptoms
- Engine runs rough on bank 2
- Check Engine Light illuminated
- Hard starting
- Reduced power
- Poor fuel economy
Probable Causes (Ranked by Likelihood)
- Stretched or jumped timing chain on bank 2 Very High
- Faulty camshaft position sensor on bank 2 High
- Worn timing chain tensioner on bank 2 Moderate
- Damaged cam reluctor wheel Moderate
- Variable valve timing (VVT) actuator malfunction Low
Step-by-Step Diagnostic Procedure
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Compare bank 2 CMP timing to CKP timing with a scan tool -- deviation indicates timing issue
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Inspect the bank 2 timing chain for stretch by checking timing marks alignment
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Check the VVT actuator operation if equipped -- use scan tool to command actuator and verify response
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Test CMP sensor output waveform for consistency
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If timing chain is stretched, inspect guides and tensioner before replacing
Frequently Asked Questions
Can I drive with code P0346?
You can drive short distances, but if the timing chain has jumped, continued driving on an interference engine risks bent valves and catastrophic engine damage.
Can the VVT system cause P0346?
Yes. A malfunctioning VVT actuator can shift camshaft timing outside the expected range, triggering this code even if the timing chain is not stretched.
How can I tell if the timing chain is stretched?
A mechanic can compare CMP to CKP sensor timing correlation with a scan tool. A physical inspection involves removing the timing cover and checking chain slack and timing mark alignment.