Camshaft Position Sensor A Circuit Low (Bank 1 or Single Sensor)
What does P0342 mean?
The P0342 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Sensor A Circuit Low (Bank 1 or Single Sensor). This is a critical severity code.
Common Symptoms
- Engine cranks but may not start
- Engine stalls intermittently
- Check Engine Light illuminated
- Rough running and misfires
- Extended crank time on startup
Probable Causes (Ranked by Likelihood)
- Short to ground in CMP sensor signal wiring Very High
- Faulty camshaft position sensor High
- Corroded or damaged CMP sensor connector High
- Oil leak contaminating sensor and connector Moderate
- PCM CMP input circuit failure Low
Step-by-Step Diagnostic Procedure
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Check CMP sensor signal voltage with a scan tool -- consistently low readings confirm a circuit fault
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Test for shorts to ground in the CMP sensor signal wire with sensor disconnected
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Inspect the sensor connector for oil contamination, corrosion, or pushed-back pins
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Check the 5V reference voltage at the sensor connector (Hall effect type)
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Replace the CMP sensor if signal output is below specification after wiring checks pass
Frequently Asked Questions
Can I drive with code P0342?
You can drive short distances, but the engine may stall or have trouble starting. The PCM relies on the CMP sensor for fuel injection sequencing.
Can an oil leak cause P0342?
Yes. Oil leaking from the valve cover or cam seals can seep into the CMP sensor connector, shorting the signal to ground and causing a low circuit reading.
Where is the camshaft position sensor located?
The CMP sensor is typically located on the cylinder head near the camshaft, often at the front or rear of the engine. On some engines it is mounted in or near the valve cover.