Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)
What does P0344 mean?
The P0344 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor). This is a moderate severity code.
Common Symptoms
- Intermittent engine stalling
- Random misfires
- Check Engine Light comes on and off
- Extended cranking on some startups
- Engine hesitates intermittently
Probable Causes (Ranked by Likelihood)
- Loose or corroded CMP sensor connector Very High
- Intermittent break in CMP sensor wiring High
- CMP sensor failing under heat High
- Oil contamination causing intermittent signal disruption Moderate
- Worn cam reluctor wheel causing intermittent signal gaps Low
Step-by-Step Diagnostic Procedure
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Wiggle-test the CMP sensor connector while monitoring signal on a scan tool
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Test sensor resistance when cold and hot to check for thermal failure
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Inspect for oil leaks that may intermittently contaminate the sensor connector
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Monitor CMP waveform during a road test with an oscilloscope to capture the intermittent fault
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Replace the sensor and repair wiring if damage is found
Frequently Asked Questions
Can I drive with code P0344?
You can drive short distances, but the engine may stall intermittently. Be prepared for occasional rough starting or hesitation. Repair soon to avoid being stranded.
Can a valve cover gasket leak cause P0344?
Yes. A leaking valve cover gasket can allow oil to reach the CMP sensor connector, causing intermittent signal disruption. Fixing the oil leak is often part of the repair.
How do I tell if the CMP sensor or wiring is the problem?
Wiggle testing while monitoring the signal helps. If the signal drops when the connector or wiring is moved, the wiring is likely at fault. If the fault only occurs when hot, the sensor is likely failing.