Camshaft Position Sensor A Circuit High (Bank 2)
What does P0348 mean?
The P0348 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Sensor A Circuit High (Bank 2). This is a critical severity code.
Common Symptoms
- Extended cranking on startup
- Engine stalls without warning
- Check Engine Light illuminated
- Rough idle and misfires on bank 2
- Possible no-start condition
Probable Causes (Ranked by Likelihood)
- Open circuit in bank 2 CMP sensor ground wire Very High
- Faulty CMP sensor on bank 2 (open coil) High
- Short to voltage in CMP sensor signal wire High
- Disconnected or corroded sensor connector Moderate
- PCM input circuit fault Low
Step-by-Step Diagnostic Procedure
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Check bank 2 CMP sensor signal -- a constantly high voltage confirms the fault
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Test ground wire continuity from the sensor connector to PCM
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Check for short to voltage in the signal wire with sensor disconnected
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Inspect the connector for loose, corroded, or heat-damaged pins
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Measure sensor resistance -- an open reading confirms internal failure
Frequently Asked Questions
Can I drive with code P0348?
You can drive short distances if the engine starts. Some vehicles can default to CKP-only operation, but bank 2 will run poorly.
What causes a high CMP sensor circuit?
A high circuit is typically caused by an open ground wire, an internally open sensor coil, or a short to voltage in the signal wiring. The PCM reads a voltage higher than expected.
Can heat damage the CMP sensor wiring?
Yes. CMP sensor wiring routes near hot engine components and can have its insulation degraded over time, causing opens or shorts that trigger high circuit codes.