P0348 critical

Camshaft Position Sensor A Circuit High (Bank 2)

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.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $80 - $350 (parts and labor)

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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

Check bank 2 CMP sensor signal -- a constantly high voltage confirms the fault
Test ground wire continuity from the sensor connector to PCM
Check for short to voltage in the signal wire with sensor disconnected
Inspect the connector for loose, corroded, or heat-damaged pins
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.