Camshaft Position Sensor A Circuit Intermittent (Bank 2)
The P0349 code indicates an intermittent signal from the camshaft position sensor on bank 2 (the side of the engine opposite cylinder #1). This sensor monitors camshaft speed and position, which the engine control module (ECM) uses for fuel injection and ignition timing. An intermittent fault means the signal drops out or is erratic, often due to wiring issues, a failing sensor, or problems with the reluctor ring. This can cause drivability issues and may prevent the engine from starting.
01. Most Common Causes
- Faulty camshaft position sensor (bank 2)
- Damaged or corroded wiring/connector to the sensor
- Intermittent short or open in the sensor circuit
- Damaged reluctor ring or timing chain/belt issues
- ECM software or hardware problem (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced engine power or hesitation
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P0349 and check for related codes.
Step 2: Visually inspect the camshaft position sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage supply (typically 5V reference, ground, and signal) using a multimeter.
Step 4: Monitor the sensor signal with a scope or scan tool while wiggling the wiring harness to reproduce the intermittent fault.
Step 5: If wiring and sensor check out, inspect the reluctor ring and timing components for damage or misalignment.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The intermittent signal can cause stalling or loss of power, which may be dangerous, especially in traffic.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement, or $150-$300 at a shop including labor and diagnostics.