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 PCM 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 timing chain problems. This can cause poor engine performance, stalling, or difficulty starting.
1. 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
- Timing chain/belt slippage or stretched chain
- Engine mechanical issues (e.g., worn camshaft)
2. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced fuel economy and power
3. 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: If wiring and sensor check out, inspect timing chain/belt tension and alignment; a stretched chain can cause intermittent signal.
4. 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 is dangerous, especially at highway speeds. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement. If the timing chain needs repair, costs can exceed $1,000. Professional diagnosis is advised.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.