P0349
Camshaft Position Sensor A Circuit Intermittent (Bank 2)
If your vehicle's onboard computer has flagged the diagnostic trouble code P0349, it refers to a detected anomaly regarding "Camshaft Position Sensor A Circuit Intermittent (Bank 2)". This systemic engine fault needs a targeted check before symptoms expand.
Driver's Summary
Code P0349 means your vehicle detected a problem with the camshaft position sensor a circuit intermittent (bank 2) system. In practice, this fault causes intermittent power loss, check engine light flashes. Given the high severity of this code, continuing to drive risks significant mechanical damage. Have it diagnosed immediately.
Symptoms
Intermittent power loss, check engine light flashes
Common Causes
- Loose connector on Bank 2 sensor
- Wiring harness chafing
- Internally failing sensor
- Alternator voltage spikes
How to Fix
- 1 Secure and clean connector
- 2 Repair wiring harness
- 3 Replace camshaft position sensor
- 4 Test alternator output
Technical Explanation
The ECM detects code P0349 by continuously monitoring the relevant sensor circuit against calibrated threshold values stored in its non-volatile memory. The PCM monitors crankshaft rotational velocity via the CKP sensor at a resolution of individual tooth gaps on the reluctor ring. A combustion event in each cylinder produces a measurable acceleration spike; its absence or weakness is flagged as a misfire event within a 200-revolution or 1000-revolution test window. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
Driving with an active P0349 fault risks accelerating damage to loose connector on bank 2 sensor and related components. The longer the fault persists, the more expensive the eventual repair becomes — what starts as a sensor or solenoid issue can escalate to major mechanical failure.
Mechanic's Pro Tip
The most common mistake with P0349 is replacing the sensor without verifying the reference voltage and ground integrity first. Use a scan tool to monitor the sensor's live output; a truly failed sensor shows a stuck, flatlined reading — a sensor that fluctuates but reads slightly off usually indicates a wiring or vacuum issue, not a dead sensor. Always spray electrical contact cleaner on the connector pins before condemning the sensor.
Wiring repair: 100; Sensor replacement: 150 - 250