P0349
UniversalCamshaft Position Sensor A Circuit Intermittent (Bank 2)
The engine computer has detected an intermittent signal in the Bank 2 camshaft position sensor A circuit. This sensor reports camshaft position so the computer can coordinate engine operation and compare camshaft and crankshaft signals. A signal that drops out or becomes erratic may affect starting, smooth running, or power, though the code alone does not prove the sensor itself has failed.
⚠️ Before You Begin (Safety First)
If the engine stalls, runs very roughly, or loses power, pull over safely and arrange assistance rather than continuing to drive. If it runs normally, drive cautiously and have the fault checked soon; symptoms and risk depend on the vehicle.
Common Symptoms
- The check-engine light may be on, sometimes with other related codes.
- Starting may take longer or the engine may fail to start if the signal interruption affects engine synchronization.
- The engine may run roughly, hesitate, or lose power when the signal becomes unreliable.
- The engine may stall if the interruption is severe or occurs while driving.
- There may be no noticeable symptoms if the interruption is brief or intermittent.
Common Causes
- An intermittent fault within the camshaft position sensor A on Bank 2.
- A loose, damaged, contaminated, or corroded connector or wiring in the sensor circuit.
- Wiring that intermittently opens, shorts, or loses a reliable connection due to damage or movement.
- A problem with the camshaft signal target or related mechanical timing that disrupts the expected signal.
- An intermittent connection or signal-processing problem elsewhere in the circuit.
Diagnostic Steps
- Note when the warning light appeared and whether there were starting, stalling, rough-running, or power-loss symptoms; this context helps guide diagnosis.
- With the engine off and cool, visually inspect accessible wiring and connectors for looseness, damage, corrosion, or signs of rubbing. Do not pull on wires or probe connector terminals.
- Check for other stored codes with a scan tool and record them before clearing anything; related codes can help identify whether the issue involves wiring, synchronization, or another system.
- Use the vehicle's service information to identify Bank 2 and sensor A before inspecting further, since their locations vary by engine.
- If the code returns or the symptoms continue, arrange electrical and signal testing rather than replacing the sensor based on the code alone.
When to Call a Professional
A technician can review stored and related codes and scan data, inspect the Bank 2 sensor A circuit and connectors, and check the signal while the fault is occurring. If needed, waveform comparison with the crankshaft signal and checks of the signal target and mechanical timing can help distinguish an electrical interruption from a sensor or engine-timing problem. Exact tests depend on the vehicle's service information.
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Commonly Asked Questions
Does P0349 mean the camshaft position sensor must be replaced?
No. It identifies an intermittent condition in the Bank 2 sensor A circuit, which may result from the sensor, wiring, connectors, signal target, or a related timing issue. Diagnosis is needed before choosing a repair.
What does “intermittent” mean in this code?
The computer detected a signal that was not consistently reliable. The fault may come and go, so symptoms or scan readings may not be present every time the vehicle is checked.
Can I keep driving with P0349?
If the engine runs normally, cautious short-term driving may be possible, but have the fault checked soon. Stop safely and arrange assistance if the engine stalls, runs very roughly, or loses power.
Is Bank 2 sensor A always in the same place?
No. Bank and sensor locations depend on the engine design. Use vehicle-specific service information to identify the correct component.
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