What Does P0349 Mean?
The ECM has detected an intermittent signal from the camshaft position sensor A on Bank 2, meaning the signal randomly drops out or produces unexpected transitions during engine operation. This typically manifests as momentary signal loss that recovers on its own, often correlated with engine temperature, RPM, or vibration. The Bank 2 cylinders may experience random misfires or momentary timing disruptions.
Common Causes
35%
Intermittent electrical connection at the Bank 2 CMP sensor connector due to worn terminal tension, spread pins, or oil contamination
30%
CMP sensor A (Bank 2) with temperature-dependent internal failure, functioning when cold but failing at operating temperature
20%
Intermittent open in the CMP sensor wiring harness from a broken conductor inside intact insulation, flexing with engine movement
15%
Excessive sensor-to-reluctor air gap on Bank 2 from cam bearing wear or loose sensor mounting
Diagnostic Steps
1
Monitor the Bank 2 CMP sensor signal on an oscilloscope during extended idle and driving. Look for signal dropouts, glitches, or amplitude changes that correspond to temperature increases or RPM changes.
2
Perform a thorough wiggle test on the Bank 2 CMP sensor connector and harness while monitoring signal. Flex the harness at stress points near harness clamps, connector boots, and where it crosses engine mounts.
3
Check CMP sensor mounting torque and air gap. A loose mounting bolt allows vibration-induced gap variation. Typical mounting torque is 8-12 Nm and air gap should be 0.5-1.5mm.
4
Apply heat (180-220°F from heat gun) to the CMP sensor while monitoring signal output. Temperature-sensitive sensors will show signal degradation or dropout as they heat up.
5
Inspect Bank 2 valve cover area for oil leaks that could be wicking into the CMP sensor connector. Even small amounts of engine oil can compromise terminal contact integrity over time.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
The ECM has detected an intermittent signal from the camshaft position sensor A on Bank 2, meaning the signal randomly drops out or produces unexpected transitions during engine operation. This typically manifests as momentary signal loss that recovers on its own, often correlated with engine temper...
The most common cause of P0349 (Camshaft Position Sensor A Circuit Intermittent (Bank 2)) is: Intermittent electrical connection at the Bank 2 CMP sensor connector due to worn terminal tension, spread pins, or oil contamination
Typical repair costs for P0349 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent CMP signal dropout can cause momentary engine stumbles or hesitation without warning, which can be hazardous in situations requiring immediate throttle response such as passing or merging.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0349 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Timing / Variable Valve Timing
Difficulty
Type
Generic (SAE)
Recommended Tools
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