P0344 Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)

P0344 indicates an intermittent camshaft position sensor A circuit fault on bank 1 or a single-sensor setup. The cam signal drops out or becomes implausible at times.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear intermittent cam signal faults without a heat and vibration check; they can cause stalls or no-starts.

Symptoms of P0344

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0344

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Monitor cam signal, cam/crank sync, and RPM while moving the harness and repeating freeze-frame conditions.
Inspect cam sensor connector fit, terminal tension, wiring near heat or oil leaks, and sensor mounting.
Review recent timing, valve-cover, or cam sensor service that may have disturbed wiring.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.