P0344: The camshaft position sensor signal is cutting in and out
Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)
The camshaft position sensor signal cuts in and out, and the engine can stall without warning. Get it checked today. If it stalls, have it towed.
Stop driving and get help if
- The check engine light is flashing
- The temperature gauge runs high, or you see steam (overheating)
- The car loses power, hesitates badly or stalls
- You smell burning or see smoke
- A brake warning light comes on, or the brakes feel different
Pull over as soon as you can, turn the engine off, and call a tow or roadside help.
What it means
The camshaft position sensor feeds the engine computer a continuous signal so it can time fuel injection and spark. P0344 means that signal has been dropping out. It comes back, which is why the car may run fine most of the time, but the computer logged the dropout. Intermittent codes are often harder to diagnose than steady ones because the fault hides when a technician looks for it. The connector is the first place to check, not the sensor itself.
Common causes
- Loose or corroded camshaft sensor connectorThe most common cause. Vibration works the connector loose over time.
- Damaged wiring, especially near heat sourcesWires routed near the exhaust can crack insulation, causing intermittent contact.
- Failing camshaft position sensorInternal failure can be heat-activated, making it hard to catch when cold.
- Weak connection at the PCMLess common but worth checking if wiring and sensor test clean.
What the fix could involve
From the cheaper fix to the bigger one. Prices depend on your car, your area and the shop, so ask for a written quote that names the part and the labor before you approve it.
- Connector repair or pigtail replacement
- Camshaft position sensor replacement
- Wiring harness repair
Symptoms
- Engine stalls unexpectedly and may restart
- Rough idle that comes and goes
- Hesitation or stumble during acceleration
- Hard starting after the car warms up
- Check engine light on, sometimes accompanied by multiple misfire codes
What to do next
Start with the connector. Unplug it, inspect for green corrosion or pushed-back terminals, and reseat it firmly. If the car is stalling, do not delay diagnosis. A technician can wiggle-test the harness while monitoring the live sensor signal to catch the dropout. Replace the sensor only after ruling out wiring.
Lewis reads P0344 alongside any related cam sensor codes, stored or pending, and saves them to your scan history, so you can show your technician the exact codes. Get Lewis on the App Store or Google Play.
Related codes
FAQ
- Why does my car run fine most of the time?
- Intermittent faults only appear under specific conditions, like heat or vibration. The dropout may be brief but it is real and can get worse.
- Can I clear the code and see if it comes back?
- You can, but the underlying cause is still there. If the car stalls in traffic before the code returns, that is a real safety risk.
- Is this the same problem as P0341?
- P0341 is an out-of-range signal. P0344 is an intermittent one. Both need diagnosis, but P0344 more often points to wiring or the connector.
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