2019 GMC P0340: What It Means & Is It Safe to Drive?
P0340 on the 2019 GMC: Camshaft Position Sensor Circuit Malfunction. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
The PCM is not receiving a valid signal from the camshaft position sensor. Affects ignition timing and fuel injection.
Common causes on the 2019 GMC
- Failed camshaft position sensor
- Wiring or connector issue
- Timing chain/belt misalignment (less common)
Symptoms
- Check Engine Light
- No start or hard start
- Rough run, stalling
- Reduced power
Typical fixes
- Replace camshaft position sensor
- Repair wiring/connector
- Verify timing if sensor replacement doesn't fix
Repair cost range
For a 2019 GMC, repairs for P0340 typically fall between $100 and $500, depending on the root cause and labor rates in your area.
Known issues on GMC
GMC P0340 cam sensor fault on the 5.3L LS V8 is typically a failed sensor or worn reluctor ring. On the Terrain 2.4L Ecotec, P0340 alongside a timing rattle at startup suggests timing chain stretch is the root cause rather than the sensor itself.
Most commonly affected models
Sierra 5.3L LS 2007–2014Acadia 3.6L 2007–2016Terrain 2.4L 2010–2017