2023 GMC P0340: What It Means & Is It Safe to Drive?
P0340 on the 2023 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.
PowertrainHigh urgency
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 2023 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 2023 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