Severity: Moderate
Drivable, but it can cause more damage or poor economy. Get it checked within days.
What P0340 means
The computer is not seeing a valid camshaft position signal.
Symptoms
- Long crank before starting
- Stalling
- Reduced power
Common causes
Most likely first
- 1Failed cam sensor
- 2Wiring or connector fault
- 3Timing chain stretched or jumped
How we diagnose it
- Scope cam and crank signals together
- Inspect wiring
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.