What does code P0340 mean on a Mercedes-Benz and is it safe to drive?
P0340: Camshaft Position Sensor Circuit Malfunction. Here's what it means on your Mercedes-Benz, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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 for your Mercedes-Benz
- 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 Mercedes-Benz, repairs for P0340 often fall between $100 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Mercedes-Benz
Mercedes M272 P0340 cam sensor fault on Bank 1 is a strong indicator of the balance shaft gear issue affecting intake cam timing correlation. Have the balance shaft gear inspected before assuming a sensor failure. A healthy M272 rarely develops cam sensor failures without the balance shaft being involved.
Most commonly affected models