P0340 Code: Camshaft Position Sensor Circuit Malfunction
🟠 Moderate severity · drivable
Drivable if the engine runs, but a failing camshaft sensor can cause stalling or a no-start, so replace it soon.
What P0340 means
The engine computer is getting no signal or an invalid signal from the camshaft position sensor. This sensor tells the computer the camshaft's position so it can time fuel injection and ignition.
Symptoms
- Check engine light is on
- Hard starting or no-start
- Engine stalling
- Rough running or misfiring
Common causes
- most common: Faulty camshaft position sensor
- common: Damaged wiring or loose connector at the sensor
- less common: Timing chain or belt problem
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the camshaft sensor connector | Yes | $0–10 |
| Replace the camshaft position sensor | Yes | $50–150 |
| Repair damaged sensor wiring | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0340 code?
Maybe, but the engine could stall or fail to start. Replace the sensor soon.
What is the most common cause of P0340?
A faulty camshaft position sensor. It's usually an inexpensive, easy-to-reach part.
How much does it cost to fix a P0340?
Typically $50–$150 for a new camshaft position sensor.
Related codes
P0341
P0341 Code: Camshaft Position Sensor A Circuit Range/Performance
P0335P0335 Code: Crankshaft Position Sensor Circuit Malfunction
P0016P0016 Code: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.