P0340High urgency
Camshaft Position Sensor A Circuit Malfunction (Bank 1)
Engine · Timing
⛔ Car may not start — fix immediately.
What this means
The camshaft position sensor is not sending a valid signal. Critical for fuel injection timing. Engine may stall or not start.
Likely causes
- Failed camshaft position sensorMost common
- Damaged reluctor ringCommon
- Timing chain jumpedLess common
Estimated repair cost
CMP sensor replacement$100 – $300
Wiring harness repair$75 – $200
Timing chain service$500 – $1,500
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Frequently asked questions
What does P0340 mean?
The camshaft position sensor is not sending a valid signal. Critical for fuel injection timing. Engine may stall or not start.
Is P0340 serious?
Car may not start — fix immediately.
How much does it cost to fix P0340?
Repair costs for P0340 range from $100 – $300 depending on the root cause and your vehicle.
Can I drive with P0340?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.