What P0340 means
Diagnostic Trouble Code (DTC) P0340 stands for Camshaft Position Sensor Circuit Malfunction. This is a generic OBD2 diagnostic trouble code indicating that the engine computer (ECU) has registered an operational anomaly in the powertrain (p) systems.
When this error registers, the ECU records a freeze frame of sensor data and lights up the Check Engine Light on your dashboard to notify the operator of a system fault.
Symptoms of OBD2 Code P0340
When code P0340 is active, your car might exhibit the following common symptoms:
- Check Engine Light on
- Engine cranks but will not start
- Intermittent stalling or engine stumbling
- Severe drop in engine power
Common Causes of Code P0340
Faults that trigger this code typically include:
- Cause 1: Failed Camshaft Position (CMP) Sensor
- Cause 2: Damaged or corroded CMP sensor wiring connector
- Cause 3: Weak or discharged car battery
- Cause 4: Broken timing chain/belt teeth
Can you drive with a P0340 code?
No, the vehicle may stall, fail to start, or enter limp-home mode because the engine computer cannot sync injector firing and spark timing with the pistons.
Expected Repair Cost Band
$80 - $250. CMP sensors are typically inexpensive and mounted accessibly on the cylinder head.
Related Diagnostic Trouble Codes
If you have scanned multiple codes, see these related guides for troubleshooting context:
Frequently Asked Questions
Occasionally, the ECU can run on crankshaft backup maps, but it will have long starting cranks and very poor performance.