P0340: Camshaft Position Sensor Circuit Malfunction
Can you still drive? Not recommended if the engine is stalling or will not start. If the engine runs, drive carefully to a repair shop.
What Does P0340 Mean?
Code P0340 indicates that the engine control module is not receiving a valid signal from the camshaft position sensor. This could mean the sensor has failed completely, there is a wiring problem, or the sensor's power supply is missing. Without this signal, the ECM may not be able to determine proper fuel injection timing.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed camshaft position sensor
- Broken or corroded wiring
- Damaged sensor connector
- Faulty ECM signal circuit
- Blown fuse powering sensor
Symptoms
- Check engine light on
- Engine cranks but will not start
- Intermittent stalling
- Rough idle
- Loss of power
Diagnostic Steps
- 1Verify sensor has power and ground with multimeter
- 2Check sensor connector for corrosion or damage
- 3Test sensor output signal while cranking
- 4Inspect wiring harness for breaks or shorts
- 5Check related fuses
- 6Test with known-good sensor if available
Recommended Parts & Tools
camshaft position sensor
wiring repair kit
electrical connector cleaner
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $75 - $500 |
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Chat with AI About P0340Commonly Affected Vehicles
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Frequently Asked Questions
Can my car run without a camshaft position sensor?
Some vehicles can run in a limp mode without the cam sensor signal, but performance will be significantly reduced. Others may not start at all.
How much does a camshaft position sensor cost?
The sensor itself typically costs $20-$100 for the part. Labor for replacement is usually 30 minutes to 2 hours depending on the vehicle.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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