P0343: Camshaft Position Sensor Circuit High Input
Can you still drive? The engine may run, but poorly. If it causes a no-start condition, the vehicle will need to be towed for repair.
What Does P0343 Mean?
Code P0343 means the camshaft position sensor is sending a signal voltage higher than the ECM expects. This usually points to a wiring short, failed sensor, or incorrect sensor part. The ECM may not be able to properly synchronize fuel injection and ignition 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
- Short to power in camshaft sensor wiring
- Internally failed camshaft sensor
- Incorrect sensor installed
- Damaged wiring harness
- Faulty ECM input circuit
Symptoms
- Check engine light on
- Hard starting or no-start
- Rough idle
- Engine runs poorly
- Variable valve timing malfunction
Diagnostic Steps
- 1Measure camshaft sensor circuit voltage with key on, engine off
- 2Inspect wiring for shorts to battery or other power sources
- 3Verify correct sensor part number
- 4Disconnect sensor and check if voltage drops to zero
- 5Inspect wiring harness routing for chafing against brackets
Recommended Parts & Tools
camshaft position sensor
wiring harness repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $350 |
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Chat with AI About P0343Commonly Affected Vehicles
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Frequently Asked Questions
Can a wrong camshaft sensor cause P0343?
Yes, installing the wrong part number can produce incorrect voltage outputs. Always verify the sensor matches your exact engine and model year.
Does P0343 affect variable valve timing?
Yes, the camshaft position sensor is essential for VVT operation. A faulty signal can disable VVT, reducing power and fuel economy.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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