Camshaft Position Sensor Circuit High (Bank 2)
The P0393 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the camshaft position sensor on Bank 2 that is higher than the expected range. This sensor monitors the position of the camshaft relative to the crankshaft to optimize fuel injection and ignition timing. A high circuit condition can be caused by a faulty sensor, wiring issues, or a problem with the ECM. This code is specific to Bank 2, which is the side of the engine opposite cylinder #1.
1. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded or loose electrical connections
- Failed Engine Control Module (ECM)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced engine power and fuel economy
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the camshaft position sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground circuits with a multimeter; compare to manufacturer specifications.
Step 4: If circuits are okay, replace the camshaft position sensor on Bank 2.
Step 5: Clear the code and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine performance issues and potential damage. You may experience stalling or reduced power, which can be unsafe.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.