Camshaft Position Sensor Circuit Malfunction (Bank 2)
The P0390 code indicates a problem in the electrical circuit of the camshaft position sensor on bank 2 (the side of the engine opposite cylinder #1). The sensor monitors camshaft speed and position, sending signals to the PCM for fuel injection and ignition timing. A circuit fault can be caused by wiring issues, a faulty sensor, or a damaged connector. This code may trigger the check engine light and affect engine performance.
1. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Damaged or corroded wiring/connector to the sensor
- Open or short circuit in the sensor signal circuit
- Engine control module (PCM) failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may run rough or misfire
- Hard starting or stalling
- Reduced fuel economy and power
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the camshaft position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter per manufacturer specs.
Step 4: Check for continuity and shorts in the circuit between sensor and PCM.
Step 5: Replace sensor if faulty; clear codes and test drive.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the engine may stall or run poorly, potentially causing further damage.
How much does it cost to fix?▼
Replacing the camshaft position sensor typically costs $50-$150 for parts and labor, depending on vehicle make and model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.