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). This sensor monitors the position and speed of the camshaft to help the engine control module (ECM) manage ignition timing and fuel injection. A circuit fault can be caused by a damaged sensor, wiring issues, or a poor electrical connection. If left unresolved, it may lead to poor engine performance, stalling, or difficulty starting.
01. Most Common Causes
- Faulty camshaft position sensor (Bank 2)
- Damaged or corroded wiring/connectors in the sensor circuit
- Open or short circuit in the sensor signal or power/ground wires
- Faulty engine control module (ECM) (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Hard starting or stalling
- Reduced engine power or poor acceleration
03. Step-by-Step Diagnosis
Step 1: Connect an OBD2 scanner to confirm code P0390 and check for additional codes.
Step 2: Visually inspect the camshaft position sensor connector and wiring on Bank 2 for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage supply using a multimeter; compare with manufacturer specifications.
Step 4: If sensor and wiring are okay, test the circuit continuity from the sensor to the ECM; repair or replace as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0390, as it can cause engine stalling or poor performance. You may be able to drive short distances to a repair shop, but avoid heavy acceleration or high speeds.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs are needed or if the sensor is difficult to access.