P0390 Fault Code

Camshaft Position Sensor B Circuit (Bank 2)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0390 fault code indicates an issue with the Camshaft Position Sensor B Circuit on Bank 2 of the engine. This sensor is crucial for monitoring the position of the camshaft, which helps regulate engine timing and performance. When this sensor fails or there is a malfunction in its circuit, the engine control unit (ECU) may not receive accurate information, leading to suboptimal engine operation.

What are the symptoms of the P0390 code?

Symptoms of a P0390 code may include:

• Engine misfires or rough idling.
• Decreased fuel efficiency.
• Illuminated check engine light.
• Difficulty starting the engine or no start condition.
• Decreased engine performance or power.

What causes the P0390 code?

Common causes for the P0390 fault code include:

• A defective camshaft position sensor.
• Damaged wiring or connectors in the sensor circuit.
• Poor connections due to corrosion or dirt.
• Faulty engine control unit (ECU).
• Mechanical issues with the camshaft or timing components.

How to fix P0390?

To resolve a P0390 fault code, follow these steps:

1. Inspect the wiring and connectors for the camshaft position sensor B on Bank 2 for any damage or corrosion.
2. Check the sensor itself for functionality, replacing it if necessary.
3. Clear the fault codes from the vehicle’s computer and perform a test drive to see if the issue recurs.
4. If the problem persists, further diagnose the ECU and timing components to rule out other underlying issues.