P0390: Camshaft Position Sensor B Circuit Malfunction (Bank 2)

What Does The P0390 Code Mean?

This P0390 trouble code indicates that a problem was detected in the camshaft position sensor circuit of bank 2.

Since it says circuit, that means the problem could lie in any part of the circuit – the sensor itself, the wiring, or the PCM. Don’t just replace the CPS (camshaft position sensor) and think that will definitely fix it.

Note: The camshaft sensor “B” is generally the sensor on the exhaust camshaft. This code is basically identical to P0345, however refer to a vehicle specific repair manual to identify the correct sensor on your vehicle/engine.

What Are The Symptoms Of The P0390 Code?

Symptoms can include:

• Hard starting or no start
• Rough running / misfiring
• Loss of engine power

What Are The Potential Causes Of The P0390 Code?

A code P0390 could mean one or more of the following has happened:

• a wire or connector in the circuit could be grounded/shorted/broken
• the camshaft position sensor may have failed
• the PCM may have failed
• there exists an open circuit
• the crankshaft position sensor may have failed

How Can You Fix The P0390 Code?

With a P0390 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Visually inspect all the wiring and connectors in the circuit
• Check for continuity in the circuit wiring
• Check the operation (voltage) of the camshaft position sensor
• Replace the camshaft position Sensor Bs required
• Check the crankshaft position circuit as well
• Replace circuit wiring and/or connectors as required
• Diagnose/replace the PCM as required

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Camshaft Position Sensor
>>> Crankshaft Position Sensor
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> ECU

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

Reference Sources

ENGINE CONTROL SYSTEM [GASOLINE ENGINE (V-6)] SERVICE MANUAL for P0390 – Pages 538-540.