P0390 Camshaft Position Sensor "B" Circuit (Bank 2) Trouble Code

P0390 Camshaft Position Sensor Trouble Code

Technical Description

Camshaft Position Sensor B Circuit Malfunction (Bank 2)

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.

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.

Symptoms

Symptoms can include:

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

Causes

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

Possible Solutions

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

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