What does it mean?
This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.
This P0390 trouble code indicates a problem has been detected in the Bank 2 camshaft position sensor circuit.
Since it says circuit, this means the problem could be in any part of the circuit – the sensor itself, the wiring, or the PCM. Don’t just replace the CPS (camshaft position sensor) and assume that will definitely fix it.
Note: The “B” camshaft sensor is typically the sensor on the exhaust camshaft. This code is basically identical to P0345, but refer to a vehicle-specific repair manual to identify the correct sensor on your vehicle/engine.
Symptoms
Symptoms may include:
Hard starting or no start
Rough running/misfires
Loss of engine power
Causes
A P0390 code could mean one or more of the following has occurred:
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 is an open circuit
The crankshaft position sensor may have failed
Possible Solutions
With a P0390 OBD-II trouble code, diagnosis can sometimes be tricky. Here are some things to try:
Visually inspect all wiring and connectors in the circuit
Check continuity of the circuit wiring
Check operation (voltage) of the camshaft position sensor
Replace the required BS camshaft position sensor
Also check the crankshaft position circuit
Replace circuit wiring and/or connectors as needed
Diagnose/replace PCM as required