P0390 Code - Camshaft Position Sensor 'B' Circuit Bank 2

What Does P0390 Mean?

When the P0390 code is stored, it indicates that the PCM has detected an abnormal or incorrect voltage reading from sensor “B” on the camshaft position sensor circuit in engine bank 2. An electro-magnetic sensor, when sensor “B” is working properly, the teeth on the camshaft will interrupt its magnetic field, giving the PCM data about the camshaft’s position. The PCM then uses this data to calculate ignition timing and fuel delivery. If the input is incorrect, these systems cannot get the proper calculations.

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What are the common causes of P0390 ?

• Defective camshaft sensor or crankshaft sensor (some manufacturers recommend that these sensors are replaced as a set)
• Open or shorted wiring to the camshaft sensor
• Corroded or fluid soaked connector/camshaft sensor
• Faulty PCM or PCM programming error

How do you troubleshoot P0390 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

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