P0394 Code - Camshaft Position Sensor 'B' Circuit Intermittent Bank 2

What Does P0394 Mean?

The PCM has detected an incorrect voltage reading or waveform from the camshaft position sensor circuit for camshaft sensor “B” in engine bank 2. The camshaft position sensor is a stationary electro-magnetic sensor that works in conjunction with teeth or notches on the camshaft. The teeth or notches on the camshaft interrupt the sensor’s magnetic field (as perceived by the PCM) to input camshaft position data. This data is used in calculating fuel delivery and ignition timing.

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What are the common causes of P0394 ?

• 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 P0394 ?

In order to repair the cause of the P0394, there are many things that a mechanic should do in order to properly diagnose and address the issue. These steps may include:

• Inspecting and repairing all electrical components during the initial diagnosis.
• Replacing a faulty camshaft position sensor.
• Addressing a leak in oil or engine fluids, and replacing any wiring or electrical components that were affected by the leak.
• Repairing or replacing open or shorted camshaft position sensor.
• Recharging or replacing a dead or weakened battery.
• Replacing a faulty starting system circuit.
• Repairing or replacing a faulty starter motor.
• Replacing a faulty PCM in very rare cases.

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