P0390 Camshaft Position Sensor B Circuit Bank 2

Definition: The P0390 code indicates a malfunction in the camshaft position sensor “B” circuit on bank 2. This sensor is responsible for monitoring the position of the camshaft and sending this information to the engine control module (ECM) to ensure proper timing of fuel injection and ignition.

p0390 – Camshaft Position Sensor B Circuit Bank 2

Severity: Moderate

Common Causes

P0390 – Camshaft Position Sensor “B” Circuit Bank 2

Common causes of P0390:

• Faulty camshaft position sensor
• Wiring issues such as frayed or corroded wires
• Poor electrical connection to the camshaft position sensor
• Engine timing issues
• Issues with the camshaft phaser or actuator

Common Misdiagnosis

OBD2 Code: P0390

Description: Camshaft Position Sensor B Circuit Bank 2

Common Misdiagnosis: Replacing the camshaft position sensor without checking for wiring issues or problems with the timing chain/belt.

Common Diagnostic Steps

OBD2 Code: P0390

Description: Camshaft Position Sensor B Circuit Bank 2

• Check for any additional trouble codes that may be present.
• Inspect the camshaft position sensor and its wiring for damage or disconnection.
• Test the voltage and ground signals at the camshaft position sensor connector using a multimeter.
• Verify the integrity of the camshaft position sensor circuit by checking for continuity between the sensor and the engine control module (ECM).
• Examine the timing chain or belt for proper alignment and wear, as misalignment can affect sensor readings.
• If equipped, inspect related components such as variable valve timing (VVT) solenoids for proper operation.
• Replace the camshaft position sensor if it is found to be faulty after testing.
• If all else fails, consider reprogramming or replacing the ECM if no other faults are found but code persists.