P0391 - Camshaft Position Sensor 'B' Circuit Range/Performance (Bank 2)

System Information

The ECM uses the Camshaft Position Sensor to calculate the angular position of the Camshaft. This information can then be used by the ECM to control Fuel Injection, Ignition Timing and Variable Valve Timing Systems.

This fault code indicates that the value received by the ECM from the Camshaft Position Sensor is incorrect for the current operating conditions. The Sensor output may not be responding as expected or may not match expected values for the current operating conditions.

Recommended Tests

It is recommended to check the following systems and components.

Checks should include sensor outputs, wiring and physical checks of teeth / rotors on the Camshaft pulley