BREATHER GP 3948105 - Caterpillar

This diagnostic code becomes active when the software detects that the object detection sensor has the incorrect internal resistance. The sensor has a software key that is sent to the display during start-up of the system.Note: For Small Off-Highway Truck, this code corresponds with the front object detection sensor. For Motor Graders and Wheel Loaders, this code corresponds with the rear right object detection sensor.System Response:The object detection system is disabled. The status indicator for the system will illuminate red. The system will reactivate when the proper key is received from the object detection sensor.Test Step 1. CHECK THE PART NUMBER OF THE SENSOR
Check the part number of the sensor that was replaced.Expected Result:The sensor part number should be the same as the sensor that was replaced.Results:
YES - Possible internal sensor failure. Contact your Technical Communicator for a possible consultation with Caterpillar.STOP
NO - The sensor is a different part number.Repair: Replace the sensor with the correct part number.STOP