21-017-21

Power Transfer Unit (PTU) Broken Input Spline - X89 Warranty Extension This bulletin involves replacing the PTU assembly with an updated part. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P1720-00 - Output Speed Sensor-Wheel Speed Rationality. P215C-00 - Output Shaft Speed Wheel Speed Correlation. The customer may also describe one or more of the following:Grinding noise coming from under the vehicle while driving. Vehicle will not move.