A Service All Wheel Drive message may be displayed on the Driver Information Center in some 2020-2023 Encore GX and 2021-2023 Trailblazer models equipped with the 1.3L engine (RPO L3T) and 9T45 automatic transmission (RPO M3F). The message may be caused by the Rear Axle Differential Lock Control Actuator. (Fig. 7)
Fig. 7
Verify the Rear Differential Clutch Control Module (RDCM) has the latest calibrations. In addition, check that the wiring harness connection between the RDCM and e-motor is properly installed.
If the latest calibrations are installed and the wiring harness connection is in good condition, the Rear Axle Differential Lock Control Actuator should be replaced. (Fig. 8) Refer to Rear Axle Differential Lock Control Actuator Replacement in the appropriate Service Information.
Fig. 8
For more details, including parts information, refer to Bulletin #23-NA-104.
– Thanks to Frank Jakubiec
