The Adaptive Cruise Control or regular Cruise Control as well as the Lane Keep Assist system may turn on/off while driving or may be inoperative on some 2019-2023 Encore GX and Trailblazer models. (Fig. 8)
The Lane Keep Assist or vehicle detection symbols may constantly turn on and off while driving, or a Lane Keep Assist Unavailable message may display on the instrument cluster when turning on the system. No DTCs will be set in any control modules. The Engine Control Module data for Cruise Control inhibit history may show “Distant Sensing Cruise Control Communication Malfunction.”
If these conditions are found, verify that there are not any obvious signs of any wheel speed concerns, erroneous ABS activations or DTCs. Any of these issues should be addressed.
Fig. 8
In addition, check the size of each tire and verify it is correct for the vehicle application. All tire sizes should the same and correct for the vehicle application based on the tire placard location inside the driver’s door pillar. If GDS 2 is used to monitor wheel speeds, it may be noticed that one wheel speed is 2-3 mph consistently faster than the other wheels, indicating that the tire may be an incorrect size.
Refer to #PIT6196 for additional information.
Thanks to Jeff Knight
