When backing up get jerku motion, feals like brakes locking up.
Still under warranty, take it back to the dealer…
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I have experienced that many times: Auto Emergency Braking. If there is a pedestrian walking or a vehicle in motion that is 20 feet away, the safety system locks the brakes.
Try switching off the auto emergency braking or the cross-traffic alert.
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Another possibility is…
When I go to back out of my garage most of the time, it will do something strange like a nanosecond hit the brakes after I have moved about the wheel base of the truck, but it only does it once, maybe only once a day, anyway it seems to just be the ABS module running a test or something… Nothing is ever behind me when it happens and the driveway is up hill, curved and over 20 feet long…
OP, you gave a very vague description of what happened, does it do this every time you back up, does it do it multiple times while backing up??
If in doubt, again, it is still under warranty unless you really drive a lot… lol