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The following forum entry was submitted to an issue posted several years ago. I am repeating it here, since we have not been able to find a solution here or via our dealership. We have a 2013 Hybrid SE. Hill Start Assist on our 2013 vehicle has recently started acting up. (Down Grade Assist has been an issue as well. More on that below). We live on a hillside. To exit our drive, there is a short level section as we back from the garage. As you back, you turn to aim up the driveway. Inconsistently, after you apply the brakes and shift to Drive (or Low), on accelerating the car bucks and jerks stopping for a second. This same condition will occur in traffic when stopped on a grade; but again inconsistently. (This is of major concern, since the car starts forward, then suddenly jerks to a stop and drivers behind us have nearly plowed into us.) Timing seems to be a factor. If you wait more than about 2 seconds between removing your foot from the brake pedal and pressing the accelerator, chances are higher it will occur. Subsequently an unusual sound will occur following the jerking; like the tranny is in some other gear, but that's speculation on my part. If you have any information on cause and resolution of this, please advise. The (down) grade assist feature, since early in our ownership, has had an issue as well. If activated for a down grade, then turned off nearing the bottom of the hill, one needs to pump the brakes before braking to a stop. If you don't do this, and apply the brakes to reach a full stop, the car will jerk twice as it stops; but again, this is inconsistent. These jerks are not nearly the magnitude as the Hill Assist issues, above, but are a concern. We have stopped using this feature, but would like it, if repairable. We have videod the issue. It is parked online for review. Here is the link - https://1drv.ms/v/s!Ap1n9TQWS-TDkh4e3zMAEeY3j7kt?e=xTwOeh Yes, our dealer has checked for and assures us that all applicable reprograms/TSBs have been installed.