I have a 2016 Chevrolet Suburban (Z71). How do I disable HSA? After $6,000 in transmission and brake repairs due to HSA, I would really like to turn it off.
Here is the problem:
- I stop on a hill.
- When I press the accelerator, it releases slightly while making a metallic groan, like old farm equipment that hasn't been oiled in decades. The HSA stays engaged indefinitely unless I pull over and shut off the vehicle. By "engaged," I mean flooring it to do 40mph and immediately stopping if I let off the accelerator.
This morning it engaged on a hill and, after the hill, I was flooring it to stay with traffic at 40mph. After a couple of miles, I pulled over, shut the vehicle off, and when I started again it had released.
HSA has also engaged itself while driving on the freeway several times (vehicle starts shuddering, slows way down, and starts smoking). I end up on the shoulder turning the vehicle off and back on to be able to move freely. Sometimes I have to pull over several tries before it releases completely.
I attribute an early transmission replacement and several brake jobs to this malfunctioning HSA.
What I've tried:
- I tried disabling Stabilitrak by holding down the traction control button for 10 seconds. The HSA still brakes (and breaks). (Perhaps this is because Stabilitrak only stays disabled for a short time.)
- I've searched in vain for videos, forum posts, anything about either repairing or disabling HSA.
- I tried the Jeep HSA disabling procedure (with the engine off and steering wheel straight, apply brake and e-brake, turn vehicle on, turn wheel left 180 degrees, press the traction control button 4X, turn wheel right 360 degrees, power off vehicle) but it does not seem to disable HSA on a Suburban.