CTown Duramax
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- Joined
- Oct 14, 2021
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Strange Auto Stop Start Engagement
This is a 100% repeatable thing. 2021 Tahoe LT diesel base 4WD. (This is a wonderful SUV. No criticism here. Just getting used to the features. I have never liked a car as much as this one.) Has anyone else seen this and what do you suggest?
Start without disengaging auto start-stop. Back up out of garage turning up hill and stop with front facing down hill and and rear going up hill. Foot on brake. Shift to park. Engage parking brake. Foot off brake. Then remember to disengage auto stop-start.
The car lurches forward one or two inches onto the transmission park pin or maybe the parking brake reengages - that's how I would describe it, a small lurch forward onto another stop. Foot on brake. Engage drive. A sort of snapping noise as the car goes into drive. Release brake. So I do not know what the sound is, whether it is the parking brake letting go or the transmission coming out of park.
To have the car move on the parking brake is alarming. The noise is not gunshot loud, but one of those noises a machine shouldn't make.
Maybe there is some interaction among auto start stop, hill assist and the parking brake.
The grade is somewhat steep. I estimate 20%.
I forget the auto start stop half the time. Maybe I will get that module. I was hoping to avoid messing with a brand new car.
MY SOLUTION FOR NOW is not to turn off auto start stop when on a hill. The auto stop does not operate in this situation - i.e., the engine keeps running.
This is a 100% repeatable thing. 2021 Tahoe LT diesel base 4WD. (This is a wonderful SUV. No criticism here. Just getting used to the features. I have never liked a car as much as this one.) Has anyone else seen this and what do you suggest?
Start without disengaging auto start-stop. Back up out of garage turning up hill and stop with front facing down hill and and rear going up hill. Foot on brake. Shift to park. Engage parking brake. Foot off brake. Then remember to disengage auto stop-start.
The car lurches forward one or two inches onto the transmission park pin or maybe the parking brake reengages - that's how I would describe it, a small lurch forward onto another stop. Foot on brake. Engage drive. A sort of snapping noise as the car goes into drive. Release brake. So I do not know what the sound is, whether it is the parking brake letting go or the transmission coming out of park.
To have the car move on the parking brake is alarming. The noise is not gunshot loud, but one of those noises a machine shouldn't make.
Maybe there is some interaction among auto start stop, hill assist and the parking brake.
The grade is somewhat steep. I estimate 20%.
I forget the auto start stop half the time. Maybe I will get that module. I was hoping to avoid messing with a brand new car.
MY SOLUTION FOR NOW is not to turn off auto start stop when on a hill. The auto stop does not operate in this situation - i.e., the engine keeps running.
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