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Why does my 2017 Holden Astra jerk when I put it in reverse?

Asked by Kun

I have two questions about the transmission of 2017 Holden Astra:
 
 1. The car jerks hard when shifting to reverse, happens sometimes.
 
 2. High revs (3500rpm) gliding down a slope, happens very occasionally.
 
 I had the car checked by the Holden dealer, they said they couldn't find anything wrong with it. Do you know what it could be?

Answered by CarsGuide

4 Nov 2020 David Morley

The jerk when you select reverse sometimes is definitely worth having diagnosed properly as it shouldn’t be that way. Scanning the car (which I’ll presume the dealership did to arrive at its answer) doesn’t always show up all faults, so just because the computer says there’s nothing wrong, doesn’t mean there isn’t. There are plenty of reasons for a car to jerk into a particular gear, but the good news is that the Astra uses a conventional, torque-converter automatic, not one of the vastly more troublesome double-clutch units.

Your second problem, however, may not be a problem at all. In fact, the gearbox in the Astra is smart enough to know that you’re coasting down a hill and will actually shift down a gear or two to take the strain off the brakes while still maintaining your speed. As it shifts down gears, the engine revs will rise; that’s absolutely normal and part of the way the car is designed to operate.

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