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Holden Astra 2005: Why is it losing drive when upshifting?

Intermittently when upshifting, my 2005 AH Holden Astra automatic will hang on in second for a few seconds and then loose drive. If I flick the shift into neutral then back into drive it re-engages drive again. I can also be driving along at 80 km/h per hour in top gear and it will also just loose gears, like it goes into neutral. I have had the transmission changed twice under warranty, but this has not solved the problem. It has been back to Holden and they say they can't find anything wrong. Any help would be great as this is very frustrating.

That's a tough one, but you would have to think it's external to the transmission given it's twice been replaced. It could be a number of problems, from a speed sensor, the gear position switch or the ECU. The best thing is to get it to an auto transmission specialist and have it checked.

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