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      11-09-2020, 06:22 PM   #2
ttimbo
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Drives: F48 X1 25i AW; F20 M135i AW
Join Date: Jan 2013
Location: Australia

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I suspect the transmission might have become quite warm during the drive you described. If it had actually overheated, I'm sure there'd be a warning light.

To answer the question, yes it is possible but improbable to over-rev using engine braking on a t/q automatic transmission. The transmission ECU usually has various protections in place that should prevent over-revving in most circumstances. That said, if the descent conditions mean you need to use M1/M2 constantly, I'm thinking you perhaps should have used either the brakes more (shouldn't overheat too much at those low speeds) or perhaps engaged hill descent control. Both should enable mechanically sympathetic control of the vehicle
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