Hunter013 Posted April 17, 2023 Share Posted April 17, 2023 (edited) Mack GU813 S/N: 1M2AX16C9JM039991. When you're in 12th gear, roughly 1400 rpm and up, the transmission acts like it is trying to shift up another gear, when there isn't anymore gears to go. And when it does that, the rpm dial goes up higher in rpm, rather than lower, like how it would shift normally between gears. All other gears work fine. One code popped up as I was driving. P107492: Gears 2 and 3 engagement system - incorrect performance or operation. Edited April 18, 2023 by Hunter013 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 19, 2023 Share Posted April 19, 2023 Yours falls into a service bulletin. Looks like probably the ribbon harness inside the transmission. I’ll try to find the bulletin and attach Quote Link to comment Share on other sites More sharing options...
Mackpro Posted April 19, 2023 Share Posted April 19, 2023 Here is the bulletin Mdrive F GU series.pdf 1 Quote Link to comment Share on other sites More sharing options...
QUEST2015 Posted November 8, 2023 Share Posted November 8, 2023 Good evening, I’m having this same issue as we speak, any info on how to repair or a part number for the ribbon harness? Quote Link to comment Share on other sites More sharing options...
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