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Allison stuck in #1
Twice over the last month when going from N to D the tranny keypad reverts to #1 and won’t shift back to # 6. Both times when just out the garage…. last time shut off and reset back to N then to D and # 6 displayed….
any suggestions but keypad would not go back to N or access MODE…. ??
Thanks,
Go Tigers!!
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5 Replies
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I’d ask the Allison folks. The reports over the years about issues with the transmission selector seem to point to it getting wet at some point.
They are a little pricey so you want to be right before you run out and replace one that is not the problem.
FWIW I had a major issue about 20 years ago and it was related to corrosion on the contacts on the plug at the transmission. The transmission would not shift.
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Jon: Thanks as we have a Stewart Stevenson about 5 miles away and will have it checked….
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Do our transmissions have an interlock that prevents shifting when too cold? If so, could be actually cold or bad sensor. The temp sensor on my Jeep tranny went bad and trans would not shift past second.
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I don’t remember the temperature setting, but there is a “do not shift” warning if the temps are too low.
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The main code is 24 for low temperarture at -25 F at – 20 F it will allow reverse,netural and second range start operation fwiw
If your rpm’s are too high they won’t shift either and there are 10 more reasons why they won’t shift some are costly to fix
The 1st things I check for is low fluid, rpm and low voltage to the ECU and go from there
good luck
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