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Old 06-11-2020, 11:10 PM   #1
Join Date: May 2016
Posts: 36
Grounded wire and “Do Not Shift” light won’t go into gear

I recently purchased a 93 coachman mountain aire diesel pusher. I’ll be driving it takes a really long time for it to shift from 6-2 to 6-3, and then shifts really quick into 6-4. Also, out of nowhere it jerks really bad, the “do not shift “ light comes on and it starts beeping. Most of the time I can pull over turn off the engine and it resets and everything is fine. Unfortunately, this is not the case at the present moment. I’ve got stuck for a couple days last week because it wouldn’t go into gear at all. We thought we fixed it but a couple days later I went to start up and again the light won’t go off and I can’t drive away. I contacted an Allison repair shop and the fellow was kind enough to help me go through the steps to retrieve the error codes from the keypad via FaceTime. He looked them up and said there’s a wire that’s ground on the transmission and the other is the throttle sensor needs to be adjusted. A gentleman helped me trace wires underneath as well as from the shifter box.( I’m a disabled female traveling alone) We found a couple wires that were loose or disconnected and fixed them, which at that moment looked as if it fixed that problem because I was able to drive away. Unfortunately the celebration was short lived because I am stuck once again, with the transmission refusing to shift into D and I have no clue what to do now. I’m mechanical, love the smell of oil, but this is my first diesel pusher and I am completely ignorant and terrified of electrical work. I’m broke and traveling alone and tomorrow is street sweeper day. So I need a quick, cheap fix if possible. Repair shops aren’t an option because of my financial situation so I’d be forever grateful for any help you can give me. Thank you and god bless!

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Old 06-22-2020, 07:10 AM   #2
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Join Date: Sep 2016
Location: Sarasota, FL
Posts: 3,975
Do you mean Newmar Mountain Aire?
I've attached a 3060 manual (3 parts) that has troubleshooting in it.
Hope it helps you figure it out.

Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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Old 06-23-2020, 03:56 PM   #3
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Join Date: Aug 2007
Posts: 181
Allison transmission troubles...I've been there and as far as I know, there is no quick fix
Are you getting the so called "snake eyes" on the Allison display? I spent a couple months trouble shooting my Trans in the driveway ultimately getting the electronics rebuilt at Transmission Specialist in Texas. Browse through my posts on this forum for the phone number of John( at transmission specialist)......he's very helpful.
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Old 06-24-2020, 11:32 AM   #4
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Location: Sarasota, FL
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Yup John is very helpful. https://www.transmissioninstruments.com/
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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