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Marck
New Member

8 Posts

Posted - 04/30/2013 :  7:07:01 PM  Show Profile  Visit Marck's Homepage  Reply with Quote
We have a 2009 International school bus. Recently our driver tried to do a restart and the "range inhibited" light came on the left side dash cluster and he could get no response from the trany. The shift lever would go into gear but no action from the trans what so ever.
Fluid level OK although probably needs to be changed soon.
Any ideas ???

Thx, Marc

Fastback
Top Member

971 Posts

Posted - 05/01/2013 :  04:17:53 AM  Show Profile  Reply with Quote
Was drivers foot on the brake pedal when shifting into gear? Do brake lights come on when brakes are applied? If all else fails, try momentarily disconnecting the battery cables and see if problem goes away.

Why yes, the ORIGinal CHARGER is a Fastback
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Marck
New Member

8 Posts

Posted - 05/01/2013 :  05:29:59 AM  Show Profile  Visit Marck's Homepage  Reply with Quote
Hi, Thx for the reply. I don't believe this is a bus with the "service brake" on requirement.(we have others that do that). These are regular drivers that report this issue on one particular bus all of a sudden. First they get the "range inhibited" message and don't seem to notice the trans problem till they get stopped and try to go again ?(I'm still doing some fact finding)

Marc
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IBTMech
Top Member

USA
973 Posts

Posted - 05/01/2013 :  6:13:56 PM  Show Profile  Visit IBTMech's Homepage  Reply with Quote
Step one is to search for power supply issues including the ground side.

If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years.
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Marck
New Member

8 Posts

Posted - 05/02/2013 :  05:28:20 AM  Show Profile  Visit Marck's Homepage  Reply with Quote
Thx for the info about the NSBU. Which connectors are you talking about?


Thx again, Marc
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Wolf0r
Top Member

USA
2179 Posts

Posted - 05/02/2013 :  08:59:13 AM  Show Profile  Reply with Quote
quote:
Originally posted by Marck

Thx for the info about the NSBU. Which connectors are you talking about?


Thx again, Marc



If you have a 2009 I doubt you have a NSBU bolted to the outside of the transmission. You should have a 2000 series Gen4. Most range inhibits will set a code. The last one I had doing that on a 2008 it turned out to be the output speed sensor. If you know someone with Allison DOC software it makes diagnosis a lot easier. It the TCM sees movement in the speed sensor (rolling backwards or forward), or if your foot is on the accelerator while shifting will cause range inhibit.

“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson
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