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Old 08-24-2012, 11:50 AM   #1
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Fault code says range inhibit

Have a 2006 Dutch star cummins engine 400 isl. with a Allison 6speed transmission. I just drove off for vacation and everything was running fine I stopped for a light and when I drove a warning buzzer came on that said. Range inhibit. Check engine. I noticed that the transmission stayed in first gear. All gauges read normal. And there were no leaking fluids. I tried it again and the same thing happened. I checked the fault code and it said. " 3 transmission. Spn 2003 fmi 15. Any ideas before I take it in and pay some big bucks?
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Old 08-24-2012, 07:02 PM   #2
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Try finding your TCM (transmission control module) and re-seating all the connections. On my coach I believe mine is in the bay under the drivers side window. Don't know about your coach.
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Old 08-25-2012, 07:13 AM   #3
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Had something similar happen to mine. We're on a Freightliner chassis so after some quick diagnostic work I was able to do, I called them with the fault codes I was getting. Turned out to be a speed sensor issue. I asked for and received the location of the speed sensors, and thanked the Freightliner tech for his time. Crawled under the coach, and the problem was seen immediately. One of the speed sensor wires had managed to work itself loose somehow and had become partially unplugged. Plugged it back in, and we were back on the road! Cost = zero!

My point? Call Freightliner (or whoever your chassis manf. is) and run the trouble codes past them. See what they say?

Best of luck, -Al
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Old 08-25-2012, 12:22 PM   #4
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Range inhibit usually means the tranny thinks the engine RPMs are too high (or low) to safely shift, so itlimits what can be done. That often means the sensor has gone bad or a wire come loose, as in Al's example.
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Old 08-26-2012, 10:33 PM   #5
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Range inhibit follow up

Thanks for the advice. I was able to drive it a few minutes longer and it shifted out of the problem. I have since driven about 250 miles with no problems. It only happens when I am driving slow speeds through town. I will keep an eye on it.
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Old 08-27-2012, 07:24 AM   #6
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Just an FYI, that's pretty much how ours acted. It gave me a little trouble as we were leaving a park, not wanting to shift out of first. When I pulled over out of the way, it wouldn't even go to neutral until I shut the engine off, then restarted it to reset everything. At that point it was fine. I was pretty proud of myself for thinking to do that. We drove it 300 miles that day, moving to our next stop, acting completely normal, not missing a beat or giving any signs of impending doom. Leaving that next park though, way out in the middle of nowhere, it did the same thing as we were leaving - only this time it would not reset.....

Keep that trouble code handy. You may want to have it for reference in case you experience the same thing? If it throws that same code again, safe bet when you track it down you'll have your issue nailed?

Nothing like the frustration of tracking down an erratic problem....
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