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Old 07-01-2015, 09:23 AM   #1
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Tranny sometimes "slips" into neutral on takeoff

Our 2004 Country Coach has an erratic transmission issue. Occasionally it will act like the transmission slips into neutral when coming off a stop and making a low-speed turn. When this happens the "6" flashes. Sometimes I have been successful in quickly pushing "n" and then back to "D" and things re-engage...at least for while. A code "3500" was registered, which indicates a power interruption issue. The ground has been checked good by an Allison service center, and the contacts all cleaned.

Is there anything else that could be causing such behavior? We will be leaving for a 2-month trip and obviously need to have the problem resolved.

Thanks for any thoughts.
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Old 07-01-2015, 09:51 AM   #2
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Erratic electrical issues were the biggest headache , I had when, I was still working.
Did the shop give any indication where they thought the interruption might be ?
Battery side of the control module's power supply?
Communication between the key pad and the controller ?
There have been posts on a poor splice in the wiring to the trans control module, in the battery power feed, but I think that was a chassis manufacturer, and year, specific issue.
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Old 07-01-2015, 04:20 PM   #3
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Had basically the same problem. I found a pin in the wiring harness had come unseated in the connector. Check both sides of the connector that connects the shift pad to the coach harness. There is approximately a one foot pig tail on the shifter pad. You can get to it from the access panel next to the drivers seat
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Old 07-03-2015, 02:27 PM   #4
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Quote:
Originally Posted by Skip426 View Post
Erratic electrical issues were the biggest headache , I had when, I was still working.
Did the shop give any indication where they thought the interruption might be ?
Battery side of the control module's power supply?
Communication between the key pad and the controller ?
There have been posts on a poor splice in the wiring to the trans control module, in the battery power feed, but I think that was a chassis manufacturer, and year, specific issue.
Quote:
Originally Posted by dons2346 View Post
Had basically the same problem. I found a pin in the wiring harness had come unseated in the connector. Check both sides of the connector that connects the shift pad to the coach harness. There is approximately a one foot pig tail on the shifter pad. You can get to it from the access panel next to the drivers seat
Thanks gentleman for the information. I subsequently talked with the service manager, who was not certain this check was done and needed to talk with his technician, who is off for the holiday until Monday. So we will see. For $600 you would think this obvious point of potential failure would have been checked.

In the future I will use this and other forums for help before going to the "professionals", who if nothing else gouge the heck out of MH owners with exorbitant charges for their "services".

Thanks again for the suggestions
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Old 07-10-2015, 10:07 AM   #5
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I had similar issues. Turns out it was the ECU, I had a few service places quote the part, ranged from 500 to 1200. I went with the $500 easy plug in part and it's been fine ever since.
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Old 07-11-2015, 09:40 AM   #6
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Originally Posted by bobioknight View Post
I had similar issues. Turns out it was the ECU, I had a few service places quote the part, ranged from 500 to 1200. I went with the $500 easy plug in part and it's been fine ever since.
I have been assured it is not the wiring nor connections, so if it happens again I'm afraid as in your case it has to be the ECU. I wonder if one can find a wrecked MH and get the part that way?
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