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Old 04-13-2014, 10:21 PM   #1
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Loss of power

Hello, I was wondering if anyone with a 5.9 cummins and allison trans has had this problem. We have a 2006 Tiffin Allegro Bay FRED and after stopping at a rest area we lost power when merging on a slight up hill grade. I pulled over to the shoulder, tried tried to merge again and this time the check engine light and trans warning lights came on and we lost power again. Pulled over to the shoulder engine still at idle, had no accelerator and the trans could not be put into any gear, stuck in park. No noise, no leaks, no wires burning, no over heating, no oil pressure drop.

Towed into a freightliner dealer, and there it sits. Dealer said he thinks it's a electrical wiring issue and needs to get time to look at it.

I don't think so, if it was I would not have been able to try to merge a second time. My guess is it's a sensor. Anyone out there had this happen ?
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Old 04-14-2014, 12:23 AM   #2
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Sorry your here with problems.
Has the dealer scanned for codes ? Or are you still waiting for someone to check the problem out ? Have you checked all the fuses ?
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Old 04-14-2014, 08:04 AM   #3
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Skip, they ran the computer test at the freightliner dealer, the person who did the test does not really know his way around with the computer, the techs who do were off sick, We are waiting for them to run the test again. We left the motorhome there, in Macon Ga, at the freightliner dealer. I don't think it could be a fuse, as I did not totally lose power and the ability to shift the trans all at once. I was able to drive the coach after the first power loss and try to merge in traffic a second time. Thanks for the reply.
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Old 04-14-2014, 09:16 AM   #4
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You would hope that anyone who could hook up the scan tool, could read codes , that would indicate a faulty sensor.
I'm scratching my head for a sensor that would set both ; check engine and trans warning;
TPS, has a redundant feature and should only set check engine, if 1/2 goes south, if the TPS fails completely you should still be able to shift. Engine RPM, sensor, is shared info between the engine and trans.
Was the tach, working properly ?
If trans controller thinks RPM is too high, it won't shift.
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