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dsalinas1939
Top Member

USA
1111 Posts

Posted - 06/25/2021 :  08:20:33 AM  Show Profile  Reply with Quote
i have this c2 with 6.7 1000/2000 series allison trans i got a code 614 with check trans light on i went thru the tree and it said that i have problem with the LRTP torque reduction it shows ass incorrect on allison doc and its sayin its a ecm software issue now i no these things have an issue with the tcm so just for hell of it i tapped on the tcm and the trans light went out i drove it for a bit everything was good so i am thinking tcm is bad so i parked it couple days later i jump in same issue trans light on code 614 and now the range light is on and it wont let me shift this time i tapped on it the range light went out but code 614 and check trans light still on so am not sure if i have a tcm or ecm problem any ideas

TRex
Senior Member

60 Posts

Posted - 06/29/2021 :  3:26:01 PM  Show Profile  Visit TRex's Homepage  Reply with Quote
Swap TCM's if you can. That is likely a GEN 5. Allison is having a lot of trouble with those. We have replaced/sold 4 or 5 in last 6 months. The two Allison places we deal with usually have 5 or 6 new ones in stock. That is a clue there are problems. Cummins ECM is way more reliable than the Allison TCM
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dsalinas1939
Top Member

USA
1111 Posts

Posted - 07/01/2021 :  06:08:12 AM  Show Profile  Reply with Quote
yeah i thought to swap with sister bus but all my buses are leased to summer camps except this one so i called allison for a tcm they toldme they are six weeks out and even that is a maybe uggggggg
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dsalinas1939
Top Member

USA
1111 Posts

Posted - 07/07/2021 :  10:24:04 AM  Show Profile  Reply with Quote
i got the new tcm friday put it in bus been on road few days no problems
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