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dsalinas1939
Top Member

USA
1316 Posts

Posted - 07/13/2016 :  12:09:07 PM  Show Profile  Reply with Quote
ii have a 2007 ce300 allison 2000 series trans my allison doc is not workin but i can use jpro to get codes i am getting code inactice 2723 active 734 735 and 776 i no the 734 and 735 are 4th and 5th incorrect speed and 776 is pressure solenoid stuck off not sure what the 2723 is but if i clear them they all come back the bus is stuck in second gear and sometimes it doesnt have reverse the fluid smells ok any ideas i can use allison to help diagnois

g0ttadrift
Advanced Member

USA
258 Posts

Posted - 07/13/2016 :  4:47:11 PM  Show Profile  Reply with Quote
I'm not too educated on Allison transmissions, but I'm learning as we have a fleet of 90 buses with them. The code 2723 is "Pressure Control Solenoid 1, stuck off" and code 776 is "Pressure Control Solenoid 2, stuck off". Someone might have to help out with this, but sounds to me like you could have a blockage in the valve body.
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 07/14/2016 :  05:29:09 AM  Show Profile  Reply with Quote
thanks for the info i am workin on gettin my allison doc up and running so i can get better info
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RonF
Top Member

867 Posts

Posted - 07/14/2016 :  08:31:17 AM  Show Profile  Reply with Quote
We had these same codes a few months ago. I removed the valve body and cleaned it, put it back in, no help. I replaced the valve body, as per allison doc troubleshooting, not help. I now have the rebuilt transmission sitting behind me and will install it on Monday.

US Army retired CMBT
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drp53188
Senior Member

89 Posts

Posted - 07/14/2016 :  10:15:41 AM  Show Profile  Reply with Quote
pull the pan and check for any metal in the pan, if so it needs a trans. Also the wire harness in the pan is big cause of alot of our trans problems with solenoid codes.
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 07/15/2016 :  07:07:34 AM  Show Profile  Reply with Quote
i finally got my allison doc workin i cleared codes took for a ride and it wont shift from 3rd to fouth it stops at 3rd gear then check trans light comes on and code 776 comes on i guess i will take pan down check harnes and for metal but it seems like there is no 4th gear
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 07/15/2016 :  07:45:01 AM  Show Profile  Reply with Quote
i drained the fluid it looked clean i pulled pan down omg there is so much clutch material in there its not funny i wish i new how to post pictures on here
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g0ttadrift
Advanced Member

USA
258 Posts

Posted - 07/15/2016 :  08:17:08 AM  Show Profile  Reply with Quote
Lol...hey, at least you know what your problem is now! I'd rather it be that way than find nothing and your still on the hunt.
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krmvcs
Advanced Member

362 Posts

Posted - 07/15/2016 :  08:51:14 AM  Show Profile  Reply with Quote
even though the fluid looks clean, i suggest you pressurize the cooling system just in case. ive seen the same thing happen when a cooler started leaking and just a bit of coolant mixing into the trans fluid destroyed the clutches.

-Ken-
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 07/15/2016 :  11:40:04 AM  Show Profile  Reply with Quote
yeah thats true it was throwin me cause i checked the fluid and it was very clean so iwas like no way its a bad trans now one of the guys came over and said he just did a trans service on it a week ago now it makes a little more sense they did a drain and fill
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