Code P0776????HELP

Builtlngbd

New member
Aug 24, 2009
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Driving down the highway and tranny shifted from six to fifth and wont shift out of fifth. The truck through a P0776 code. Already cleared the codes a couple of times, but keeps acting the same. What would cause this and how could i fix it.
 

Builtlngbd

New member
Aug 24, 2009
392
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oka so i did more testing and found this....goin down the hight way at about 65mph i will put the tranny in M and put it in 4th gear hammer down on it shift to 5th and it hangs up in 5th. and just stays in 5th i have to come to a complete stop and clear all the codes once or 2twice then shes good to go. Also when its doing all this for a little while it seems to loose the throttle when i let off in the top of 5th and i have to wait till the rpms drop and the speed slows down before i regain the throttle. Iam goint to replace thr a&b trim solienoids and see if that fixes the flare from 2-3 5-6 shifts and hope it fixes everything else. Let me know what yall think guys Thanks
 

Builtlngbd

New member
Aug 24, 2009
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relentless diesels installed the kit. he said he looked over all the hard parts and what not and said everything checked out real good and looked good.
 

paint94979

Beer Nazi
Sep 18, 2006
11,715
8
38
37
Need to put a Tech 2 on it and moniter speed sensors. Who installed the kit? Could be a cut piston or leaky C1 ballance piston.

That is why you and only you touch my transmission Mike never a single problem in 3 years :D
 

ripmf666

Active member
Sep 20, 2006
15,123
14
38
47
Wentzville Mo
Did they even do the relearn with a tech2 if not I almost bet the few clutch packs are toasted already. You can ask I learned the hard way efi live will not do it and just driving and letting it learn without the relearn with the tech2 does not cut it I killed the c2's c3's and c4's this way made it worse by doing what your doing trying to figure it out onyour own when I should of just called the build in the first place or waited til he called back. :hug: