2005 Silv 2500HD DTC P0894 Trans Component Slipping

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Posted by Louie65 ( on 16:14:57 02/25/15

Pickup has the 4L80-E transmission. Engine check light turned on after driving on highway over 70mph. After exiting the highway, the trans will start shifting very harsh especially 1-2 shift. After cool down, light remains on and no problem city driving. The highway driving triggers the harsh shifting. Trans was serviced 10k miles ago and is at proper level and not burnt. Has anyone experienced this issue before? If so, what was the fix for it. Vehicle has 128k miles and i am fearing that it will need a rebuild.

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