will pay 50$ for good advice
Apr 28, 2015 | 04:51 PM
#11
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TECH Enthusiast
Joined: Apr 2013
Posts: 551
Likes: 1
From: eastern nc
problem maybe resolved
tranny is 4l80 but running 4l60 segment which in 4l60 supplies 12v to tcc switch .4l80e tcc doesnot work on 12volts .so I am unlocking converter and leaving unlock
Last edited by tim wellington; Apr 30, 2015 at 06:56 AM.
May 13, 2015 | 10:19 AM
#13
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TECH Enthusiast
Joined: Apr 2013
Posts: 551
Likes: 1
From: eastern nc
cam and code 121
found the problem cant believe no else had problem before (or just didnt tell)the problem is factory setting at idle are 65 kpa (for ls1 and truck pcm) .but will large duration cam .you might go over to 75 to 80 kpa at idle .if present for 20 to 25 second and S.E.S CODE 121 CAUSING what bill at hp tuners call phantom code symptoms are ..shift from 1st to 4th by 40mph no down shifts and tcs switch not unlocking converter . I HOPES THIS HELP SOME ELSE 
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