Chevrolet Forum - Chevy Enthusiasts Forums - 4L80E truck going into limp mode, help please

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- - 4L80E truck going into limp mode, help please (https://chevroletforum.com/forum/silverado-fullsize-pick-ups-21/4l80e-truck-going-into-limp-mode-help-please-49611/)

Quote:

Originally Posted by sholaway1 (Post 268118)

I know this is a very old thread but My truck had intermittent sometimes I could turn ignition on and off and it would work. Now it is steady. I have no gear selection indicator, no Speedo, no tach my trans has no 1st gear and no high gear only end and third and only second if I shift manually to first or second. Any ideas .... I have unplugged trans to see if it would manually shift thru gears but nothing. I have checked the plugs for corrosion on my neutral safety/shift position sensor on drivers side of trans. I have been told it's a corrupt ecm I'm not convinced.... Any test I can run say at steering column to see if ignition switch is even sending a signal to pcm? Hopefully I can get a quick reply e-mail would be awesome sholaway68@gmail.com

I have codes p1180 and 1184

I am also having the same exact problem with my instrument panel and transmission. Identical issues. Please help.

I pulled that code yesterday, P0756, solenoid B. I removed the pan and filter, and as I look at the valve body, I see 3 solenoids. Which one is "B"? Any help would be appreciated.

Kind of crazy but im seeing the same problem in my 03 Chevrolet 1500HD. Instrument panel is dead but intermittanly turns on. My transmission will sometimes work correctly but mostly be stuck in 2nd gear or reverse (limp mode). I can turn the truck off and wait a few seconds and it will help sometimes. Has any one figured out this problem?

Thanks!