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Well Doug I didnt see this comment in time, dealer mentioned something about a recall I believe. But yeah after diagnoses they told me the entire ECM was bad and they went ahead and ordered a brand new one from GM down in Arkansas. Will have it here Friday and they are gunna put it in Monday...

Shop looked over everything ended up getting communication with ABS but nothing from the transmission or engine. He ended up telling me to take it to the dealer to have them reflash the ECM. He's never seen it where it will communicate with the ABS but not the ECM. Will know Tuesday if the...

Yeah it does have the 4l80e someone just threw that out to me and I never heard of it. Next Wednesday I can put this post to rest, Ill update then for anyone curious.

TV cable? Not much on youtube but that could be a reason why the truck is shifting a bit late right? Im thinking it's just a guessing game to fine tune it. Also as of like 3 days ago every time I start the truck the pedal feels stuck. Only when I start it. Any correlation to any of my other issues?

Did this today and experienced exactly what you described. I didn't feel any issues with the lock up today either. Have an appointment next Wednesday to try and get communication back, have a weird feeling it's the ignition switch. Going to see if I can find ways to test it.

Yeah I read about that, definitely staying away from jiffy lube. I will just get a drain and fill with a new filter. Transmission shop near me would have this whole thing done by now if it weren't for communication issues. Found a local shop with 25+ years in business that deals with electrical...

Bought the truck November of 2022, only put about 4k miles on it but I have not done any transmission service yet. I might have to try draining and having the filter changed. I have changed the MAF, coolant temp sensor and just yesterday did the tps. Coolant temp sensor completely got rid of my...

Level is spot on, color is nice and red with no debris. Alot of the transmission problems I'm thinking are just sensor related. If I can't figure out communication I wont know which to replace and would probably just throw money at it until its fixed. Still 90% sure I'm dealing with torque...

Yeah it's got an aftermarket radio in it that's it. Radio has never given me issues that I can remember, but today on my way home I realized half of my cluster lights don't work. I remember replacing them to an LED blue when I got the truck and that half has never worked. Wondering if there's...

Last question towards pavaltolz, how would I specifically check the connectivity between port 2 and ecm?

Also pulled all sensors under the hood and all had power. Did not get to back probing today. MAP had a lot dimmer light but I'm guessing maybe it's like the tps and needs to be under load to get to 5V?

There's a lot to digest here. Thanks for all the replies, its definitely getting me closer to figuring this all out. Today re-grounded everything and started the truck up and had a check engine light on that wasn't on before. Tried to use scanner but still no communication, check engine light...

Shop used a snap on one not sure exactly. I went and rented one from autozone last night same message comes up

I'm fairly positive pins are good I had them all out today. Port has power as well. I suppose I can dig deeper on grounds, I only replaced 3 today. As for carrier bearing, I had that replaced the same time as the U-joints. Should add that transmission fluid is clean and has the correct amount...

1997 c3500 5.7 - about 6 months ago a vibration would start between 50-55mph, immediately replaced u joints and had driveshaft balanced. After the vibration was still there at 50-55mph I also noticed it around 70mph. Lead me to believe it was the torque converter. Well two days ago lost...