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Looking at buying one tomorrow but its two hours away and it's an older lady that I don't think will crawl under the truck for an up-close picture of the transmission. I cant seem to find a trustworthy google article that explains this. I am hoping it has the 4l80e like some videos say. Others...

Seems like if I add coolant to the reservoir next to the air intake I will lose some somewhere near that drain plug. Is there an overflow drain that will allow it to just freely drip out? I noticed this threaded hole above the plug and I'm not sure what it's for. I don't think I am losing fluid...

Converter locks up it's a new reman haven't had any issues with it since putting it in. Did infact go scan it and got p1122 code. TP intermittent low voltage. That's a new TPS so I just pulled it out and while in there took the throttle body off. Throttle body was caked in carbon causing the...

350 5.7 Vortec engine, RPM about 3k at 75mph hit a hill on the interstate and will drop to maybe 2500 RPM if that. Sometimes won't even drop it'll just slow down to about 60. Haven't checked for codes in a while but last time I checked there was nothing. Brand new PCM in March, checked in April...

Also random side note, every single time I start my truck the gas pedal is stuck. You have to actually kind of give it a quick stomp to get it going. Once moving it doesn't happen again. Turn it off and turn it right back on the gas pedal is stuck again. Any correlation? Anyone delt with this...

Is there a second filter on the rail somewhere? Engine has 150k miles. Seems strong on flat ground. Transmission has been great since replacing.

Quick background I've have the truck since November 2022. Have always noticed it sort of struggled uphills. Infact my 5.7 c1500 seems to tow better for this reason. It's just not quick off the line in any sense and struggles uphill especially towing. Recently bought a dump trailer this week and...

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