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6l80 1-2 hard shift
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Question
apollo18
i got a 2007 escalade with a 6l80 (still gm ahah). the transmission was replaced about 180km ago. the truck right now has 320,000km on it.
The transmission has a problem and its had it for a while. the transmision was put in brand new around 2010/2011. The problem has been happening for atleast two years and its annoying. I hate taking it to gm because they charge a ton and then just tell me to replace the tranny.
Now to the problem:
The truck has a hard 1-2 shift, and a semi hard 2-3 shift. The 2-3 shift is ok. I only have a problem with the 1-2 shift. The truck basically thuds into a shift only for the 1-2 shift. The 3-4,4-5,5-6 are SUPER SMOOTH. its a 6l80. I had the fluid changed a couple times, that didndt fix it. I just got the whole fluid flushed with a new filter and that made the shift a little more smoother but the 1-2 is still a thud. What i noticed is that when I have the battery unplugged And then I plug the battery and drive. The transmission shifts smoothly. Last time I had to unplug the battery and drove the truck after i thought the problem was fixed but it came back after a day or two i cant remember. The 1-2 shit is hard no matter what, even with WOT, or manual or slow speed. I read around and i thought it was the TPS so i replaced that. No go, also replaced the MAF to fix a engine code, and then I read around and some people said Camshaft position sensor so i ordered that and will put it in once its here.fluid level is fine in the truck. Other then the 1-2 hard shift, the truck run's fine. i just wanna fix the hard shift. I believe its a sensor or something electrical because it seems to go away when teh truck has no battery. but then it comes back after a day or two. The 3-4,4-5,5-6 shift is ALWAYS SMOOTH. once again the 2-3 shift is bearable its a light thud but not that noticeable so im happy with it.
Truck has stock ecm and tcm. Here are some codes I pulled a couple months ago from a bully dog. Maybe they will help?
P2700 Transmission Friction Element A APPLY Time Range/Performance
P0100 Mass or Volume Air Flow Circuit (should be fine now after MAF change)
P0500 Vehicle Speed Sensor A
P0500 Vehicle Speed Sensor A
P0200 Injector Close/Open
P0700 Transmission Control System MIL REQUEST
P1500 Vehicle Speed Sensor VSS Intetermittent
and then a bunch of unknown ones too
any help?
thanks
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