Originally Posted by jhs3eva
I love all of the transmission "experts" who spout off about "the underlying problem" and band aids in that high and mighty "what a bunch of dumb amateurs" tone. I brought my 4T65E to several "experts." Each was more than happy to charge me for a full diagnostic. Not a single one was able to tell me what was wrong. Every single one told me that that I needed a rebuilt transmission installed, but not a single one could tell me why. Not a single one rebuilds these transmissions anymore because they are basically grenades and apparently none of them could tell what made the pin stay in or fall out (metaphorically speaking, of course). I am not kidding. They all order rebuilds with warranties because it's apparently the only way not to lose money on these dumb things. When they grenade again someone else is on the hook.
GM put out an early TSB on the P1811 and EPCS and later withdrew it. There is nothing in its place now because apparently even GM can't tell you all of the different kinds of things and interacting things that go wrong with these transmissions and/or with their control systems - because the problems with electronically controlled transmissions, as we know, is not always IN the transmission (or the converter).
And the P1811 is a long shift code. Max line pressure is the fail-safe put in place when the long shifts are detected so that the long shifts don't continue to burn up the clutches. What causes the extended shift times? Apparently any number of things that no one is ever able to figure out. What "cures" it? Well let's see...the $100 "band-aid" fix or the $4,000 "band-aid" temporary rebuild non-fix from the "experts." I think anyone doing battle with one of these disastrous transmissions is capable of doing the math and then making that decision themselves. There is no need to hang around talking the "right" way. The "right" way is the one that works, and I have yet to find any transmission "expert" who knows what that is on the 4T65E.
