4L80E needs some help!
Lol you are right about the transmission shop. They weren't very helpful.
I ordered this http://www.electricaladvantage.net/4...alharness.aspx since I'm getting a tcc code, manifold pressure switch code, suspected problems with solenoid A, and it's leaking at the main connector. Hopefully this does the trick.
I ordered this http://www.electricaladvantage.net/4...alharness.aspx since I'm getting a tcc code, manifold pressure switch code, suspected problems with solenoid A, and it's leaking at the main connector. Hopefully this does the trick.
Lol you are right about the transmission shop. They weren't very helpful.
I ordered this http://www.electricaladvantage.net/4...alharness.aspx since I'm getting a tcc code, manifold pressure switch code, suspected problems with solenoid A, and it's leaking at the main connector. Hopefully this does the trick.
I ordered this http://www.electricaladvantage.net/4...alharness.aspx since I'm getting a tcc code, manifold pressure switch code, suspected problems with solenoid A, and it's leaking at the main connector. Hopefully this does the trick.
And yes, reverse will still work with or without the A solenoid on (GM designed it this way). I also have a fairly good knowledge of 4L80 hydraulics.
Ok I got all the switches and solenoids changed as well as a new internal harness. The truck drives MUCH better now. I have first gear no problem. But now I have unveiled some new problems. The 1-2 shift is very sluggish and very hard when it does shift. It seems delayed. It kinda pauses for a sec in the middle of a shift. But, it shifts like it has a shift kit in it. And the longer the pause in the 1-2 shift the harder it shifts. Also, still no 4th gear or tcc lockup. Im gonna clear and check DTCs tomorrow and go from there. Right now Im thinking external wiring issue.
Showed my wiring guy this... http://performancetrucks.net/forums/...d.php?t=413157 and he says he put pin T in location U instead of S into location U. Should explain the problem. We are going to fix it friday night.
Still unsure about the 1-2 shift issue. Probably need the second vss plugged in. Any idea where I can get another vss plug and pigtail?
Still unsure about the 1-2 shift issue. Probably need the second vss plugged in. Any idea where I can get another vss plug and pigtail?
Last edited by flattopwill; Apr 22, 2010 at 04:20 AM.
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Verdad Gallardo Showed my wiring guy this... http://performancetrucks.net/forums/...d.php?t=413157 and he says he put pin T in location U instead of S into location U. Should explain the problem. We are going to fix it friday night.
Still unsure about the 1-2 shift issue. Probably need the second vss plugged in. Any idea where I can get another vss plug and pigtail?
Still unsure about the 1-2 shift issue. Probably need the second vss plugged in. Any idea where I can get another vss plug and pigtail?
Fixed the transmission wiring tonight. Had a misplaced pin. Fixed it. I have TCC lockup now. Check engine light came back on tho.
Still have the weird 1-2 shift issue. Guess ill hunt down another vss connector.
Still have the weird 1-2 shift issue. Guess ill hunt down another vss connector.
yes, the ISS harness is the same as the VSS harness (just different pins on the PCM).
So the code turned out to be for the pressure manifold switch. It has a brand new one so I dont know what could cause it. Could it have something to do with the missing vss?
95% of the time the truck drives great. The other 5% is the 1-2 shift issue and also a weird thing that has happened twice - It will fall out of 4th gear into 3rd but still give me converter lockup. Didnt know this was possible? Its very weird. Both times this happened it was on the same road with the same driving conditions - cruising at ~60mph with the converter locked and then after about 4 miles it just falls out of 4th and into 3rd. Any ideas?
95% of the time the truck drives great. The other 5% is the 1-2 shift issue and also a weird thing that has happened twice - It will fall out of 4th gear into 3rd but still give me converter lockup. Didnt know this was possible? Its very weird. Both times this happened it was on the same road with the same driving conditions - cruising at ~60mph with the converter locked and then after about 4 miles it just falls out of 4th and into 3rd. Any ideas?
