T42 / 4L80E limp mode - how to troublshoot?
#1
T42 / 4L80E limp mode - how to troublshoot?
My swap project has a L92 6.2 mated to a 4L80 both of which are managed by an E38 and T42 transmission controller. I took the car out for the first time and noticed that the transmission starts out in 2nd gear and will not shift as it should. I verified constant and switched 12VDC plus the ground is correct. Anyone have other ideas for troubleshooting this? My tuner knows what he is doing and supposedly flashed the T42 with an express van tune. I made the harness and closely followed the express van schematic. Any thoughts or ideas would be greatly appreciated!
#3
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I'm guilty. I'm 1 of the 145 views.
I click on anything with a 4l80e in the title as I just installed one in my Nova.
Be patient. One of the trans pro's will try and help.
Don't forget, they do this for a living and aren't sitting by the computer waiting to answer our questions.
We'are lucky they help.
I can kind of relate when I'm in the big box stores (not by choice) looking to pick something up in a pinch and I see some guy in the electrical isle with the wrong material to do a job.
I see the deer in the head lights look and I ask them what they are "trying" to do
and either tell them the correct way OR to hire a licensed electrical contractor (not necessarily ME) to do it!
I click on anything with a 4l80e in the title as I just installed one in my Nova.
Be patient. One of the trans pro's will try and help.
Don't forget, they do this for a living and aren't sitting by the computer waiting to answer our questions.
We'are lucky they help.
I can kind of relate when I'm in the big box stores (not by choice) looking to pick something up in a pinch and I see some guy in the electrical isle with the wrong material to do a job.
I see the deer in the head lights look and I ask them what they are "trying" to do
and either tell them the correct way OR to hire a licensed electrical contractor (not necessarily ME) to do it!
#5
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#8
did he flash first or read the computer first? youre supposed to hook up the tcm with the 80e segment on it already, and then read the file. This will result in a file that has the engine parameters mated to the 80e segment.
#10
I tells me my base tune is from an Escalade which doesn't make sense to me provided the Escalade had a 6 speed. You would think that starting with an Express Van 6 liter with 4L80E would make more sense.
Thanks for your input