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So far I haven't been able to diagnose the issue. The transmission light arrived, but under the truck there is not a plug in for it. Chased every wire. Odd. And now the truck is running fine cold and at temp. Any ideas? I drive it every day and don't want to be side lined with an issue.

Odd. Truck is running fine now. Granted, it's cold in the NW, but I haven't done anything other than not turn on the step down.

I will check this out. My goal is to dive into it this weekend. The truck sat for about 5 years. Had to replace the motor, but I figured there would be other things that would pop up. Hands down the most fun vehicle I've ever had.

Also, when the truck is cold everything works great. At about 160 degrees or operation temp it goes into limp mode.

Thank you. Transmission was serviced in April of this year. Fluid is full. The light was removed either when the transmission was removed or by someone else. I just received the replacement light from eastern surplus. Any idea where it plugs in on the transmission? The pigtail is about 8...

Thank you. Is there a difference between the two wires between the TCM and the regulator? I'm at work and can't take a look at it. Side note, I had a shop install a 12v stepdown, 12v circuit board and a relay so I could charge phones etc. The day before I took it in, I was driving and it...

Thank you. I'll check it out.

Hello, This is my first post. I have an 04 M1123 with a 6.5 NA engine and a 4L80E transmission. It was running great but is now stuck in limp mode and when I put it in reverse it stalls the engine. I am thinking it is a control issue with the computer. If anyone has dealt with this and has a...