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Sorry, that's not how your comment read at all. It sounded like "Way to go wasting money buying a bunch of ECUs, because I could have just fixed it with my diagnostic cable!" And I couldn't figure out how that was possible.

Your comment is completely unwarranted. I already had 2 used ones before starting this post, and sending them to you wasn't going to do anything to fix the overspeed warning. I knew there was nothing wrong with the truck because the original controller doesn't give the overspeed warning. I was...

After trying those two used black controllers, I bought a NOS black controller and it works great. It does not have the "CTIS Overspeed" problem that the other two did.

Just for someone who might read this in the future... I changed the transmission speed sensor, and it had no effect. The original controller still works (aside from the intermittent short) and the two used black replacement units still flash "CTIS Overspeed" above 30MPH.

No need to be sorry, I'm happy it's that definitive. The overspeed issue was really strange.

Thanks. The way I'm reading that, the overspeed isn't flashing because it was changed, it's just that the new black controller behaves differently with regard to the overspeed warning (namely, if you air way down the overspeed will begin flashing continuously, and even after reaching propper...

The connections obviously work (as far as "CTIS Overspeed" goes) while the green controller is in place, so it would be hard to support that a faulty connection existed anywhere other than the controller connector itself. I do assume the flickering in the old green controller is a faulty...

It shifts pretty hard, I've thought mostly because it was brand new. They were replacing the transmission in my truck when they put it up for auction - Allison tech found a ground wire that needed to be moved to a different pin in the connector, and then it started right up.

Yes, I drove it around town for a while at various speeds up to 50MPH+. Sorry I wasn't clearer, that's what I was trying to say ("always blink "CTIS Overspeed" above about 35MPH"). Yes, I connected and checked that ground cable. If I put the green controller back in, it doesn't complain about...

Yes, that's what mine does, and only when the black controllers are plugged in. The original green controller doesn't have the overspeed problem (but does have the flickering problem, which is why I'd like to replace it). Do you have the black controller?

I've read through the prominent threads on it, and they didn't have much insight on this issue. If it were the manifold, what would the theory about how it causes a CTIS overspeed be? That it's incorrectly reporting the pressure? And why only with the black controllers? I've tried thinking...

Since I got the truck, my CTIS mostly works, but often flickers like SGTHoffer's video below, and sometimes goes 5-flashing (that shutting off the truck and restarting, as the manual says, seems to usually correct). I have a '97 M1078(A0), with the green CTIS controller. I've tried replacing...