99 4l60e

[Dmcustomz]

I have a 99 k1500 suburban. I just got a tranny 4l60e rebuilt for it and it's throwing a p0740 code yeasterday and today it throwing the same code and a p0785 I talked to the tranny Guy and he says it's the electrical plug going into the tranny it might be dirty to clean it with brake cleaner. So I need some help with this issue. So if anyone has any ideas or could help me that would be great

[Dmcustomz]

One thing I forgot to say is. All the electrical wad tested with a tranny tester when it was rebuilt

[Alaskakarma]

One thing I forgot to say is. All the electrical wad tested with a tranny tester when it was rebuilt

You mean all of the internal electrical was tested? These transmissions sometimes have a habit of having the plug on the top passengers side coming loose. When they come off from the top they can get filthy. As soon as the plug becomes disconnected, the pcm will throw a bunch of codes at you. Po740 po753 po758 po785 p1810 p1860. This is because the pink wire in terminal e isn't supplying power through the solenoid circuit. The transmission will immediately go into limp mode. After cleaning the connectors, make sure you use dielectric grease when you connect them together.

 

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