• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Shifting issues with the 4t65e-hd in My 3800sc Fiero

D

deezil

New member
Hi All.

I hope I can get some help here with my 88 fiero gt. Years ago I swapped a 99 park avenue 3800sc and the 4t65e-hd trans into it. It's been fine for the most part.

Over the fall I ran into a shifting issue. Out for a weekend drive and all of the sudden the trans was pretty much in 3rd gear only for forward gears. Reverse would also work. But no shifting at al. I have a regals gs obd2 pcm that was reprogrammed by sinister performance. It threw a CEL and the codes p0758 p0753 and p1860 showed up. I can clear the codes with the scanner and drive it for a bit and its fine. Then at random it'll go back into this Limp mode with these codes being thrown.

Seems crazy all of these solenoids and tcc would go bad all at once. Anyone ever had this issue come up in their 4t65e trans? I'd like to figure out where to start at to get it figured out. I am all ears. School me.

Thanks for the help. I appreciate it.
 


It would be nice if you had listed what the codes stood for. Hang on.. I'm off to look them up.

Time Passes.........Time Passes..........Time Passes........

ok.. I'm back (anyone know where "time passes" came from?) I'd start off by checking the power going to the trans. You have a code for no power or odd power to solenoid a, another for solenoid and a third for the TCC soleniod. Since all three are reporting as having an electrical problem, you likely lost power or ground. You mention only having 3rd, which is the default if there is no power going to the trans.

Hope that helps
 
Not much I can add here. I think Bill is spot on. Just make sure you have a full 14 volts on pin "E" with the vehicle running. Since this is a swap and it's been fine for years, I would suspect a pinched, broken or frayed power wire.
 
You must log in or register to reply here.
Back
Top