I am trying to help a co-worker to find out this code and what it is. Can any of you truck peeps help me out.

(P1870 code)
1997 GMC Sierra 1500
350 engine automatic

(he says it has a trailer package that might have had a more heavy duty tranny in it.)




Thanx!

 

Transmision componet slipping

 

He was thinking it might have something to do with the valve body that he read somewhere.

 

i looked the code up in my book and that is what it told me. Is that the only code it is throwing??

 

Yes. he says that the tranny onced warmed up shifts like it has a shift kit in it.

 

Is the tranny stock?? It should shift a little firmmer when its cold, not when its warm.

 

No it is a bone stock truck he drives to and from work. (not a hotrodder)

funny note did you mean SHIFT or **** when you typed? LOL

 

Yah sorry about that, im ****** tired. Well, I checked the code number and it said "Transmision Componet Slipping" and that all it gave me.

 

Thanks for the help and I will send him this link so he can read it.

 

It shifts hard because it is going into failsafe mode. Usually the ones we see will do it after driving about 30-40 miles when they first start acting up. If the convertor clutch has not been "blued" or overheated, you can ream the tcc reg. bore in the valve body to fix it most of the time. If not ream or replace the valve body, new convertor and input shaft o-ring.