'97 LT, 4X4, 3.1ltr., auto trans.Got these codes that all came up at once: PO785,P1860,PO440,PO740,PO758. I know most of them has to do with the trans., but the question I have is I pulled these codes when the service light came on, now the sevice light is off. What the heck is going on? On off, on off.
Also the vehicleseem to runfine too while the light was on. I have had this problem with the light coming on and then going off in the past and has seem to be stuck in low gear and wouldn't shift sometimes.Are these codes a warning sign of things to come with the trans.? I rarely do any pulling. Thanks for the suggestions andhelp.

 

A 3.1L in a Blazer? That's a new one. Did you swap engines at some point?

 

Its probably a typo rriddle3 probably ment 4.3!!

 

It could be a ground propblem.
Cal the dealer and ask the guys in the service department.

 

Oh yea......it's a typo. Sorry about that. I've been working on my Pontiac. Have 3.1 in my head. Anyways, thanks, I'll try calling the DEALER but I'm sure they will say : Bring her in and we'll take a look at her so we know for sure. We'll start you a tab right away.