my 99 blazer has recently started acting up. under light acc the trany seems to hesitate shifting up causing the vehicle to surge a little.

took it to mech who said it was trany problem took it to tranny guy who sadi take it to chevy dealer took it to chevy dealer who says nothings wrong.

trany guy said that the on board computer is registering the truck in 4 low even thought it is in 2 high and this is why the rough shifting. the dealer told me they reset error code B1875 i think he meant P1875. as well the gas millage has gone way down from 350 km to a tank down to 200+ dealer tried to say that this is because its colder this time of year.

any help would be great
thanks
graham
welp
ellis

 

Do a forum search for P1875. There is a good explaination, and it sounds like it fits your problem!

 

if you have found out your problem what was it

 

yes i figured it out ( someone from this forum helped me )

It was my TCCM the transfer case control module it would tell the transmission that I was in four low even thought I was actually in two high and would reset the error codes when there was one because even thought the module was acting up it was doing it within its regular job. I did pull apart the wiring harness and checked it for a cracked/faulty wire as well just in case but they were all in good shape

I purchased one from a supplier in Texas I cant remember who it was right now but it was a factory direct part still sealed with a factory security sticker but was 450 dollars compared to 1000 from my local gm dealer

hope this helps you out

 

ouch!!!! this just started today!! and only with the 40 or lower temp..... when it warmed up this afternoon it was fine......