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Vss location?

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kylersjimmy

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surprise arizona
Hey guys I'm new to ck5 and wasn't really sure where to post this, but I have a question about the location of the vehicle speed sensor on my 1987 gmc jimmy?
It's a 5.7l tbi with a 700r4 and a np208, I read somewhere that it was located on/behind the speedometer but when I go to auto zone -__- they pull it up as a $160 vehicle/transmission speed sensor located on the transmission? My truck is throwing a check engine code for the VSS and running really gutless and gets WAY worse gas milage than usual this is all following my speedometer stopping working ? When my teacher helped me pull that code and said it was in "limp mode" ? I didn't even know my truck could do that? Lol


I also was wondering what all that would this cause? I read bits and pieces but can't seem to find a straight forward answer so I turned to here and made an account!

Anything and everything is much appreciated please and Thankyou! :)
 
Hmmm then why would my truck throw a code for that? I was told by a friend it was on the back of the cable drivin speedometer and that it tells the ECM how much fuel/air to take in and what not? It's an az truck from what I know? Dad had it since 99? My truck had also been shutting off while driving and not wanting to start like it's out of fuel just recently? :/
 
VSS started in ~1982 or so for cruise. All TBI has VSS.

The problem is most likely not the VSS. The speedometer failure is the likely problem, and since the speedometer isn't working, the VSS isn't working, and the ECM is the only thing that can "report" that problem.

It is indeed connected to the back of the speedometer, but don't focus on the VSS issue. Find out why the speedometer doesn't work (I'd start by disconnecting at the t-case, and turning the speedometer cable with a drill to see if gauge responds), fix that, and I'm quite confident the VSS will work.
 
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