03 gt auto speedometer acting wonky

Phatt_daddy

Member
Apr 22, 2005
213
1
19
Hytop, AL
I recently picked up an 03 gt auto that is now giving me issues. My speedometer will set fine at speed for a little bit and even the cruise works great until the needle starts jumping. By jumping I mean it’ll peg out at 150 if I’m going 70 and cut cruise off. I’ve narrowed it down to the vss but in looking on rock auto it shows 2 different ones available. One for the transmission and one that is a dif mount. Which one goes to the pcm? Cause I’m figuring that is the one I need to replace.

thanks
Nate
 
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Onesick99GT

Active Member
Nov 20, 2018
340
40
38
33
Dayton, Ohio
It's your Speed sensor on the transmission. It's on the right side of the tranny or driver side .Mine started doing the same thing. Replaced it and it's good now. Mine would read 0 and then randomly bounce to 150 and back to zero. The magnet in it finally wore out.
 
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