1993 Cadillac STS Northstar Code S043 Help?

Hi, I have a 1993 Cadillac STS with a 4.6 V8 Northstar Motor. I did a code run on it and came up with the S043 Code that is current. I looked it up and it means "Speed Signal Fault"
Does anyone know what this means? Also where its located on the car and steps for fixing it?
Id appreciate any help anyone can offer!
 
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