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Yesterday my wife was going to the and when she put the truck in reverse it made a real loud screeching sound down below near the transmission. Now I have a basic code scanner and it gave a code C0237. When I researched it, it showed rear abs speed sensor. Now this vehicle does not have sensors in the back. Very confused now need help family.
 

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2006 Escalade AWD w/DiabloSport tuner,Jet Performance throttle body/MAF,Airaid MIT
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I believe the rear speed sensor throwing the code on your RWD 5.3 model is located on the transmission tail cone near the drive shaft. The rear tail sensor works with the front ABS sensors to detect abnormal wheel spin in the rear wheels from my understanding of early 3 channel ABS system before the change to the 4 channel in 2004+ models.
 
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