Rear wheel speed sensor?

[Vinceg]

Hey Guys I have a 2002 GMC Sierra 1500 2wd. I picked it up for cheap and have been trying to get it ready for a safety inspection. The thing runs good but had a pile of abs codes in when I first got it home. I've cleaned the grounds replaced both front wheel speed sensors. Now I have a rear left wheel speed sensor that comes in and the abs activates at low speeds. Problem is I have no rear speed sensors on the truck. I called the dealer and they took my VIN and said that is funny that you would be getting that code because your truck doesn't have rear wheel speed sensors. HELLO! Why do you think I'm calling. LOL! They weren't much help. I also had the code for the EBCM come in as well. It cleared and hasn't returned. I pulled it and cracked it open and that's as far as I've gotten tonight. Any helpful hints?
Thanks Guys.
Vince,