How did the mechanic diagnose it? Did he verify the 5V reference to the sensor and sensor ground then do a bypass test to check the wiring integrity? If not he wasted your time.
If you used anything but an ACDelco sensor straight from GM you wasted your money.
ScanXL will not help you. You need an uplevel scantool, and the new sensor has to be calibrated. Autel Maxisys or Snap-On will do the job.
Good luck.
Edit: Looking a little further into the wiring, if the high mount light is staying on then the problem could by anywhere from the sensor to the EBCM, a stuck BASS relay or any of the wiring. If the high mount light is not on, it could be the turn signal/hazard module.
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