Kevin,
When you brought your vehicle in, the Technicians found a slew of DTC U-codes (U0155, U0164, U0184, U0198, U0199, U0200, U0214, U0230) which are codes determining there is a break in communication with various vehicle modules and a Technical Service Bulletin from GM relating to a repair needed. Technicians also found DTC code P0513: Immobilizer key incorrect. Starting the vehicle with a bad key may have been attempted, leaving said code in the system. Vehicle had a broken Side Object Sensing Module that is broken on the RH side. Technicians found that the sensor rotted off the wiring harness and part of the sensor module is stuck in the harness. Vehicle needed a new harness connector & sensor module. After testing the starting & charging system, we found that the Starter Assembly wasn't properly functioning and would need to be replaced as well. So it was a multifaceted issue coming in. Upon return a week or so later, the vehicle had a slew of communication & Body control module codes that were in the vehcle's ECU, which told us that it needs more service, services which at this point go beyond our expertise and would need to be seen by a GM dealership. we hope this clarifies the issues at hand. Issues with vehicle communication between modules need to be addressed by the Dealerships, which is unfortunate but that is the case with your vehicle. We hope to see yu soon. If you have any questions, feel free to reach out.

We appreciate you choosing our shop to repair your vehicle. I do apologize for not calling you sooner, but that day was a bit hectic and we were short a technician. I'll be sure to keep you better informed in the future, and hope you are happy with the quality of work done to repair your exhaust leak.