My wife took our Buick Enclave to this dealership with the side detection and rear back-up detection showing errors. The errors were due to the fuse blowing as one of the modules were shorting out. We had our local mechanic determine the problem was the left side detection module had failed. My wife took the vehicle to Capital Chev with the mechanics report. They informed her that they needed to replace both side detection modules and also troubleshoot the rear detection system (verbal quote was over $3000). When questioned, the service representative told us that the modules were 'matched' and both had to be replaced (lie). I asked if they had separate part number to which he replied yes so they could be replaced individually. He then told me that the mechanic told him they were very corroded and looked like both were failed (he hadn't checked them with a meter to see if they were shorted). I requested that they just change the one that we knew was failed. The service tech then informed me that they needed to pull the bumper to replace the module. This was an outright lie as I had inspected the module before I brought it in, and it was very accessible in the rear quarter panel (couple of screws and an electrical plug). It should be a maximum 15-30 minute job. We were charged $300 in labor. We received the failed module back when we picked up the vehicle and it is a totally sealed unit, so there is no way the mechanic would know if the unit was corroded inside or not.
I was lied to several times during my communications with this service department. I would like to think that they didn't proceed down this path because they were dealing with my wife and that they assumed they could just tell her that all these parts needed to be replaced and she would proceed without questioning it because she wouldn't know better, but it really looked that way.
This is the first negative review I have written about a dealership, but I would avoid this service department at all costs and definitely not recommend them for any kind of work. They were blatantly dishonest and did not have my best interest in mind.
BTW - After insisting that they replace the single module that we had already troubleshot, the system worked fine. The part cost $720 and I was charged another $420 in service and fees.