Sounds like BS to me as well, however what was the code? When I started to throw codes on my 07 C&C in 08 after I put some miles on it, I purchased a Code reader. There are many on the market, but the one I bought and really like is the Kiwi WiFi II. You must also buy an App to use it on your phone or Pads and even some app capable auto radios. I chose Dash Command for my App on my iPhone 4 & 7 and iPad.
The $85.00 service charge (back in 09) was starting to add up, and it was allways related to a battery issue, which no recommendations were given. It turned out later, that my Batteries were weak and was causing the codes. With the complicated emissions, I didn't want to ignore the CEL's and paid for 3 different trips to my local Dealer. Thats when I chose the Kiwi wifi II, and have never paid for stupid CEL's since.
https://www.plxdevices.com/Kiwi-OBD-OBDII-Interface-Gauges-Scan-tool-Diagnostics-s/195.htm