I did an install on a 2017 Hyundai Sonata. I did the install and everything worked perfect. Flashed it to the latest firmware. 1 week later the check engine light is on and he is blaming the remote start and is demanding it torn out, which is not going to happen. I know a number of the chryslers need the firmware rolled back because of timing of signals on the can bus. Can this most likely be fixed by changing the firmware setting? I have not checked the CEL codes yet, and the vehicle is an hour away. I also do not have the serial number on hand, It was done with an Evo-All and Viper 4806V. I have done dozens of installs with this unit combination and never had an issue. I would really appreciate any help.