Hello & Welcome,
What the next step would be is to have the diagnostic test codes (DTCs) pulled from the car's computer. This is done by connecting a scan tool or code reader to the diagnostic connector (driver side, near the steering column). The good news is, many auto parts stores provide this service for free, in the hopes of selling you parts to fix the problem. But the goal here is to get the exact error codes, which are usually 1 letter followed by 4 numbers. If you can get the code(s) and then post them back here, we can get a good idea of what is happening and continue to diagnose this issue.
I hope this helps. Please let me know what you find.
Take Care, Greg A.
Not a problem. Without knowing the code for the particular issue, it is difficult to say what the exact problem is - even for the folks at the dealer.
I would still recommend that you have the code read - for free - just so that you know what it is and that the dealer is not just "taking a guess" as to what may be wrong.