2013 Nissan Leaf Engine problems

Goodness my 2013 nissan leaf was park in the recreation. The car won't start because there are ev systems warning icon display on the dashboard. I had to tow my nissa leaf to broadway nissan dealer. Everyday the service advisor told me that they are waiting for leaf engineer to look at the problem. They cannot find the problem and this is a non-comment problem. I told the service adviser this is not acceptable. Everyday their excuse still waiting for leaf specialist to come and look at it and they cannot find the issue. *Tr

When in operation the car emits a high pitched sound that after driving it daily for 3 weeks causes my ears to constantly ring after driving. Nissan and the service center checked the car and determined there are no engine error codes and the car drives great. They drove the car and were not able to hear this high pitched sound, yet I hear it every time I drive it and I worry that it might be causing auditory damage or be generally unhealthy. It would be reassuring to have the frequency of operation checked to make sure this is not operating at an unhealthy frequency/intensity level. *Tr