After a backyard mechanic nightmare I finally got my car running good the only problem I failed to get rid of is this minor buzz coming in around almost 2k rpms . It sounds like it could be a bad wire but I'm not sure. I've read around and I'm not having any tranny issues(replaced about 6k miles ago) and the engines driving fine. Its just this buzz going on.
The only light I have on is a SES light with the following codes:

U1000 (CAN Communication Line)
P1815 (Manual Mode Switch)
P1705(Throttle Position Sensor)
P0430 x3 (Believe this is from hole in exhaust i plan to fix when I get refund)
P0420 x 2 (same as above)

Video of buzzing sound: Comes in at 0:14-0:17 .
Do you think a small shop could repair it or should I look into taking it to the stealership

 

You can't hardly hear the noise in the video at all. Too faint almost to tell what it may be.

 

Sorry, this is a good as I could get . TURN YOUR VOLUME TO MAX GO INTO A BASEMENT AND PLAY FROM 14-17 seconds lol....

I believe its a bad harness wire connector thats throwing all those codes . It sounds like a bad/shorted wire somewhere . Almost has the sound of putting aluminum foil in the microwave . Just a quick buzzzzz

 

Update: I reset the ECU now there is no SES light yet. Hopefully it doesn't come back on while on the drive to school. If it does I shall take it to the stealership

One of the codes where my manual mode switch was shorted or open but before i reset the ecu i put the car in manual mode & it indicator switched. I didn't drive in manual mode in fear that ill screw my tranny (already went through that once)

EDIT: Drove to school, SES light didn't come on & I didn't hear that weird noise I was hearing before.

 

Misc , if you don't know my story Ill cliff it.

Took car to backyard mechanic to change spark plugs
****ed up car
Took it to a dealer & they fixed everything except 1 thing.

Dealer couldn't diagnose my buzzing noise( Nissan dealer . Car is infiniti)

My car makes some very weird buzzing noise behind the passenger dash/firewall . I really don't know what the hell he could've done to cause this by simply changing spark plugs.

Car is infiniti 04 g35x

Guy said he supposedly "Checked the wires" and nothing seems to be wrong with them. I believe they're bad grounds or something. Is this something i could try to check myself? Should I try the Infiniti dealer instead of nissan?

Could it be the tranny? It only does it between a certain RPM but very randomly. Usually when coming down from higher speeds or coming up from lower speeds

 

did you fix this?