Six problems related to turn signal have been reported for the 2016 Tesla Model S. The most recently reported issues are listed below.
Vehicle main computer lags, reboots, and comes up with a black or garbled screen regularly, including while driving, especially when a usb stick is inserted and/or the dashcam functionality is in use. Tesla service insists it is a software issue (for over 1 year now) and has to date refused to replace any hardware despite spending several weeks of time attempting to fix the issues. The car has had 25 over the air firmware updates and has undergone two separate complete factory resets since my initial complaint to Tesla in July 2019. Symptoms prevent audio for turn signals and autopilot from working properly. Prevent backup camera from opening or displaying properly. Make using the built in navigation system and entertainment systems difficult and often dangerous, causing driver distraction. When the mcu reboots while driving it takes nearly 15 minutes for the nav system to restart. My tegra based mcu's emmc shows roughly 2400 / 3000 avg block erases, and 81 reserved blocks, not meeting the new thresholds set by Tesla engineering for replacement (which, for my h8g2d apprently require less than 65 resvered blocks remaining). The system has regularly shown squashfs errors due to corrupted memory.
Prior to 10/2/2020 numerous reboots usually after being parked. Had to wait excessive time since I had pin to drive enabled. Disabled pin to drive since I was getting stuck. It is embarrassing and not a good reflection on Tesla products to have to wait 5 minutes to move your car. Something is wrong. 10/2/2020 while driving on I 40 noted there was a lack of turn signal sounds. Noted navigation did not seem to be updating to current position. While on autopilot the car started to drift toward an exit. The autopilot had disengaged with no warning sound' nothing. Continued to steer manually. Screen went black. Ac stopped. After several minutes the screen rebooted. Had to re-input destination. 10/3/2020. Went to ashland nc supercharger to top off before getting on the blue ridge parkway. Was only getting 4 kw to start finally giving up after 30 minutes achieving a maximum of 10kw. When I unplugged I got a warning "reduced power, systems shutting down. Service required. Vehicle may not start". The screen went black and after time finally restarted and I was able to continue. Later in cherokee nc the screen again rebooted after charging at a j1772 station. 10/4/2020. While driving with on i95 near st augustine I noted the loss of turn signal sound again. The navigation was frozen again. Again there was no sound or warning disengaging or engaging autopilot. The screen went black. The ac went off. I observed the Tesla t come up then the screen went black again. Then the Tesla t came up a second time and after several minutes the controls started working again. Again at Nov 19@ 7:03 driving west in I-4 stanford, FL. Same as on 10/2. Loss of autopilot, loss of turn signal sound, loss of climate control, loss of music. Took 6 minutes to reboot. Took an additional 5 minutes for navigation to restore. There are more instances but I am out of characters.
Mcu - master control unit has failed (center touchscreen). Without it, the turn signals, hvac, radio, reverse camera, gps and remote connectivity do not function.
My mcu failed which caused a series of safety issues. The backup camera no longer works. I can not control exterior lights. I cannot use the front or rear defroster which is problematic since the ac is stuck on the on position which causes condensation to form on the windshield, but without defrost control I cannot effectively clear the window. In additional all sounds are disabled which means safety systems such as turn signals and other warnings such as forward collision warning do not work nor can these systems be adjusted.
Center screen shut off while driving due to a 'mcu' failure (diagnosed by Tesla service). I lost ability to control taillights, rearview camera, high beams, climate control, charging information, navigation, passenger airbag indicator. I was driving on a multi lane highway when it failed. Drivetrain, brakes and steering seem unaffected. At Tesla service they tried to diagnose, and one of the resets disabled turn signals, which is a legal issue in addition to safety. The screen had rebooted several times on its own in the preceding weeks.
The contact owns a 2016 Tesla Model S. The contact stated that while operating the vehicle, the mcu screen intermittently became inoperable. During the failure, the rear view camera and exterior turn signals were inoperable. The cause of the failure was not yet determined. A dealer was not contacted. The manufacturer was notified of the failure. The contact was informed that the vehicle was included in the NHTSA campaign number: 21v035000 (back over prevention, visibility, exterior lighting). The contact stated that the vehicle had experienced the failure listed in the recall. The approximate failure mileage was 15,000.