2020 Tesla Model 3 electrical system problems

“The contact owns a 2020 Tesla Model 3. The contact stated that while driving at an undisclosed speed, the safety features independently deactivated. The contact purchased and replaced the battery. The vehicle was taken to the dealer, where it was diagnosed with ECU failure. The contact was informed that the ECU needed to be replaced. The vehicle was not repaired. The contact stated that an unknown software update was completed in June 2026. In addition, the contact stated that the unknown software update caused the ECU to fail. The manufacturer was made aware of the failure, and a case was filed. The contact was informed that the failure was a known failure with similar vehicles. The failure mileage was approximately 80,000.”

“I was operating my Tesla with Full Self-Driving (FSD) engaged when the incident occurred. I was turning right onto [XXX] from [XXX] and was positioned in the left right-turn lane approaching a railroad crossing. The railroad crossing gates were already fully lowered, indicating an approaching train. Despite the lowered crossing gates, the vehicle accelerated forward into the crossing rather than stopping. The vehicle drove through the lowered crossing gate, which struck and shattered the windshield. Seconds later, the train passed through the intersection. I did not command the vehicle to proceed through the lowered gates. The incident resulted in significant damage to the windshield and raised serious safety concerns because the vehicle entered an active railroad crossing immediately before the train arrived. The vehicle was towed to a Tesla Service Center due to the damage. Fortunately, no collision with the train occurred and there were no injuries, but the incident had the potential to result in catastrophic injury or death.”

“The wiring in my trunk harness was severed due to the repeated opening and closing of my trunk. This caused my reverse lights to fail and my trunk latch to stop working. This issue is part of a known recall: Campaign 21V-00D. Tesla attempted to fix the issue in 2023 but the poor repair did not work. I took my Tesla to the dealer and they refused to remedy the issue unless I would pay $1300. I persuaded them to lower the feet to $300 but still feel that I should not pay anything because this issue was due to the recall.”

“The screen (which controls all functions of the vehicle) starts to go haywire. It's almost like there is a phantom touching the screen and pressing buttons. The screen will start zooming in and out - changing your navigation destination. The air controls will turn on full blast and then you are unable to shut them off because the screen will not respond. It becomes a giant distraction to the driver (imagine a screen that large malfunctioning) and tesla does not think this is a safety issue. We reported it to them. They couldn't replicate the issue (is what they told us and then let us know it was out of warranty and we could just replace the screen to a tune of almost $2000). There are no cracks or issues with the screen itself. I cannot upload the videos as they are too big to share but I can send them to an email address.”

“My Tesla Model 3 was brought to Tesla Princeton Service Center on February 27, 2025 for a 12V battery replacement. During the service visit, Tesla also replaced the rear glass, citing the rear defroster as the root cause of the battery drain — a repair that was added without prior discussion and increased the total invoice from an original estimate of $180 to a final charge of $1,730. Upon picking up the vehicle, the rear backup camera, blind spot cameras, navigation system, Sentry Mode, and windshield wiper sensor were all non-functional. None of these systems showed any malfunction prior to the service visit. Tesla Princeton’s service advisor denied responsibility without performing diagnostics, and in a subsequent message admitted he could not determine the cause with certainty without diagnostics — which have still not been performed. The vehicle was discharged from a licensed Tesla Service Center in a condition non-compliant with FMVSS 111. I have escalated this matter to Tesla executive leadership in writing and am filing this NHTSA complaint to create a federal record of this safety violation.”

“After loading our two children ages 2 and 5 in to vehicle and securing in car seats, the car doors were closed and would not reopen. The children were unable to open the doors themselves. The trunk and other entries did not open. There was no obvious way to open the doors or the issue the car was experiencing. The battery cover would not open. Eventually after I searched the Internet I determined that the 12V battery died (no warning whatsoever, doors worked before loading children) and this caused all occupants to be detained in vehicle as the emergency release is the mechanical means of opening the door and this emergency release is not intuitive or obvious. Within 20 minutes I was able to use an arcane hot wiring method to unlatch a door with a spare 12 V source and a hidden 12 V port not immediately obvious either. Thankfully not in setting of an emergency, not a sunny or excessively warm day and had internet access to research this event. If any of the above were true, life limb and property loss would easily have occurred.”