2014 Tesla Model S fuel system problems

Filed Nov 22, 2025 · Electrical, Fuel system · CA

After a high-voltage junction box repair performed by Tesla, the vehicle shut down 15 miles after leaving the service center. Tesla replaced the high-voltage harness at no cost but provided no explanation. After the HV harness replacement, new proximity/sensor alerts began triggering that were not present before their HV work. Multiple reasonable diagnostic procedures were refused, including bench-testing the sensors. Tesla is pressuring me to take possession of the vehicle without providing written confirmation that it is safe to operate following the HV system failure and subsequent replacement of HV components. I am concerned the vehicle may have unresolved high-voltage or wiring issues that could pose a safety hazard.

Filed Jan 17, 2025 · Fuel system · VA

The drive unit was leaking coolant into the electrical inverter space. The issue was verified by a mechanic who then repaired the drive unit to prevent additional coolant intrusion.

Filed Sep 10, 2024 · Electrical, Fuel system · FL

Overnight while plugged in and after the battery showed it was fully charged, the battery suddenly lost charge, and the car sent repeated alerts to immediately pull over and stop driving. A notice on the car showed mileage was reduced and to immediately schedule a service call. After returning home, I downloaded to the car a recent software update that cleared the error. However, after the software upgrade, Tesla messaged that they did removed tests and the high voltage battery must be replaced.

Filed Sep 26, 2020 · Fuel system · 158,000 miles · NY

Tesla ota software update 2019.16.x capped battery capacity to 72.8 kwh, previously 85 kwh, vehicle was stationary.

Filed Jul 9, 2020 · Fuel system · 90,000 miles · CA

The battery range on the car was limited by 10% in order to prevent a fire from happening.

Filed Jun 29, 2020 · Electrical, Fuel system · 59,750 miles · IL

While parked with the sunroof open, when I went to re-enter the vehicle, the main screen (mcu) remained blank and never came back to life. While driving home, I was unable to use turn signals, adjust basically any driving items including suspension, drive mode, steering controls, HVAC, lights, or close the sunroof. The car was technically able to be driven, but I also had no light control, no back up camera, and it could only charge at a basically unusable speed. Tesla's only fix was to replace the entire mcu unit.

Filed Jun 24, 2020 · Electrical, Fuel system · FL

My car experienced the issues described in the federal safety agency action number pe20010 with a premature mcu failure due to the emmc card failing. This emmc card has been found to fail too quickly due to tesla allowing debug logging to the emmc card that is not needed for normal vehicle users. This excess logging was confirmed by elon musk on october 12 2019 https://twitter.com/wk057/status/1211704973970550785. This expensive fix after failure had to be repaired out of warranty for a large cost. This failure causes the rear view camera to fail to work, the climate control to fail to work meaning that defrosting does not work causing potential vehicle issues, and potential slow charging of the car. The car also takes about 30 seconds to a minute to get out of park while the vehicle subsystems "fail" the mcu also causing a safety issue if the driver needs to get out of a troubling situation quickly.

Filed Mar 6, 2020 · Electrical, Engine · 50,000 miles · IL

Re: the federal safety agency action number: dp19005 - investigation subject : battery management software updates - vehicle had sudden loss of battery capacity and charging velocity after software update in may 2019. This has continued with a roughly 15% reduction in the kwh rating of the battery (published rating 85.0, actual 71.65). I am disappointed with the reduction in the performance and usability of the car, but more concerned with the potential of an undisclosed defect or risk that I am am not aware of.

Filed Mar 4, 2020 · Fuel system · 65,000 miles · OR

Re: the federal safety agency action number: dp19005 - investigation subject : battery management software updates a software update in may 2019 is when this began, tesla has capped the max voltage the high voltage battery would charge to, should be 4.2 volts and now its 4.08 volts. Tesla claims this was done "out of an abundance of caution" after several non-crash fires happened to these models. Tesla took action to downgrade horsepower and range along with all other aspects of performance through a total voltage cap after claiming to be releasing a fire-safety update. There has been no official safety update to date. This change happened while the car was parked in my garage and stationary.

Filed Feb 22, 2020 · Fuel system, Transmission · 61,000 miles · CA

Tesla has limited charging speed after a 2019.16.x software update to almost 3x slower, following reports of fires with cars while just sitting there. The car has additionally began deteriorate quickly as distance available to drive after the 2019.16.x update has gone down as well. This is now known on the internet as "batterygate" and "chargegate". Due to lack of communication from tesla on this issue and fires surrounding cars with similar batteries, I am not confident the issue has been resolved with just software and the car is completely safe to operate with the battery it was sold with. I am not even sure it is safe to sleep under the same roof as where it is being parked.