2015 Tesla Model S fuel system problems

Filed Jun 2, 2026 · Electrical, Engine · TN

Following a coolant rapid mate replacement performed by an authorized Tesla service center, the vehicle experienced a complete shutdown on a public road the same evening it was returned. The high-voltage cooling system was not properly purged of air following the service. This caused low coolant flow to the rear drive unit during a 63-mile drive in record heat. The fault cascade included a HIGH VOLTAGE ISOLATION FAULT (BMS_f123), drive inverter warning (DI_w126), and multiple battery management warnings. The instrument cluster displayed a red emergency warning: "Vehicle shutting down — PULL OVER SAFELY." The vehicle required towing. The failure was confirmed by the service center's own follow-up invoice, which documented "trapped air pockets in the coolant system following the most recent service" as the cause. The corrective repair was performed at $0 as a Goodwill service — the service center's internal acknowledgment of liability. The service advisor made a written text admission of causation the following day, then retracted it in a recorded phone call. Both are preserved. No post-repair Isolation Resistance test results were provided. The HV isolation fault may indicate latent thermal damage to HV insulation that could cause a safety failure at higher mileage outside any remaining warranty. The vehicle is available for inspection upon request.

Filed Sep 11, 2025 · Engine, Fuel system · MI

was driving Tesla when warning light appeared “ charging declined “ . drove car home battery no longer charging . Tesla stopped working after only 68,000 miles . Tesla wanted $15000 to replace the battery more than the car is worth.

Filed Apr 18, 2024 · Electrical, Fuel system · TX

The component that Tesla has stated is the part that is failing is the MCU (Media Control Unit) which was a recalled part at one point but then Tesla decided to replace only a single part of the MCU which was the eMMC (embedded MultiMedia Card). Luckily the vehicle was not driving when it completely shut down and would not start back up but I was stuck in a restaurants drive-thru for roughly 4 hours till I could get a tow truck to come tow it. The tow truck had to put the car on dollies as the vehicle would not enter tow mode nor would it enter its emergency neutral mode so the vehicle could be moved. The windows would not go up or down and luckily the trunk was able to open because if not then I would have been stuck outside my vehicle as the door handles did not come out after I got out of it and closed the door behind me. Please read the messages from the tech as you will see that they tried to act as if they did not know what was going on with my vehicle but then i asked something else and they stated exactly what the issue was but supposedly could not confirm it was that unless they charged me a diagnosis fee and "got hands on" which I'm sure that info of what was wrong with my vehicle was nothing they needed to get their hands on. There were no warning lamps or messages UNTIL the vehicle shut off on me in the drive-thru and then the warnings started to populate staying that the vehicle was off, vehicle could not detect brake being pressed, and that the vehicle was not detecting the key. The repair estimate is no longer available in my app for some reason, probably because I did not repair the vehicle as they were wanting me to upgrade to the new MCU that is in the current vehicles and it would have been roughly $2,400.00. Just today, the vehicle would not start, would not move my seat or anything to its memorized position when I got in the vehicle and the screen was frozen, just as it did when the original recall happened of the MCU/eMMC, photo/videoattached.

Filed Dec 13, 2023 · Acceleration, Fuel system · CA · crash

The Model S, which was bought in 2015, had a sudden acceleration while I was trying to park near the entrance gate of the parking lot. The accident happened on May 25, 2023. Fortunately, nobody got hurt and the car was totaled. I feel strongly that this should be investigated, as this can be a very serious public safety issue. It was inspected by the insurance company. There were no warning messages prior to the failure.

Filed Jun 10, 2023 · Electrical, Fuel system · CA

My MCU (onboard computer system) glitched out and the screen began flickering. I lost all of the Advanced Driver Assistance Systems, navigation, music, phone link, sunroof venting, climate control, including defrost. The screen froze and I had no functions. This has happened 4 times, possibly a 5th time, while driving in the last 6000 miles. I put in a service request to Tesla and they ran a remote diagnosis, and told me that the old MCU1 is overwhelmed by the new software updates. Their solution was for me to upgrade to the newer MCU2 at my cost. I am afraid to drive my car as it will malfunction while I need the safety features, like basic defrost or AC in the 105 degree heat in Phoenix. Tesla acknowledged that the previous MCU1 failure due to the eMMC chip was a recall, but this is a new problem that has not yet been acknowledged by Tesla as a recall problem.

Filed Nov 30, 2021 · Fuel system · KY

The car will issue a BMS_w035 warning which is connected to the battery heater failing/failed. In this case, the car may not restart, per Tesla's on-screen warning. If this occurs while driving, or in stop-and-go traffic, this could lead to a dangerous situation of not being able to remove the car from the road safely without a tow truck. From recent incidents online, this is occurring in many 2014-2016 Model S vehicles with the colder weather change.

Filed May 4, 2021 · Brakes, Fuel system · 48,000 miles · TX

After having my battery coolant heater replaced on february 22, 2021 I noticed problems with my car starting up slowly. Note error messages were noted on my vehicle however. On march 10 while driving home from work on a smooth straight freeway the entire electrical system in my car failed causing propulsion to go off line and the brake pedal to lock up and become non-functional until the system rebooted. For approximately 20 to 30 seconds it was impossible to depress the brake pedal. Fortunately I was on the freeway and pressing the brake pedal wasn't required. I am concerned about the safety of this vehicle now since I had mistakenly believed that there was redundancy in the systems that would preserve brake function in the midst of a power failure. There is no manual hand brake. I am extremely concerned that a system failure like this could happen again as I am approaching an intersection, a school zone or going down a steep decline. I have attached invoices from the original service with the battery coolant heater that was replaced as well as the subsequent service after the incident where the technicians identified that the drive unit was improperly connected

Filed Apr 25, 2021 · Fuel system, Seats · 92,000 miles · CA

Issue 1). Ever since I bought the car I noticed the drivers seat felt cooked causing low back pain. Eventually the seats power adjustment would only retract one side so it could not be adjusted evenly and I had to pay to have a whole new seat replaced issue 2). I have the 85 kw battery and after an update my battery capacity was reduced 10%. I was told it was due to risk of overheating the battery fire risk tesla never resolved the issue and never reinstated the missing 10% charge capacity 3). The suspension had failed as I was driving over a speed bump less than 10 MPH and the bottom of the car scrapped the pavement. I had to pay out of pocket to replace the suspension

Filed Feb 7, 2021 · Electrical, Engine · 14,000 miles · TX

Tesla has reduced the charging capacity and charge rate per: re: the federal safety agency action number: dp19005 - investigation subject : battery management software updates prior to this software update, the charge rate was double the shown rate.

Filed Jan 25, 2021 · Body, Fuel system · 42,900 miles · TX · fire

On afternoon of november 23, 2020, 2015 tesla model s 85d was in motion with single occupant, turning right turn into residential area off city street. Driver heard loud and deep metallic sound and immediately slowed. Warning message similar to 'unsafe to drive, pull over safely' appeared on dash. Driver stopped car right away and heard 3-4 loud, identical sounds. Driver heard another sound followed by loud 'pop' and smelled something burning. Driver immediately exited and saw smoke billowing from below the vehicle. Driver moved away. There was another loud 'pop' sound and flames started visibly shooting outward and upward from the front passenger wheel well area, mid-cabin and rear passenger tire well, charring the curb and grass next to vehicle. Fire continued to burn through passenger door, front of car (frunk), and underside of the car. Fire department and police department arrived on scene within minutes and extinguished fire. Fire damage to exterior was visible to front tire well and front passenger door. Additional fire damage noted inside rear passenger door. Cause is currently unknown.