2018 Tesla Model 3: engine overheating

Filed Sep 6, 2026 · Acceleration, Electrical · AL

While my wife was driving, the high-voltage battery failed and the car went into reduced power/limp mode. Tesla later determined that coolant had gotten into the high-voltage battery and caused it to fail. My main concern is that we had no warning that there was a coolant leak or that coolant was getting into the battery. There was no low-coolant warning or anything telling my wife that there was a serious problem developing. By the time the car started giving high-voltage and reduced-power warnings, the damage had already occurred and Tesla said the battery needed to be replaced. What concerns me even more was what happened after Tesla received the car. Tesla removed the battery and quarantined it in the parking lot. They told us in writing that it was removed because of coolant ingress as a safety precaution and that a specialized technician had to determine whether the battery was safe to discharge. During a phone call, a Tesla employee also told me they quarantined it because there was a possibility the battery could explode and they did not want anyone injured or anything damaged if that happened. That was alarming because my wife had just been driving this car, and afterward it sat in our driveway while we waited for it to be taken to Tesla. At no point were we told that the battery could be dangerous or that the vehicle should be kept away from people or property. We had no idea Tesla would consider the condition serious enough to quarantine the battery once they received it. Tesla later confirmed in writing that coolant ingress was the root cause of the battery failure. I would like the federal safety agency to look into why this condition was able to get this far without warning the driver and whether other vehicles could have the same issue.

Filed Jun 15, 2025 · Brakes, Electrical · AL

My brake lines began to leak. When I took the car to the Tesla Service center they repaired the brake lines, but in the process they found that the brake fluid had leaked in/on the battery compartment. Furthermore, they found a coolant leak that also leaked on/in the battery compartment. This cause a hole to develop into the battery compartment. Having the coolant and brake lines in a place that could affect the batteries is a significant design flaw of the Model 3. According to the technician from Tesla, my car/batteries, were a ticking time bomb and could have ignited at any point. I am very fortunate that a fire was not started with myself or my family in the car. I believe Tesla needs to make all Model 3 owners aware of this possibility and come up with a way to remedy this flaw before someone looses a life. If the brake lines on my car hadn't sprung a leak, I'm not sure I would have know about the coolant leak until it was too late.

Filed Mar 27, 2025 · Engine, Transmission · CA

On March 21, 2025, my Tesla Model 3 Long Range entered "Power Reduction Mode" — a safety feature that limits power to protect the high-voltage battery from overheating or failure. Tesla later diagnosed a coolant leak near the battery area. Their own service advisor stated in writing that the failure was “most likely related” to the battery’s thermal management system — the very system responsible for regulating battery temperature and preventing damage. Despite the connection to the battery protection system and the vehicle being under the 8-year/120,000-mile battery warranty, Tesla has refused to cover the repair. The issue remains unresolved, and I have not picked up or approved any repairs on the vehicle. My concern is that driving the vehicle in this state — or leaving this failure unaddressed — could lead to further battery damage or pose a safety risk. I am requesting that the federal safety agency evaluate this issue as a potential safety concern, especially as the manufacturer is refusing to repair a system directly linked to high-voltage battery safety.

Filed Oct 18, 2023 · Airbags · TX

Received a Front passenger safety restraint system fault warning on my Tesla that went away but the service tech claims that they don't see that warning when brought to service center. I am concerned that they are not transparent or not seeing something that I clearly saw. Or if there is some software/technical glitch that displayed it. They were not clear on why it showed to me. The other issue is related to A/C compressor failing due to their software for cabin overheating. I had to pay for the A/C compressor to be replaced but feel that their software contributed to the problem.

Filed Feb 21, 2023 · Driver assistance · 99,000 miles · CA

The contact owns a 2018 Tesla Model 3. The contact stated while driving 65 MPH, the contact attempted to activate the Autonomous Self Driving feature; however, there was a message stating that the Forward Collision Avoidance: Adaptive Cruise Control inoperable was unavailable. The vehicle was taken to the dealer for diagnosis and the dealer stated that an unstated computer needed to be replaced due to overheating. The vehicle was not repaired. The manufacturer was contacted and stated that the vehicle was not under recall, and that the Warranty had expired. The failure mileage was 99,000.

Filed Sep 22, 2022 · Driver assistance · WA

Tesla Model 3 (and other models) comes equipped with side cameras on the vehicle's B-pillars. Tesla has designed these components to allow cabin air to infiltrate the space between the cameras and the exterior glass. Of course, this means that humid cabin air will condense on the glass when ambient conditions cool the glass enough. This blocks the cameras, causing certain features (e.g. blind spot camera, auto lane change, lane keeping assist) to stop functioning. These features have been actively advertised by Tesla and sold for thousands of dollars as software upgrades, but do not reliably function because of this design flaw. As can be seen on many internet forums (e.g. https://teslamotorsclub.com/tmc/threads/b-pillar-cameras-fogging-up.172226/page-8), this issue has been known for years, yet Tesla has provided no fix for the problem. As recently as Sep 2022, their service centers are still telling customers to run cabin heat to eliminate condensation, but the cameras are well insulated, thermally, from the cabin (see Page 2 infrared pics https://teslamotorsclub.com/tmc/threads/camera-condensation.168472/page-2), so this does almost nothing, while potentially overheating the occupants. After 3-4 years, it is clear that Tesla is not interested in taking this design flaw seriously, and will only act if forced by safety regulators. This is an integral part of what Tesla has marketed as their cars being "safer than humans", and it's unable to cope with normal weather conditions (I live in Seattle, WA and routinely see this in temps as high as mid-50s to low-60s).