2018 Tesla Model 3 transmission problems

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 Aug 15, 2026 · Suspension, Transmission · CA

I am reporting a front suspension failure on my 2018 Tesla Model 3 Dual Motor, that appears relevant to the federal safety agency Preliminary Evaluation PE26006 and similar to Recall 23V‑235. While driving slowly in a parking lot, I heard a clunk and felt the front wheel/steering alignment become slightly skewed. After entering the highway, the vehicle developed severe vibration and became unstable and difficult to control. I exited and stopped as soon as safely possible. While attempting to park it at a curb, during reverse, the suspension entirely collapsed and left front wheel was then severely displaced and the tire was rubbing the wheel well. Tesla inspected the vehicle and confirmed: “The left lateral link was found detached with missing hardware.” Tesla also found the left front halfshaft detached from the drive unit. Tesla replaced the front subframe, both front lower lateral links, both front lower compliance links, the left front halfshaft, and performed an alignment. Total cost was $6,328.96. The failed parts were replaced by Tesla; I do not know whether they remain available for inspection. This failure created a serious risk of loss of vehicle control at highway speed and could have endangered me and surrounding traffic. The problem was confirmed and inspected by Tesla Service. There was no collision or other discrete impact event that I recognized as causing the failure. There were **no warning lights, warning messages, or other vehicle alerts before or during the failure**. The first noticeable symptom was the clunk in the parking lot, followed by the skewed steering/wheel position and later severe highway vibration. I have pre-repair photos showing the displaced wheel, tire contact, and detached suspension component, as well as Tesla’s final repair documentation. I request that this incident be considered in connection with PE26006 and Recall 23V‑235.

Filed Aug 14, 2026 · Brakes, Transmission · MA

Description of the Safety Defect:My 2018 Tesla Model 3 AWD suffered an abrupt and catastrophic total loss of mechanical braking power while driving. The brake pedal went completely soft, and the vehicle lost hydraulic pressure.An independent mechanic inspected the undercarriage and confirmed that the factory steel hydraulic brake lines completely rusted through and ruptured, leaking all brake fluid from the system. This vehicle has 142,905 miles and has been operated in regions that use winter road salt.Tesla is aware of this severe corrosion defect under Service Bulletin SB-26-33-001, but they have categorized it as a service bulletin rather than a safety recall. A factory brake line rusting through to total fluid failure is an extreme and immediate safety hazard to occupants and the public. Furthermore, the vehicle simultaneously threw a "Front Motor Disconnected" warning. A federal investigation and mandatory recall are urgently required to ensure Tesla replaces these defective lines for all affected owners before a fatal accident occurs.

Filed Oct 21, 2025 · Steering, Suspension · IA

The front upper control arms on my 2018 Tesla Model 3 have failed multiple times, producing loud clunking, popping, and binding noises during steering. The issue has worsened and poses a serious risk of loss of control while driving. Tesla replaced these parts under goodwill in the past, but the failures have returned. The most recent incident occurred around 03/05/2025 at approximately 106,867 miles. The failure has been confirmed and documented by Tesla Service Centers, and I have multiple invoices showing repeated replacements of the same components. The problem directly affects steering and suspension safety.

Filed Apr 30, 2025 · Airbags, Electrical · HI

I just traded in my vehicle for a Tesla from 3rd party dealership on [XXX] A light came on once I reached my home. I called right away before the dealership closed but no one answered. So I took it upon myself to make a service call to Tesla to get my vehicle checked come to find out my vehicle has extensive damages from my unit drive, my subframe and the battery pack is severe punctures and needs to be replaced. Choice Automotive LLC in Honolulu Hawaii didn’t disclose anything to me before purchasing this vehicle. also they didn’t disclose that this vehicle was in a car accident, but they carried on with the sale. I have pictures of what needs to be repaired. Tesla said, I will need $20,000 to repair these damages. So I’m trying to take legal action against Choice Automotive LLC for selling me a vehicle that needs a lot of repair to drive normal again. I need them to pay for these repairs immediately. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

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 Dec 6, 2024 · Electrical, Transmission · SC

Power conversion system (PSC) failure. Only charges at 16 amps. I know other Tesla owners have had this problem as well.

Filed Nov 15, 2024 · Electrical, Transmission · MI

ISSUE: PTC Heater failed at 63,617 miles after 6 years of use WARNING MESSAGE: "Vehicle may not restart" CONTACT: [XXX] [XXX] main contact for owner [XXX] . VIN: [XXX] MAKE: MODEL 3 YEAR: 2018 REPAIR QUOTED: $1,104.18 LINE ITEMS: PTC HEATER DUALZONE(1088218-00-I) HVAC, PTC SERVICEASSY(1107677-00-A) LABOR & DIAGNOSTICS SUMMARY: TESLA Model 3 Electric Vehicle shut down into "Asleep mode" and will not respond (turn back on). Locked out. Will not wake up. Will not respond to software nor car keys. All systems turned off. Will not charge. Will not release charger from charge port. Issue suddenly happened after [XXX] software load (deemed to not be the cause of issue). Dealership diagnostic shows PTC Heater failure which cuts off the battery. Dealership quoted estimated repair (see below). This could have happened while driving causing the vehicle to be uncontrollable, and a major safety issue. Fortunately, my incident happened after I parked the car in the garage. Overnight there was a software install (supposedly not causing the problem). In the morning the vehicle would not turn on. PRECEDENT: There were several small claims filings in Canada for same issue. This was deemed a design flaw, and safety issue. (See [XXX] ) DIAGNOSTICS: On-line debugging is pointing to resistance issue with 1 of the 5 heating elements in the PTC Heater. PTC Heater cuts off supply to PCS which charges the 12V battery when there is an issue with the heater. This allows the 12v battery to drain, and the EV becomes unresponsive. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 15, 2024 · Transmission · GA

If both brake and throttle pedals are depressed simultaneously for a fraction of a second the software does two things: 1) raises a warning to that effect on the computer display and, 2) greatly reduces motor output, limiting acceleration. Item two is the safety concern. Removing the foot from the left pedal does not immediately remove the power restriction. There is a few second delay for that to take place. As a result I find myself expecting to be able to merge rapidly or complete a turn, or cross in front of oncoming traffic but am left in a precarious position in traffic unable to move as expected to avoid a potential collision. This is a behavior that I have not experienced with a conventional engine powered vehicle. In addition when this two-foot power-down mode is waiting to clear, and I am sitting stationary on a steep up incline, the vehicle can slip backwards downhill. The only solution to this issue may be to push the park button on the right control stalk to stop this rolling.

Filed Feb 26, 2024 · Electrical, Transmission · MD

PTC Heater failed. This is a critical component that helps to maintain the battery's temperature within safe operating range. The only alternative is to replace this PTC Heater. Till the replacement is done, EVs battery may not maintain safe operating temperature range and could cause the car - not drive able. I consider this a significant safety risk. Cabin temperature cannot be maintained as well. Cause for PTC Heater failure is known - "change in temperature" could cause this item to fail per Tesla. i.e. when cold air blows over the heating element. Not sure if enough has been done to fix this from occurring for such a critical component with some hardware or hardware recall for several vehicles on the road. Else these cars must be considered for sales only for few states in the USA which have a stable operating temperature ranges for their PTC heaters to not run into the risk of failure due to big change in temperature.