2021 Tesla Model S acceleration problems

Filed Sep 29, 2026 · Acceleration, Driver assistance · WA

Tesla has taken away the ability to set maximum speed when using their Full Self Driving. THIS SHOULD BE ILLEGAL!!!! Now, the car can and will do 85 on a 60mph freeway! Sometimes you can't even tell you're speeding that fast until it's too late. INCREDIBLY DANGEROUS! They used to have that feature and they've taken it away. For the greed of collecting more data... AT THE EXPENSE OF EVERY DRIVER'S SAFETY

Filed Aug 12, 2026 · Acceleration, Brakes · 65,000 miles · FL

The contact owns a 2021 Tesla Model S. The contact stated that while driving at various speeds with the cruise control feature engaged, the brakes independently activated without the brake pedal being depressed. No warning light was illuminated. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 65,000.

Filed Oct 20, 2025 · Acceleration, Driver assistance · IL

On October 17, 2025, while using Full Self-Driving (FSD) mode on my 2021 Tesla Model S Plaid, the car failed to stop at two red lights within a three-hour period. In each case, the car attempted to drive through the intersection even though the signal was solid red. I intervened manually and applied the brakes to prevent a potential collision. There were no prior warnings or alerts, and I have not modified the vehicle. This behavior endangers my safety and the safety of others. I am willing to provide the vehicle and any available data logs for inspection if requested.

Filed Dec 27, 2023 · Acceleration, Driver assistance · CO

Driving on divided highway at night, the car slowed dramatically at each exit from the highway.

Filed Aug 25, 2023 · Acceleration, Driver assistance · CO

Vehicle braked without warning with cruise control engaged. Luckily there were no other vehicles near us when this phantom braking occurred.

Filed Apr 27, 2023 · Acceleration, Brakes · TX

On March 19, 2023, I put my Tesla in drive and it went into reverse . When I tried to brake the speed accelerated. We were unable to stop the vehicle, while driving in reverse the car hit two mailboxes and two ceramic flower pots. It has been over 6 weeks and Tesla will not return my calls or messages. My insurance company looked at the body of the vehicle for a repair estimate. Nothing indicated that there was a problem prior to the incident.

Filed Feb 12, 2023 · Acceleration, Driver assistance · CO

The Traffic-Aware Cruise Control has been braking unexpectedly and for no valid reason. The most recent example was when we were driving along US Hwy 24 between Wilkerson Pass and Fairplay, CO. The car suddenly braked even though there was no hazard. This has been happening regularly on this drive, in both directions, multiple times per drive. When this happens, the road is generally straight, with little, if any, elevation change. This is a safety issue because if this happens when a car is driving closely behind us, the unexpected braking could result in a rear-end collision. I have not reported this to Tesla because I understand this is a widespread issue that many people encounter, so I believe Tesla is fully aware of the issue. This problem seems to have gotten significantly worse after Tesla deactivated RADAR in the vehicle (without my consent). My understanding is that they are now using only cameras to manage Traffic Aware Cruise Control. Regardless of the reason, this issue has been happening with much greater frequency since around December, 2022 or January, 2023.

Filed Dec 2, 2022 · Acceleration · 8,000 miles · CO · crash · fire · 3 injuries

The contact owned a 2021 Tesla Model S. The contact stated while driving approximately 100 MPH, as he took his foot off of the accelerator, with the vehicle brake control set to "aggressive slowdown," as the vehicle slowed the contact looked into the rearview mirror and observed white smoke issuing from the rear of the vehicle. The contact then depressed the brake pedal, and instead of slowing the vehicle accelerated at a dramatic rate and the contact lost control of the vehicle and left the roadway. The contact stated he was not aware of any warning lights being illuminated. The vehicle went into a ditch and continued straight following the ditch. The contact stated that the vehicle had not lost any speed, rather it seemed to be going faster. The vehicle crashed through a fence, drove up a slight berm, and went airborne. The contact's vehicle crashed into the ground, front end first, after flying 130 feet in the air, and began to roll end over end two to three times. The contact and his two passengers were unconscious after impact with the ground, the vehicle had come to a stop and caught on fire. The contact had attempted to exit the vehicle once he regained consciousness, however, he had difficulty since the driver's side door was jammed and his left ankle was dislocated and his right ankle was broken. The contact had managed to crawl out of the vehicle through the driver's side window which had completely shattered. The contact stated that the passenger in the front seat was not seriously injured, although he was transported to a hospital and released that same day. The passenger in the rear was transported and hospitalized with internal bleeding and a broken rib, the contact was not told which rib was broken by the passenger. The vehicle had been engulfed in fire and the contact had rolled into a ditch, a passerby was on the scene and called emergency services. The contact was transported from the scene by a rescue helicopter and flown to a trauma center. At the trauma center, the contact was treated for int

Filed Oct 15, 2022 · Acceleration, Driver assistance · TX

Car repeatedly, randomly slams in brakes while cruise control engaged for no apparent reason. Not speeding, no other cars or blockages around, open highway on a bright, clear day.

Filed Oct 1, 2022 · Acceleration, Driver assistance · WI

The vehicle intermittently brakes for no reason with the cruise control enabled. This is going to cause an accident.