2021 Tesla Model 3 Problems

What owners report

Complaints on the 2021 Model 3 are dominated by driver-assistance behavior: owners describe the car slowing or braking sharply on its own while adaptive cruise control or Autopilot is engaged, often on open highway with nothing ahead. Many of these reports arrive at low mileage, typically within the first several thousand miles, and a smaller but steady group describes brake, steering, and power-loss symptoms.

1. 1
   Forward collision avoidance

   Phantom braking under cruise control / Autopilot

   • 423 complaints (63%)
   • median 10,000 mi at 1.5 yrs old (21 state mileage)
   • 24 mention a crash, fire or injury
   • owner-quoted repair $2,750 (median of 6 quotes)
   • filed 2020–2026

   Owners describe the vehicle braking hard or dropping speed suddenly while adaptive cruise control or Autopilot is active, with no obstacle visible ahead and no warning on screen. Some say it happens repeatedly at the same spot on their commute, near overpasses, on-ramp merges, or when large vehicles pass in the adjacent lane; others report it in rain. Several say they disengaged the system and drove manually, and complaints describe service visits where the dealer reported no malfunction found in the sensors or system. Usually reported within the first few thousand miles, often on highways at 60-75 mph.

   Recall 21V846000Recall 23V838000

   What to check: Ask whether the vehicle has the latest software installed and whether any prior owner reported braking events to Tesla service. A test drive with cruise control on a multi-lane road is worth doing.

   2 excerpts from owner complaints in NHTSA records

   “When driving on the highway on autopilot (not full self driving or enhanced auto pilot), the vehicle will experience “phantom braking” where it will suddenly brake with full regenerative braking force without any perceivable reason/cause. I have noticed this event occurs every time at the same location as it is on my commute to work. …”

   NHTSA complaint #11514384, filed 2023-03

   “Since purchasing my Tesla new in 6/21, I've been experiencing random and dangerous Phantom Braking where the vehicle will suddenly brake hard on the highway for no reason. On a few occasions, this created a hazard for motorists behind me. This has been occurring in rural and urban settings with the vehicle's cruise control or AutoPilot set. It doesn't matter which system I use, phantom braking is persistent in both. …”

   NHTSA complaint #11449801, filed 2022-02
2. 2
   Vehicle speed control

   Sudden loss of power or unintended acceleration

   • 97 complaints (14%)
   • median 9,500 mi at 1.6 yrs old (14 state mileage)
   • 21 mention a crash, fire or injury
   • filed 2020–2026

   Complaints describe the car cutting motive power without warning, sometimes at speed on a highway, leaving the driver unable to accelerate; in some cases the vehicle would not restart and needed a tow. Others report the opposite — the car surging forward while parking or at low speed even with the brake pedal pressed, in a few cases striking parked cars, a wall, or a building. Several owners say the dealer attributed the shutdown to a failed drive unit or inverter, or in one case to insufficient charge despite remaining battery percentage. Reported from very low mileage up to roughly 80,000 miles, with many under 10,000.

   What to check: Ask for a service history showing any drive unit or inverter replacement, and confirm the battery state of charge behavior on a test drive. Note whether the car responds normally to the accelerator at very low speed.

   2 excerpts from owner complaints in NHTSA records

   “When I was driving on highway the suddenly I lost power and if I press gas pedal it would not go. I applied brake to slow down and pull over but as soon as I applied the brake it corrected on its own and continued to go since I did had similar issue like this previously I called Tesla and asked them to tow it to the shop. This is the 3nd time that I'm having an issues with drivetrain that my car was towed to shop.”

   NHTSA complaint #11429014, filed 2021-08

   “i am slowly coming into the driveway. All of a sudden the car accelrated while i was applying brake. the air bags didn't come on either. it hit the car in front which then got pushed into the garage”

   NHTSA complaint #11507658, filed 2023-02
3. 3
   Brakes

   Brake pedal feels stiff, braking response questioned

   • 27 complaints (4%)
   • median 23,000 mi at 2.3 yrs old (2 state mileage, few)
   • 13 mention a crash, fire or injury
   • filed 2021–2026

   Owners describe the brake pedal becoming stiff or unresponsive when pressed, in some cases at low speed while coming off a ramp or parking, with the car continuing to move. Others report the vehicle accelerating while the brake was applied. Complaints mention collision damage in several of these events and that no warning light appeared beforehand. Spread across the mileage range, from a few thousand miles up to about 33,000, often at low speed.

   Recall 21V3870002 related service bulletins

   What to check: Check the brake pedal feel on a test drive and ask whether the brake caliper bolt recall work was completed. Service bulletins describe inspection and repair for corroded brake lines, so ask about brake fluid condition as well.

   2 excerpts from owner complaints in NHTSA records

   “The contact owns a 2021 Tesla Model 3. The contact stated that while attempting to park at 5 MPH, the brake pedal was depressed however the vehicle accelerated independently. As a result, the contact crashed into the two parked vehicles on the side of the parking space she was attempting to park. No air bags were deployed. One parked vehicle had an occupant and the other was unoccupied. There were no injuries or medical attention required. A police report was filed. …”

   NHTSA complaint #11556190, filed 2023-11, 33,000 miles

   “The contact owns a 2021 Tesla Model 3. The contact stated while driving approximately 25 MPH as he was exiting a highway and slowing for a traffic signal at the bottom of the off-ramp his brakes failed to engage. The contact stated the brake pedal was stiff and he had attempted to use full leg force to depress the brake pedal. The contact's vehicle ran the traffic signal and the contact stated he hit the right front end of a vehicle that was across traffic from him. The contact stated no warning light was illuminated. …”

   NHTSA complaint #11522497, filed 2023-05, 18,000 miles
4. 4
   Steering

   Steering loss or unexpected steering pull

   Mentioned in 4 of 60 sampled complaints

   A small group of owners describe the steering wheel seizing or the car not responding to steering input, including while reversing at low speed and while driving at moderate speed, with one report of the car veering off the road. Another mentions a screen message indicating the front motor was disabled alongside the loss of power steering, which returned later. Complaints also describe front suspension noise traced to a separated lateral link. Reported from about 12,000 to 51,000 miles, at low and moderate speeds.

   Recall 21V835000Recall 23V085000

   What to check: Listen for knocking from the front suspension over bumps and ask whether the front suspension lateral link fastener recall was completed. Confirm power steering assist feels normal at parking speeds.

   2 excerpts from owner complaints in NHTSA records

   “The contact owns a 2021 Tesla Model 3. The contact stated that while driving approximately 40 MPH, the vehicle made a violent right turn inadvertently crashed into a ditch, and rolled on the driveway. The contact sustained a concision. Medical attention was needed. A police report was filed. The vehicle was towed to a lot. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 44,410.”

   NHTSA complaint #11585174, filed 2024-04, 44,410 miles

   “The contact owns a 2021 Tesla Model 3. The contact stated while driving out of a parking space, the steering wheel seized. The message Front Motor Disabled. Continue Driving was displayed. The manufacturer was contacted and provided remote assistance, but the failure persisted. The contact stated that the vehicle regained power steering functionality after an hour. The contact stated that the failure recurred while driving out of a parking space on another occasion. …”

   NHTSA complaint #11545854, filed 2023-09, 17,000 miles

Buying note. Most complaints here center on driver-assistance behavior rather than hardware wear, so confirm the car is on current software and ask the seller what service visits it has had. Have a pre-purchase inspection cover brakes, front suspension fasteners, and the heater operation in cold weather.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.