2021 Tesla Model 3 Reliability Score & Common Problems

Owners of the 2021 Tesla Model 3 frequently report issues related to the Full Self-Driving (FSD) software, with symptoms including unintended braking, incorrect lane navigation, and abrupt stops at bus turnoffs. Several complaints describe incidents where FSD malfunctions led to near-crashes or loss of control, with four reports involving actual crashes and four injuries. Additional complaints highlight problems with the HVAC system failing at around 7,500 miles and again at 84,000 miles, and touchscreen reboots rendering safety systems temporarily inoperable. Safety concerns are significant, as multiple reports suggest that these issues can lead to hazardous driving conditions, particularly when FSD is engaged. Used car buyers should be aware of these potential software and system reliability issues when considering this model.

Owners of the 2021 Tesla Model 3 frequently report issues with the electrical system, particularly involving unexpected reboots of the central screen, which can lead to loss of control over critical vehicle functions such as signaling and HVAC. Many complaints highlight problems following software updates, including failures in autopilot, cameras, and other safety features, often necessitating costly repairs. These issues often occur at various mileage ranges, with some reports mentioning occurrences as early as 49,000 miles. Safety implications are significant, with reports of crashes, a fire, and injuries linked to these electrical failures. Potential buyers should be aware of these patterns, especially the potential for sudden loss of vehicle control and the associated repair costs.

Owners report several issues related to the steering of the 2021 Tesla Model 3, with frequent mentions of sudden loss of steering control and steering wheel lock-ups. Complaints often describe the vehicle unexpectedly steering into another lane or losing power steering while driving, sometimes accompanied by electronic anomalies. These issues frequently occur without warning and are sometimes linked to recent vehicle repairs or software updates. Multiple incidents have resulted in crashes, with reports of injuries and one involving a fire. Mileage at the time of failure varies, with some issues occurring as early as 12,000 miles. Potential buyers should be aware of these safety implications, especially the risk of loss of control.

Owners report several issues with the 2021 Tesla Model 3 power train. A recurring problem involves the high-voltage battery pack failing to charge, sometimes accompanied by error code bms_a079, with failures noted at mileages ranging from 15,100 to 57,222. Sudden unintended acceleration is also mentioned, leading to two crashes without prior warning signs. Additionally, multiple owners describe the vehicle unexpectedly losing power or shutting down while driving, sometimes with a warning to pull over but not always allowing sufficient time to do so safely. These incidents occur across various mileages, with some reports indicating issues as early as 27,000 miles. Safety implications are significant, with reports of crashes, sudden stops, and near-miss situations on highways.

Owners report several suspension-related issues with the 2021 Tesla Model 3, primarily involving problems with control arms and bolts. Complaints frequently mention missing or loose nuts and bolts in the rear suspension, with some noting that bolts had nearly slid out unnoticed, which could lead to dangerous situations. Symptoms described include knocking sounds, uneven tire wear, bumpier rides, and in one case, a sheared tie rod resulting in a crash. The issues are often reported around 20,000 to 50,000 miles, with some owners indicating that these problems were not preceded by any noise, vibration, or handling warnings. Safety implications are significant, as one owner experienced a crash due to a sudden loss of steering control, and another reported a wheel detachment, both of which could pose severe risks if they occur at higher speeds or on busy roads.

Owners report issues with the lane departure and Autopilot systems in the 2021 Tesla Model 3, with complaints frequently mentioning improper activation and lack of response during critical moments. Typical symptoms include the lane departure warning activating incorrectly during turns at low speeds, and unexpected steering actions when using Full Self-Driving (FSD) features, sometimes leading to crashes. Three complaints involve crashes, with one describing a failure to disengage FSD, resulting in a collision with median posts. Another crash report involves a lack of warning or automatic steering when a vehicle drifted into the owner's lane. Additionally, some owners note that condensation on camera covers disrupts driver assistance systems, affecting safety features like lane departure and blind-spot detection. These issues are reported early in vehicle ownership, with one crash occurring just 11 days after purchase.

Owners report recurring issues with the airbag system in the 2021 Tesla Model 3, particularly concerning the front passenger safety restraint system. Complaints frequently mention a fault alert related to the passenger seat's occupancy sensor, which intermittently turns off the passenger airbag even when occupied. This issue is often accompanied by distracting warning signals while driving. Additionally, two reports involve crashes where airbags failed to deploy, raising concerns about the system's reliability in collision scenarios. The problem seems to occur in vehicles with varying mileages, with repair costs estimated between $500 and $2,000. These patterns suggest potential safety implications for prospective buyers.