2021 Nissan Sentra Reliability Score & Common Problems

Owners of the 2021 Nissan Sentra frequently report issues with the vehicle's automatic emergency braking system, which activates unexpectedly without any apparent obstacles, sometimes causing abrupt stops that could lead to rear-end collisions. Complaints also describe electrical problems, such as windows failing to operate and intermittent starting issues, with some owners noting these occur regardless of temperature or after the car has been parked. Additionally, a recall-related failure of a front tie rod has resulted in at least one reported crash. These issues are noted across various mileage ranges and are often unresolved after dealership visits, suggesting potential reliability concerns for prospective buyers.

Owners of the 2021 Nissan Sentra report recurring issues with the automatic emergency braking system engaging unexpectedly. Complaints frequently mention that the system activates without any vehicles or obstructions present, leading to sudden deceleration or braking. This issue is reported at various mileages, including as low as 200 miles and as high as 28,000 miles. Several owners express concerns about safety, noting that unexpected braking could pose a risk of rear-end collisions if a vehicle is following closely. These reports indicate that potential buyers should be aware of these braking system malfunctions when considering a used 2021 Nissan Sentra.

Owners report issues with the 2021 Nissan Sentra's power train, particularly related to the transmission. Complaints frequently mention hesitation in acceleration and a loud whining or "jet engine" sound, often accompanied by a "CVT Warning" message. These symptoms are noted at varying mileages, with one case at approximately 36,700 miles and another at 118,000 miles, suggesting potential recurring issues. Safety implications are highlighted by concerns over the vehicle's ability to shift gears properly, with one owner expressing unease about the transmission's reliability despite it being a new car. Prospective buyers should be aware of these transmission-related complaints and the possibility of repeated issues even after replacement.

Owners of the 2021 Nissan Sentra report issues related to the engine, with specific mentions of alternator pulley failures and engine bearings causing power loss. Symptoms frequently include the vehicle entering limp mode and losing power suddenly, which has been noted to nearly cause accidents. Additionally, one owner reports persistent engine problems that were initially dismissed by a dealership, later discovering sludge buildup in the engine. These issues appear to occur without warning, and while specific mileage ranges are not provided, the complaints suggest ongoing problems from early ownership. Safety implications are evident as the sudden power loss could lead to dangerous situations on the road.

Owners of the 2021 Nissan Sentra report issues related to vehicle speed control, including a rattling noise from the belt assembly and a shaky tensioner pulley, with one instance involving metal shavings from a damaged alternator. Another owner describes a potential security breach, suggesting that the vehicle's brakes and RPMs are being manipulated, leading to resistance during acceleration. These complaints highlight potential safety implications, such as unintended acceleration or braking, though no specific mileage range or timeline is consistently noted. Prospective buyers should be aware of these reported issues when considering a used model.

Owners of the 2021 Nissan Sentra report issues related to the suspension, with one complaint specifically mentioning a popping sound when turning the steering wheel, which was attributed to a fractured tie rod. This issue occurred at approximately 23,000 miles and was linked by the owner to a steering recall. No warning lights were indicated in this case. Safety implications include the potential for loss of steering control, though no crashes or injuries were reported. Buyers should be aware of these symptoms and consider checking for any unresolved recalls or repairs related to the steering and suspension components.

Owners of the 2021 Nissan Sentra report issues with the rear door locks and water drainage. Multiple complaints describe rear doors failing to lock or unlock using the key fob or driver's door controls, with one owner noting that the dealership confirmed a failure in the Controller-Lock and Actuator, requiring replacement. Another owner reports hearing water sloshing in the rear of the vehicle and discovering water accumulation in the rear doors, which drained upon removing the door seals. These issues are noted at mileage around 14,000 miles and may pose safety risks, especially concerning restricted access to the rear doors during emergencies.