2021 Nissan Altima Problems

Parts named most: Automatic emergency braking (18), Warnings (9).

What to check before you buy

• Where it is safe, try the adaptive cruise and lane keeping on the test drive and watch for sudden braking or warnings with nothing there.
• Check the windshield in front of the camera and the bumper sensors for cracks, chips or poor repairs.
• Ask whether the windshield has been replaced. The camera has to be recalibrated afterward, and many shops skip it.

Tools that help

What owners said

RE: Formal Demand for Vehicle Repurchase/ Buyback due to Critical Safety Defect- Vehicle Breaking on Its Own While Driving I am writing to file a formal safety complaint and to demand immediate corporate intervention regarding an extremely dangerous mechanical/ADAS defect in my vehicle that Nissan has failed to repair since I purchased…Owner complaint, filed 2025

The Automatic Emergency Braking (AEB) system in my 2021 Nissan Altima SR frequently malfunctions. The forward radar sensor, located behind the front grille, becomes easily obstructed by normal road dirt or weather conditions. When this happens, the system falsely detects obstacles and engages braking or gives collision warnings even when…Owner complaint, filed 2025

What to check before you buy

• Test every switch: windows, locks, mirrors, seat heaters, the screen, the backup camera, Bluetooth and every USB port.
• Watch the dash at startup. Every warning light should come on briefly and then go out.
• Have the battery and charging system tested. A weak alternator or battery drain shows up here.

Tools that help

What owners said

Got the car from kingdom Chevy on 66 and western on February 2024 used at 62.000. I took the car back twice because the screen in the car kept cutting off fading on and fading off. Secondly, the Bluetooth plug would not work. I did not have the car a month. They kept telling me that nothing was wrong with the vehicle. I took my vehicle…Owner complaint, filed 2026

Door lock actuators have failed completely on 2 doors, and intermittently on 1 door of a 2021 Nissan Altima. They do not respond to either the key fob or door button. There are no warnings or indicators associated with this component so it is unknown when the failures first occurred, but it was first noticed in summer of 2025. The…Owner complaint, filed 2026

What to check before you buy

• The pedal should feel firm and the car should stop straight without pulling, grinding or a pulsing pedal.
• The ABS and stability control lights should go out after startup and stay out.
• Look through the wheels at the rotors. A deep lip on the edge means brakes are due soon, which is a fair thing to negotiate on.

Tools that help

What owners said

The contact owns a 2021 Nissan Altima. The contact stated that while pulling out of a parking lot, the contact shifted into drive(D) and then to reverse(R) to exit the parking lot, and while driving 3 MPH, the brake pedal was depressed, and the vehicle failed to stop as intended. The contact attempted to forcefully depress the brake…Owner complaint, filed 2026, at 97,350 miles

The contact rented a 2021 Nissan Altima. The contact stated while driving 45 MPH, the brake pedal was depressed, and the vehicle failed to respond. There were no warning lights illuminated. The contact stated that it felt like the brakes were inoperable. The vehicle was then taken back to the rental car agency. The vehicle was not…Owner complaint, filed 2025, at 44,794 miles

What to check before you buy

• Ask the seller not to warm the car up, and start it cold. Listen for ticking, knocking or a rough idle in the first minute.
• Pull the oil dipstick and the oil cap. Low oil, a gasoline smell or a milky film on the cap are reasons to walk away or get an inspection.
• Plug in an OBD2 scanner. Stored or pending codes matter, and so do readiness monitors that show "not ready", which usually means the codes were cleared right before the sale.
• Ask for oil change records. A gap in the records on a model known for engine complaints is a negotiating point at minimum.

Tools that help

What owners said

Dealership found metal contamination in oil pan from engine. They diagnosed as car needing a new engine due to engine failure. The car only has 90,000 miles and it’s a 2021.Owner complaint, filed 2026

The contact owns a 2021 Nissan Altima. The contact stated that after stopping at a traffic light, the accelerator pedal was depressed, and the vehicle went into LIMP Mode. The check engine warning light was illuminated. The vehicle was taken to a local independent mechanic, where it was determined that there was debris in the engine oil…Owner complaint, filed 2026, at 118,000 miles

What to check before you buy

• Turn the wheel lock to lock while parked and listen for groaning, clicking or binding.
• On a straight road the car should track straight with the wheel centered and no loose feeling.
• A power steering warning on the dash, even briefly, deserves a mechanic’s look before you buy.

Tools that help

What owners said

When I make a turn, I hear a clicking noise and also when I come to a complete stop, I can a sound that sounds like a grunting noise. I had new brakes, rotors and brand new tires put on in 2025. I think my ball joints and tie rod is defective. I have a triple AAA membership and I just renewed it in June and it said that my 2021 has two…Owner complaint, filed 2026

My car has a detached tie rod ball joint and is causing a loss of steering control, and increasing the risk of a crash. My children are in danger yet your site says my vin has no safety recall after I reviewed the safety recall for my vehicle and noticed a connection. I can’t afford any repairs and I shouldn’t have to risk my life over a…Owner complaint, filed 2023

What to check before you buy

• Drive over a few bumps and potholes slowly with the radio off and listen for clunks or rattles.
• Check the tires for uneven wear on the inside or outside edges, a sign of alignment or suspension trouble.
• Look behind the wheels for oily, wet shocks or struts.

Tools that help

What owners said

The contact owns a 2021 Nissan Altima. The contact stated that while driving at an undisclosed speed, there was an abnormally loud clicking sound coming from the vehicle. No warning light was illuminated. The vehicle was taken to the independent mechanic, where it was diagnosed with fractured front driver's and passenger's side axles.…Owner complaint, filed 2025, at 34,500 miles

When I make a turn, I hear a clicking noise and also when I come to a complete stop, I can a sound that sounds like a grunting noise. I had new brakes, rotors and brand new tires put on in 2025. I think my ball joints and tie rod is defective. I have a triple AAA membership and I just renewed it in June and it said that my 2021 has two…Owner complaint, filed 2026

What to check before you buy

• Pull out and latch every seat belt, and let each one retract on its own.
• Try every seat adjuster, and watch for a passenger air bag "off" light when an adult is in the seat.

Tools that help

What owners said

The contact owns a 2021 Nissan Altima. The contact stated that while driving on four occasions, the front driver's side seat belt unintendedly unbuckled. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 141,000.Owner complaint, filed 2026, at 141,000 miles

The drive seat warmer heats up even when the warmer button is off. Also the driver seat seems to be not bolted down correctly you can feel the seat trying to come up when turning and brakingOwner complaint, filed 2023

What to check before you buy

• Drive it from cold if you can. Shifts should be smooth in every gear, including reverse.
• Feel for slipping (revs rise without the car speeding up), shudder at low speed and a delay when you put it in gear.
• Listen for whining, which is a common CVT complaint, and clunks when you go from drive to reverse.
• If it has 4WD or AWD, engage it on the test drive and ask when the transmission and differential fluids were last changed.

Tools that help

What owners said

I am writing to formally lodge a complaint regarding a recurring transmission issue with my 2021 Nissan Altima. The car has been experiencing significant power loss while driving, which I am certain is linked to a malfunctioning CVT transmission system. Despite ensuring that the transmission fluid levels are correct, the problem…Owner complaint, filed 2024

Often while driving the car loses power as if the power went off or I ran out of gas,,, studder for a moment then pick up power to continue to drive is the best way I can describe it. Immediately after I get a notification on the dashboard saying maintenance somethingOwner complaint, filed 2026

What to check before you buy

• Look underneath with a flashlight. Utah road salt is hard on frames, brake lines and the bottoms of doors.
• Open and close every door, the hood and the liftgate, and lock and unlock each one.
• Use a paint thickness gauge and compare panels. A panel that reads very differently from the rest has likely been repaired.

Tools that help

What owners said

Rear door locks both do not work other than manually locking. Reported incidents online show many others have had newer Nissan vehicles like our 2021 Nissan Altima with the same issue, some have been locked in the car and had to climb out the window and others said the door unlocked and opened while driving. This is a big concern for me…Owner complaint, filed 2026

The contact rented a 2021 Nissan Altima. The contact stated that the driver's side door was locked and failed to open with the door handle or the key fob. The contact was able to exit the vehicle through the passenger’s side window. The contact was also unable to open the door from the outside. The contact had to use the key to unlock…Owner complaint, filed 2022, at 2,000 miles

What to check before you buy

• The air bag (SRS) light should come on at startup and go out within a few seconds. If it stays on, the system may not work in a crash.
• Air bag recalls are some of the most serious. Check this exact VIN for open recalls and get proof any recall work was done.

Tools that help

What owners said

I purchased this car in April 2023 and in December 2023. I had to get a new battery when I purchased a car. They told me that there was no worries or mishaps with the vehicle they said just only normal wear and tear for is a used vehicle. My car is a 2021 Nissan Altima so the car would’ve been about two years old maybe or on his way to…Owner complaint, filed 2026

On 10/26/23 at 5:00 pm I was involved in an accident I was hit on the front passenger side and none of the airbags deployed I do remember that right on impact immediately my chest started hurting I also hit my head on the driver side window now i dont know how fast i should be going or how hard do i need to be hit for the airbags to…Owner complaint, filed 2024

What to check before you buy

• Check every light: headlights on low and high, fog lights, brake lights, turn signals and reverse lights.
• Run the wipers on every speed with washer fluid, and run the defroster front and back.

Tools that help

What owners said

Windshield Repair Issue I have a cracked windshield that I attempted to have repaired through my insurance company. The repair company I was sent to was unable to remove the windshield, so they referred me to Nissan, as they are the manufacturer of my vehicle. However, when I went to Nissan, I was informed that they could not remove the…Owner complaint, filed 2025

The contact owns a 2021 Nissan Altima. The contact stated that while driving at an undisclosed speed, a rock hit the front windshield, causing the windshield to crack. The contact scheduled an appointment with an auto glass company to have the front windshield replaced. The vehicle was not diagnosed nor repaired by an independent…Owner complaint, filed 2022, at 41,000 miles

What to check before you buy

• Read the four-digit DOT date on each tire. Tires older than about six years should be replaced, whatever the tread looks like.
• Check tread depth on all four. On AWD vehicles all four tires should match.
• The tire pressure light should go out after startup.

Tools that help

What owners said

The contact owns a 2021 Nissan Altima equipped with Continental Tires, Tire Line: ProContact, Tire Size: 215/55/R17, DOT Number: VY3RWCN5(3621). The contact stated that while driving approximately 55 MPH, the TPMS showed that the tire pressures were low. After stopping the vehicle, the contact discovered a blowout of the driver’s side…Owner complaint, filed 2022, at 6,000 miles