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EnginePart report

2021 Infiniti QX50 Engine Problems

Complaints
18about this part
Share
44%of 41 total for the year
Median mileage
—not reported
Trend
RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.

NHTSA recorded 18 complaints about the engine of the 2021 Infiniti QX50, 44% of the 41 complaints for this model year. 1 of these say a crash was involved, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I took my vehicle into Roswell Infiniti to repair/replace the engine bearings as instructed on the recall notice and as it has been making noises and I have experienced rough driving. The workers did not repair or replace the bearings. And when I reported rough driving and problems with the engine, they offered to charge me $175 for a diagnostic fee. The engine is still driving rough and making knocking noises.”

NHTSA complaint #11711840, filed 2026-01

“I received the recall notice approximately 2 weeks ago, the notice state “parts are anticipated to be available beginning in Q4 2025” so I did not schedule for an inspection. This morning, 09/16/2025, I was unable to accelerate after being stopped at a traffic light. I was able to get to a parking lot to have my car towed to an Infiniti Dealership/service center for $260 at their recommended tow provider. After calling the service department to inform them of my vehicle arrival, I requested they run diagnostics for the recall I had received regarding my engine. …”

NHTSA complaint #11687724, filed 2025-09

“While driving on the highway and having no visible vehicle in front of me; my car automatically slams on the breaks and the Emergency Braking system light comes up on the dashboard briefly and then disappears. This has occurred multiple times while driving on highway speeds. It is concerning because there has been no evident or visible vehicles in front of my vehicle when my car abruptly slams on the brakes. To me this is a safety concern. I had mentioned this concern to the service advisor at Infiniti, but he said it would cost approximately $200 just to diagnose it. …”

NHTSA complaint #11680672, filed 2025-08

“Without any warning or indicator light on the dash, the vehicle lost power when pulling out of our driveway - we live on a main road and were very lucky not to be hit by upcoming traffic. The car went into limp mode and would not accelerate past 20mph. We have been fighting with Infiniti for the last three weeks as no one can find the problem and they finally said a new engine was needed. There is on 35,000 miles on this car and we had to fight to have this replacement covered under warranty. Now that parts are back ordered and we are not receiving any help. …”

NHTSA complaint #11621911, filed 2024-10

“I proactively brought my Infiniti QX50 to the dealership for inspection due to the recall. The service department found metal in the engine, which they stated is related to a known recall issue. The service department told me that I need an engine replacement, but Infiniti has denied engine replacement despite this finding. According to the recall, metal inside the engine presents a risk of sudden engine failure, including loss of power while driving, which increases the risk of a crash. The recall exists to prevent this exact outcome, yet the manufacturer is refusing the recommended remedy. …”

NHTSA complaint #11714121, filed 2026-01

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2022318%
20211844%
20201855%
20195739%
201718%
2016526%

Other parts of the 2021 Infiniti QX50

Electrical system
8 complaints
Forward collision avoidance
8 complaints
Engine cooling
7 complaints
Brakes
4 complaints
Transmission and drivetrain
4 complaints
Other or unknown
3 complaints
Fuel system
2 complaints
Exterior lighting
1 complaints
Lane departure
1 complaints
Steering
1 complaints
Body and structure
1 complaints
Vehicle speed control
1 complaints

← All problems reported for the 2021 Infiniti QX50

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology