Table 1 shows one common vehicle speed control related problems of the 2021 Infiniti Q50.
| Problem Category | Number of Problems |
|---|---|
| Vehicle Speed Control problems |
In August 2026, while driving, the vehicle suddenly lost acceleration and engine power and would only travel at a very slow speed. The check engine light came on. The driver had to safely stop, turn the engine off, and restart it. After restarting, the vehicle temporarily regained acceleration and normal speed. This problem has occurred more than once and creates a serious safety risk in traffic, especially when merging or crossing intersections. An Infiniti dealer inspected the vehicle and advised that the problem may involve the turbocharger system, with repairs estimated at approximately $4,000. Infiniti consumer affairs was contacted about the loss of acceleration but declined financial assistance because of the vehicle's mileage/warranty status. The vehicle was previously an enterprise rental vehicle and had prior Infiniti service history. The vehicle is available for inspection. I am requesting investigation of this sudden loss-of-power condition. I am aware that NHTSA recall 21v-234 / Infiniti campaign r20c5 involved certain 2021 Q50 vehicles and an ecm software condition associated with a warning light, reduced power, and possible engine stall while driving. My VIN currently shows 0 unrepaired recalls, but I am requesting verification of whether this campaign ever applied to my vehicle and, if so, when and at what mileage the ecm reprogramming was completed. My vehicle is now experiencing a check engine light and sudden loss of acceleration/power while driving, which temporarily improves after the engine is shut off and restarted. I am also aware of Infiniti TSB itb22-038d/em22-007d concerning turbocharger replacement procedures for 2016–2024 Q50 vehicles equipped with the vr30ddtt engine. I request investigation of whether my present loss-of-power condition is related to the ecm, turbocharger/boost system, or another safety-related defect.
I purchased a new 2021 Infiniti Q50 from Infiniti of cool springs on September 28, 2020. There was an incident on January 13, 2022 due to a manufacturer defect that caused my car to accelerate on it’s own. I was parked at a car wash to vacuum my vehicle. I had my foot on the brake to move the gear shift into park when my car rapidly accelerated which caused me to crash through a metal fence that separated the car wash from the adjacent property. I have an added safety feature on my vehicle to prevent a forward collision with emergency breaking that also didn’t implement. There wasn’t any warnings, indications or symptoms beforehand. I had my Infiniti for 16 months with only 20,766 miles on it at the time of the incident. This malfunction could present a serious public safety issue. I or someone else could have been seriously injured in a different scenario. It was fortunate that I was stopped and no one was in front of the car. Nissan issued a recall on April 3, 2021 for the problem of rapid acceleration. The dealership without my knowledge completed the recall on my vehicle on April 1, 2021 which evidently didn’t fix the problem. Nissan and the dealership have been and are therefore aware of the problem. Infiniti consumer affairs nor the dealership want to assume any responsibility for the malfunction. An inspection has not been performed yet. Infiniti consumer affairs requires me to assume responsibility for the cost of a rental during the 6 - 8 week inspection of my vehicle along with the cost of any storage fees. The vehicle can be inspected at Infiniti of cool springs. It’s been there since the incident.