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ProblemsByVin Index / 2015-INFINITI-Q40 / COMPLAINTS
Full complaint record · NHTSA

2015 INFINITI Q40 owner complaints

8 complaints filed with NHTSA on this vehicle , including 2 reporting a crash, fire, injury, or fatality. Listed by category, newest first within each section.

other 3 complaints shown

12/29/2015 3,000 mi 1 injury ODI #10816881.0

I bought this new 2015 Infiniti q40 AWD from Infiniti dealer on feb 28, 2015. After driving this noisy car for three months(3000miles), I started having ringing in both ears (tinnitus). I have trouble to sleep and start losing my hearing in both ears. I have contacted the Infiniti dealer in june 2015, the first time I noticed the tinnitus caused by the low frequency noise( range from 100-400hz according to the analysis from adobe audition cc software). The noise became noticeable when reach 35 MPH on both local and highway road. They refused to take the car back to investigate the problem and claimed that it's normal car noise. I took my doctor's suggestion to wear earplugs when driving this q40 since then. After another 6 months of driving (total mileage is 11,000miles now), the tinnitus

07/29/2019 52,000 mi Crash ODI #11240262.0

While in motion on a highway the vdc (auto hydroplane correct function) is suspected to have caused increase loss of control of vehicle. I was able to observe that the vdc light was flickering on and off. It did initially come on to auto correct but then abruptly the vehicle started to hydroplane, despite the function being on and caused me to have to divert into a guardrail...

05/20/2020 25,000 mi ODI #11325245.0

The car when parked on a steep slope with the emergency brake/parking brake on will start to roll on its own. Infiniti was contacted and blamed my driveway as the problem but I have 6 cars and the Infiniti is the only car that cant stay parked and rolls when parked. Was told id have to pay 3 thousand dollars if I wanted my car to get checked. *tr

airbags 3 complaints shown

3 total in this category · moderate · avg repair $1,100 · see airbags cluster analysis →
09/27/2019 60,000 mi ODI #11258627.0

Since I bought car the passenger "air bag off" light is always on whenever my wife, who weighs 165 lbs, is a passenger - she does not have airbag protection. We normally do not have a passenger in the front seat, and never even knew if that was an option until my wife just sat in the passenger seat and pointed it out to me. This is while she was sitting with the seat belt while the car was moving at any speed.

09/06/2015 ODI #10761872.0

Since I bought car at 96 miles and now at 3000 miles the passenger "air bag off" light is always on whenever my wife, who weighs 105 to 109 lbs, is a passenger - she does not have airbag protection. I took car to the service department of two independent dealerships 4 months apart..they both kept it overnight, tested it "thoroughly." their respective service managers said that the air bag met all specifications and that they "cannot adjust since it is set at the factory" I was referred to Infiniti regional office and their representative said the same thing, but he added that given her weight if the air bag did deploy it would "be like a lethal weapon." I just read about the Nissan "bag light recall" in today's paper. I am very uneasy...updated 10/01/15*bf

06/22/2017 18,000 mi ODI #11000712.0

The passenger airbag off light stays on while an adult weights more than 120 pound sitting on the passenger seat. The light won't go off while the car is moving.

body 1 complaint shown

08/21/2024 100,328 mi ODI #11609960.0

The contact owns a 2015 Infiniti Q40. The contact stated while parked, a water leak coming from the driver’s side floor was discovered. The contact also noticed that there was an abnormal odor coming from inside the vehicle that became more pronounced with the A/C unit activated. The vehicle was taken to a dealer; however, a diagnostic test was pending. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 100,328.

electrical 1 complaint shown

04/13/2025 ODI #11654319.0

A common issue found in the Infiniti Q40/G37 lineage, the sunroof drain became clogged leading to an influx of moisture underneath the flooring and within the panels of the right half of the vehicle. Due to the fault, electrical components such as the BCM and ECM were exposed to moisture, leading to numerous issues.

Source: National Highway Traffic Safety Administration (NHTSA) owner complaint database. Last synced 2026-07-26. Complaints are owner-submitted and unverified — the existence of a complaint is not proof of a defect, but a pattern of complaints around the same component is a signal worth weighing. Verify any specific filing at nhtsa.gov.
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