2018 Infiniti Q50

44 complaints on file, page 1 of 3.

1. Filed Sep 22, 2026Failure Aug 24, 2026Missouri City, TXAir bags

   Systemic defect front passenger seat occupancy sensor failure triggering an illuminated airbag warning light.

   NHTSA complaint 11766217
2. Filed Jul 7, 2026Failure May 7, 202634,000 milesAbbeville, SCAir bags, Seat belts

   The contact owns a 2018 Infiniti Q50. The contact stated while driving at an undisclosed speed, the air bag warning light illuminated. The vehicle was taken to the dealer, where the contact was informed that the front passenger seat and passenger seat belt needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 34,000.

   NHTSA complaint 11748898
3. Filed Jun 8, 2026Failure Jun 8, 202659,200 milesDelray Beach, FLAir bags

   The contact owns a 2018 Infiniti Q50. The contact stated that while driving at an undisclosed speed, the front passenger Occupant Classification System (OCS) sensor became inoperable. The vehicle was taken to the dealer, where it was diagnosed that the front passenger OCS sensor had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 59,200.

   NHTSA complaint 11742781
4. Filed May 5, 2026Failure May 5, 2026Central Islip, NYCamera, Electrical system

   I am submitting this complaint regarding a safety defect in my 2018 Infiniti Q50, which was manufactured prior to May 1, 2018. Despite matching the make, model, and production timeframe associated with an existing Infiniti recall for backup camera failures, my specific vehicle is not included in the recall population. The backup camera in my vehicle intermittently fails to display an image or presents a blank or distorted screen when the vehicle is placed in reverse. This defect significantly impairs rear visibility and increases the risk of a collision, particularly in situations involving pedestrians, children, or obstacles that may not be visible through mirrors alone. The backup camera is a critical safety feature, and its failure directly compromises safe vehicle operation. The exclusion of my vehicle from the recall is concerning, given that it shares the same model year, platform, and manufacturing period as those already identified as defective. This suggests that the defect may be more widespread than currently acknowledged. A malfunctioning backup camera is not a minor inconvenience as it creates a clear and preventable safety hazard. I urge the NHTSA to review this issue and consider expanding the scope of the existing recall to include all affected 2018 Infiniti Q50 vehicles, including those manufactured before May 1, 2018, that are currently excluded. Additionally, I encourage further investigation into the consistency and reliability of the backup camera systems in this model line. This complaint is submitted not only to address my individual vehicle but also to contribute to a broader understanding of a potential safety defect that may affect other drivers. I believe that multiple reports of similar issues will help prompt appropriate action to ensure public safety. Thank you for your attention to this matter.

   NHTSA complaint 11735910
5. Filed Mar 19, 2026Failure Jan 12, 202654,000 milesWest Covina, CASpeedometer/odometer

   Odometer Fraud. The contact purchased a 2018 Infiniti Q50. It was discovered that there were three separate mileage discrepancies. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 50,370; however, at the time of registration, it was discovered that the mileage had been rolled back from 54,000 to 28,630 miles. The mileage before the vehicle was purchased was 47,650.

   NHTSA complaint 11725568
6. Filed Jan 7, 2026Failure Oct 4, 2025San Francisco, CAEngine, Fuel/propulsion system, Power train

   Filing this complaint regarding a safety-related defect involving the turbocharger system on my 2018 INFINITI Q50. The vehicle has approximately 46,000 miles and is 8 years old. INFINITI/Nissan has acknowledged through its own Technical Service Bulletins (TSBs) that turbocharger failure on 2016–2018 Q50 3.0T vehicles is a known defect. Nissan’s documentation identifies issues such as turbo oil seal leaks, reduced engine power, smoke, and potential catastrophic engine failure, and provides an extended warranty of up to 10 years or 120,000 miles due to the safety risks associated with sudden power loss. My vehicle experienced turbocharger failure consistent with these known defects, resulting in loss of engine power, which presents a serious safety hazard, particularly during highway driving, merging, or intersections. Sudden loss of propulsion increases crash risk and endangers vehicle occupants and others on the road. In some cases, turbo failure can occur with little or no warning, further increasing risk. The failure was confirmed by INFINITI/Nissan service departments, and the vehicle remains available for inspection. CarMax insurance approved the engine repair, acknowledging mechanical failure; however, they declined to approve turbocharger repair specifically because INFINITI has issued a known TSB and extended warranty covering turbo failure, deferring responsibility to the manufacturer. Despite the vehicle being within the extended warranty limits, Nissan denied coverage, claiming the vehicle has a “branded title.” This claim is unsupported by VIN reports, the loan originator, and CarMax’s own title search prior to leasing all confirm the title is not branded. Nissan has provided no documentation supporting its assertion. Nissan N.A. reviewed and closed the matter despite the known safety defect and lack of evidence for the title claim. Represents a safety-related defect and improper denial of a manufacturer-recognized safety remedy, warranting NHTSA review.

   NHTSA complaint 11709489
7. Filed Dec 10, 2025Failure Dec 10, 2025Sardis, ALEngine

   Leak in the turbo causing oil to burn and create smoke from the exhaust

   NHTSA complaint 11704146
8. Filed Nov 28, 2025Failure Nov 11, 2025Dacula, GAEngine, Unknown or other

   The serpentine belt on my 2018 Infiniti Q50 Sport became contaminated with oil immediately after dealer turbo replacement at the end of August 2025, causing the belt to slip, shred, and be pulled into the engine. This resulted in sudden loss of essential engine functions and poses a significant safety hazard. This failure was caused by improper repair at the dealership.”

   NHTSA complaint 11701863
9. Filed Oct 15, 2025Failure Aug 1, 202588,000 milesMiddle Island, NYEngine and engine cooling, Service brakes, Hydraulic

   The contact's son owns a 2018 Infiniti Q50. The contact stated that soon after purchasing the vehicle, there was an abnormal screeching sound coming from the brakes while depressing the brake pedal. There was no warning light illuminated. The contact's son took the vehicle to an independent mechanic to have the brake pads and rotors replaced. However, less than one month after the replacement of the pads and rotors, there was an abnormal grinding sound coming from the front passenger’s side brakes. The mechanic was notified of the issue, and the contact was informed that the brake calipers might also need to be replaced. The contact stated that while driving at various speeds, the engine temperature gauge indicated that the engine was hot(H), with white smoke coming from the exhaust pipes. The vehicle was taken back to the independent mechanic, but the mechanic was unable to determine the cause of the failure. The vehicle was taken to another independent mechanic and the contact's son was informed that the head gasket had failed, and an engine replacement was recommended. The dealer was notified of the failure, and the contact was informed that there were no recalls or warranty on the vehicle. The manufacturer was also notified of the failure and provided the same information as the dealer. The vehicle was not repaired. The failure mileage was approximately 88,000.

   NHTSA complaint 11693654
10. Filed Oct 8, 2025Failure Jan 1, 2025Glendale, AZAir bags

    The airbag/srs light is on. I've read on multiple forums that this is a common occurrence with this model and year of Infiniti. It did not come on as a result of any accident/incident.

    NHTSA complaint 11692169
11. Filed Oct 2, 2025Failure Oct 2, 2025Tempe, AZAir bags

    Airbag light turn on, on my dashboard, I checked it with a professional OBD2 scanner and shows a code which indicates a fault in the Occupant Detection System (ODS), which the scanner says it is very common for my vehicle. This puts my passengers at risk due to an airbag system fault. My vehicle has not been in an accident, nor has my passenger seat been messed with. I have spoken to other individuals with the same vehicle, also checked the forums for my specific vehicle and almost all of them have the same issue with the ODS, with no recalls or warranty resolution from the dealership. This is a common issue. It is concerning because there is a pattern of the ODS being faulty by no fault of our own but no resolution or recall.

    NHTSA complaint 11691027
12. Filed Sep 10, 2025Failure Jul 14, 2025Jacksonville, FLAir bags, Engine, Fuel/propulsion system

    Within one month of purchase, the airbag warning light illuminated and has remained on continuously. A separate dealership later confirmed the airbag system is defective and may not deploy in an accident. This is a serious safety defect that was not disclosed to me at the time of sale. Additional Issues: •On July 14, 2025, I dropped the car off for prolonged starting issues. I was told the vehicle had six faulty fuel pumps/injectors. •I have not had possession of the car since July 14. •On August 30, 2025, I received an email from Nissan of Orange Park stating the car was “completed and ready.” When I called the next day, I was told the car was not at Nissan at all, but at Infiniti, with no clear repair status or timeline. Concern: This is a federal safety defect. I request NHTSA’s review and investigation into Infiniti/Nissan’s handling of defective airbag systems in this vehicle and the misleading communication surrounding repairs.

    NHTSA complaint 11686256
13. Filed Aug 19, 2025Failure Aug 10, 2025Phoenix, AZEngine, Fuel/propulsion system, Vehicle speed control

    My car wouldnt start and when it did, it would start shaking and every time I accelerate, The speed wasnt going any faster but only the RPMs were

    NHTSA complaint 11681634
14. Filed May 28, 2025Failure May 23, 2025Itta Bena, MSUnknown or other

    I was driving down the highway leaving the barbershop and my car wouldnt go over more than like 55 mph and I got a flashing green symbol beside my check engine light which had just came on when the AUTO (Stop/Start) light did. once I got home turned it off and turned it back on the for a second the light doesn’t come on but once you drive it maybe a quarter of a mile or less it come back on and the car wont function properly again

    NHTSA complaint 11663542
15. Filed Mar 22, 2025Failure Jan 3, 2025Miami, FLFuel/propulsion system, Power train, Service brakes

    Car has white smoke coming from the exhaust and the oil level keeps decreasing. Car stalls and takes time to accelerate P0106 code pops up from engine. There’s a rattle and whine noise coming from the engine bay. Also the gas was stuck accelerating. Had to switch the car to neutral so it does continue accelerating. After switching to neutral I was able to decrease power to the wheels and had to pull over on the road.

    NHTSA complaint 11649920
16. Filed Jan 27, 2025Failure Jan 23, 2025107,000 milesColorado Springs, COEngine, Engine and engine cooling

    The contact owns a 2018 Infiniti Q50. The contact stated that while driving at an undisclosed speed, the "Low Oil Pressure - STOP", message was displayed, and the contact stopped driving the vehicle. The contact stated that while starting the vehicle, the engine was abnormally loud. The contact stated that the low oil pressure warning light was illuminated. The vehicle was towed to an independent mechanic, who diagnosed a failure with the timing chain. The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 107,000.

    NHTSA complaint 11638873
17. Filed Nov 12, 2024Failure Oct 1, 2024Louisville, KYEngine

    Turbos are starting to work and car is starting to consume anti freeze

    NHTSA complaint 11624689
18. Filed Oct 21, 2024Failure Sep 11, 2024Bristol, CTElectrical system, Unknown or other

    The locks on the car automatically keep locking all day long and drain my battery, I have had to have my car jump started and recently towed to Infiniti dealer and they are stating there have been known issues with this electrical problem with rain getting into the sunroof and deteriorating the lines that short out the other systems. I have a bumper to bumper warranty that I took out with the Infiniti Dealership but they are stating only part of the repairs will be covered by the warranty and not the sunroof part and that will cost me $1,300 to fix. If this is a known problem, how is this not a recall and why do me, the consumer, have to pay out-of- pocket for something that is a known issue with the sunroofs on these Infiniti's? Can someone please contact me regarding this issue asap. It started when my car was at Infiniti's body shop in September getting repaired from a hit and run to my vehicle that required replacement of rear left back panel and rear left back passenger driver door (that had nothing to do with this issue) and when I picked the vehicle up they had to jump start my car. They had my car for a month and nothing prior to this was wrong with my vehicle. I don't know if someone left my sunroof open and it rained or what happened since this repair, but now I am having the issue with the car locks automatically/continuously locking and draining my battery. I read online that there is a button that should be available on the dashboard to shut off the automatic locking system, but the dealer has not mentioned this and is stating I need all this electrical things done to my car that will cost over $3,000 and that the sunroof part is not covered. This is absurd and not trusting what I am hearing from the dealership. Please advise asap. Thank you for your time!

    NHTSA complaint 11621012
19. Filed Jun 4, 2024Failure Jun 1, 2024Vista, CAEngine, Power train, Steering

    I was driving down the highway and my car started to shut down and started to make a knocking sound inside the engine bay, putting at risk other drivers, so i turned on my hazards and pulled to the shoulder of the road,the car wouldn’t turn on so i called a tow truck. Took the car to dealer and stated engine is seized

    NHTSA complaint 11592525
20. Filed Feb 21, 2024Failure Feb 21, 2024Paradise Valley, AZUnknown or other

    I was in my car waiting my for complex security gate to open when I heard a loud noise. I got out of my car to see what it was and turns out my sunroof exploded. For no reason. No rock or item hit my car nor was the car in motion. It was also not from the heat as it was 60 degrees outside. I called my warranty and they refuse to cover it because it is glass. I am reading many others with this same issue. How does a 6 year old car have the sunroof explode??

    NHTSA complaint 11573206