Most common 2018 Infiniti Q50 problems
Share of the 44 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Infiniti Q50 complaints by model year
Best Q50 years: 2021, 2016, 2023. Years to avoid: 2014, 2015. Compare all years →
2018 Infiniti Q50 recalls (3)
Power train › Driveline › Driveshaft
Nissan North America, Inc. (INFINITI) is recalling certain 2011-2013 M56, 2012-2013 M35 Hybrid, 2014-2018 Q50, Q70 Hybrid, 2014-2019 Q70, and 2015-2019 Q70L two-wheel drive vehicles. The driveshaft can fatigue and break.
Remedy: Dealers will replace the driveshaft, free of charge. Owner notification letters were mailed August 13, 2024. Owners may contact INFINITI's customer service at 1-800-662-6200.
Back over prevention › Sensing system › Camera
Nissan North America, Inc. (Nissan) is recalling certain 2018-2019 Nissan Altima, Armada, Frontier, Kicks, Leaf, Maxima, Murano, NV, NV200, Pathfinder, Rogue, Rogue Sport, Sentra, Titan, Titan Diesel, Versa Note and Versa Sedan vehicles, as well as Infiniti Q50, Q60, QX30 and QX80 vehicles.
Remedy: Nissan will notify owners in phases, having dealers update the back-up camera settings software, free of charge. The recall began November 11, 2019 and all affected VINs should be activated.
Electrical system › Software
Nissan North America, Inc. (Nissan) is recalling certain 2016-2018 Infiniti Q50 and 2017 Infiniti Q60 vehicles equipped with a 2.0L engine. Incorrect Fuel Pump Control Module (FPCM) software may allow the fuel level in the main tank to be too low to supply fuel to the engine, causing the engine to stall while driving.
Remedy: Nissan will notify owners, and Infiniti dealers will reprogram the Fuel Pump Control Module (FPCM) with corrected software, free of charge. The recall began August 29, 2017.
What 2018 Infiniti Q50 owners say
Engine & cooling
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 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.
Air 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.
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.
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. …
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.
2018 Infiniti Q50 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.5L 6-cyl hybrid | 7-speed automatic | RWD | 27 / 32 / 29 |
| 3.5L 6-cyl hybrid | 7-speed automatic | AWD | 26 / 30 / 28 |
| 2.0L 4-cyl turbo | 7-speed automatic | RWD | 23 / 30 / 25 |
| 2.0L 4-cyl turbo | 7-speed automatic | AWD | 22 / 28 / 24 |
| 3.0L 6-cyl turbo | 7-speed automatic | RWD | 20 / 29 / 23 |
| 3.0L 6-cyl turbo | 7-speed automatic | AWD | 19 / 27 / 22 |
EPA ratings. Class: Compact car.
Frequently asked questions
Is the 2018 Infiniti Q50 a good car?
Based on 44 owner complaints filed with NHTSA, the 2018 Q50 rates average: 33% fewer complaints than a typical year of the Q50 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2018 Infiniti Q50?
The engine & cooling — 18 complaints, 41% of all complaints for this model year. Next are the air bags (9) and fuel & propulsion system (6).
How many recalls does the 2018 Infiniti Q50 have?
There are 3 recalls for the 2018 Infiniti Q50, the most recent from June 21, 2024 (driveshaft). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Infiniti Q50?
The best years by complaints, compared at the same age, are 2021, 2016 and 2023. Years to avoid or approach with caution: 2014 and 2015. See the full Infiniti Q50 years comparison.
At what mileage do 2018 Infiniti Q50 problems happen?
The median mileage reported in complaints is about 26,000 miles; 72% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.