2018 Infiniti Q50 Engine Problems
- Complaints
- 17about this part
- Share
- 39%of 44 total for the year
- Median mileage
- 22,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 17 complaints about the engine of the 2018 Infiniti Q50, 39% of the 44 complaints for this model year. Where a mileage was given, the median is 22,000 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“On 6/13/2020 the drive belt shredded while driving under 30mph, under light acceleration. At first, the battery light illuminated on the instrument cluster, followed the check engine light. White smoke began to come from the engine. Thankfully, I was nearby my house and made it there safely. Furthermore, the engine overheated due to a coolant hose being knocked off by the shredded belt. Additionally, the water pump and A/C compressor failed. The pulley tensioner assembly and belt were replaced under manufacturer's warranty, along with the aforementioned failed components. …”
NHTSA complaint #11351917, filed 2020-08, 8,660 miles“While I was driving my Infiniti on the highway my serpentine belt snapped 4 different times while in motion. All within one year. Including me getting my car back from the dealer and them letting me have it back that way. Also, the tires are horrendous, from day one, they pulled the car left or right on the car. All the settings were correct on the car. I wanted to have the tires replaced, by the manufacturer, and that can be done because no it's to long and everyone took to long to make things happen. Not to mention dunlop is impossible to get a hold of.”
NHTSA complaint #11161699, filed 2018-12, 23,000 miles“The serpentine belt makes consistent noise in all types of weather. Already had the dealer replace it once. Noise came back and the dealer now says it could be the tensioner pulley.”
NHTSA complaint #11267521, filed 2019-10, 22,000 miles“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, filed 2024-06“My coolant reservoir kept on going empty, I took to dealer for service they replaced the radiator fan module and told me my engine was not porous. I was driving and my engine ended up stalling, turned off while I was driving in the freeway at a high speed cause me to almost lose control of my vehicle because everything stopped working. It looks like an inner rod failed possibly because of the coolant going into engine.”
NHTSA complaint #11517540, filed 2023-04Related service bulletins
- 11014069Feb 4, 2025***** Retailer Announcement ***** INFINITI is committed to providing the highest levels of product quality and customer satisfaction. Therefore, INFINITI is conducting a warranty…
- 11014067Feb 4, 2025MIL ON WITH DTC(S) STORED IN THE ECM This bulletin is no longer active. Please discard previous versions of ITB17-050.
- 11014066Feb 4, 2025TURBOCHARGER REPLACEMENT PROCEDURE APPLIED ENGINES: VR30DDTT IF YOU CONFIRM One or both turbochargers require replacement. ACTION 1. Replace the affected turbocharger(s). Refer…
- 11013263Jan 14, 2025ENGINE ROOM SUB-HARNESS IF YOU CONFIRM DTC P06DA-00 for “ENGINE OIL PRESSURE CONTROL” is stored as current (active) with CONSULT-III plus (C-III plus). ACTION Replace the engine…
- 10207847Jan 26, 2022REMOTE ENGINE START NOT WORKING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
- 10136202Mar 26, 2018INTELLIGENT KEY NOT DETECTED / ENGINE WILL NOT START This bulletin has been amended to update the Applied Vehicles. No other changes were made. Please discard previous versions…
Engine: other model years
Other parts of the 2018 Infiniti Q50
9 complaintsElectrical system
6 complaintsFuel system
6 complaintsOther or unknown
6 complaintsBack-over prevention (rear camera)
3 complaintsBrakes
3 complaintsTransmission and drivetrain
3 complaintsWheels
3 complaintsEngine cooling
2 complaintsVehicle speed control
2 complaintsElectronic stability control
1 complaintsExterior lighting
1 complaints
← All problems reported for the 2018 Infiniti Q50
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 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