2018 Infiniti Q50: Is It Reliable?
Problems, Recalls & Buyer Verdict
Used INFINITI Q50 shoppers should review this model-year complaint and recall record before making an offer. Current data includes 40 complaints, with Engine Problems as the top reported area.
2018 Infiniti Q50 Fuel Economy
✓ EPA Official DataEPA-rated fuel economy across 6 2018 Infiniti Q50 trim configurations. The median figure is shown; range reflects all available trims.
Source: EPA FuelEconomy.gov. Figures reflect EPA lab testing; real-world results vary by driving style, load, and conditions. 6 trims analysed.
2018 Infiniti Q50 Safety Ratings
NHTSA 5-Star Program2 variants tested — showing 2018 Infiniti Q50 4 DR AWDOfficial crash test results from the NHTSA 5-Star Safety Ratings program. Stars reflect government-conducted tests; higher is safer.
Overall
Not Rated9.7% rollover risk
Frontal Crash
Not RatedSide Crash
Not RatedRollover
9.7% probability
Source: NHTSA 5-Star Safety Ratings. Ratings are based on government crash tests and may not reflect all trim levels.
Based on NHTSA complaint data, the 2018 Infiniti Q50 has 40 owner complaints, 1 crash-related complaints, and 3 recall campaigns on record. The most frequently reported component is Engine Problems. NHTSA reliability signal: Notable Issues.
- Make
- Infiniti
- Model
- Q50
- Model year
- 2018
- NHTSA owner complaints
- 40
- Crash-related complaints
- 1
- Safety recall campaigns
- 3
- Top reported component
- Engine Problems
- Reliability signal
- Notable Issues
- EPA MPG combined
- 25
- EPA MPG city / highway
- 23 / 30
- Fuel type
- Premium Gasoline
- NHTSA rollover rating
- 5/5 stars
- Electronic stability control
- Standard
Most Common 2018 Infiniti Q50 Problems
Top owner-reported complaint areas and where they often appear.
Engine Problems
Fuel/Propulsion System
Airbag Malfunctions
Complaint patterns center on Engine Problems, Fuel/Propulsion System, Airbag Malfunctions. Use these as a pre-purchase inspection guide, then verify recall and damage history on the specific VIN.
Should You Buy a Used 2018 Infiniti Q50?
This INFINITI Q50 year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection.
Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs.
May Suit
This year may suit buyers who prioritize complete maintenance records and pass a pre-purchase inspection.
May Want to Avoid
Buyers who want a lower-risk ownership profile may prefer comparing nearby model years before committing.
What to Check Before Buying a Used 2018 Infiniti Q50
Inspection Focus
- Inspect the most frequently reported complaint components on this model year
- Confirm recall repairs were completed and documented
- Check for accident damage, title brands, and mileage inconsistencies on the exact VIN
Before You Close the Deal
- Run a VIN check on the specific vehicle you are considering
- Verify all open recalls are completed at nhtsa.gov/recalls
- Request service records for the most-reported complaint components
- Have a certified mechanic inspect the vehicle before purchase
Shortlist with model-year data. Decide with the exact VIN.
Before buying a used 2018 Infiniti Q50, run a VIN history report to verify accidents, title brands, odometer records, theft checks, and open recalls for the exact vehicle.
What the Complaint Data Suggests
Editorial interpretation of NHTSA public complaint data. Source: nhtsa.gov. Complaints are owner-submitted and do not confirm a defect. Methodology
The INFINITI Q50 has 40 NHTSA complaints and 3 recalls on record. 1 complaints involve crash-related incidents. This data reflects owner-reported issues submitted to the National Highway Traffic Safety Administration.
Recall context: 3 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase.
- 40 total complaints filed with NHTSA
- 3 federal recall campaigns
- 1 crash-related complaints on record
- Review NHTSA complaint history for the most-reported components
- Check recall completion status at nhtsa.gov/recalls
- Verify service records for frequently complained components
All 2018 Infiniti Q50 Complaints by Category
Every owner-reported complaint category filed with NHTSA for the 2018 Infiniti Q50. Use this as a pre-purchase inspection checklist.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Engine Problems | 19 | — | 1 | — | |
| Fuel/Propulsion System | 6 | — | — | — | |
| Airbag Malfunctions | 6 | — | — | — | |
| Electrical Faults | 5 | — | — | — | |
| Uncategorized Issues | 5 | — | — | — | |
| Back Over Prevention | 3 | — | — | — | |
| Transmission / Drivetrain | 3 | — | — | — | |
| Brake System | 3 | 1 | — | — | |
| Wheel Issues | 3 | — | — | — | |
| Unintended Acceleration | 2 | 1 | — | — | |
| Hydraulic | 1 | — | — | — | |
| Steering Defects | 1 | — | — | — | |
| Seat-Related Issues | 1 | — | — | — | |
| Lane Departure | 1 | — | — | — | |
| Electronic Stability Control (Esc) | 1 | — | — | — | |
| Structural Problems | 1 | 1 | — | — | |
| Headlight/Taillight Failures | 1 | — | — | — |
Source: NHTSA Complaints Database. Complaint counts may exceed total complaints because one report can span multiple categories.
Real Owner Complaints
Read what owners actually reported to NHTSA for the 2018 Infiniti Q50. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
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…
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 …
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 …
Leak in the turbo causing oil to burn and create smoke from the exhaust
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 pose…
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 …
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.
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 f…
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…
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
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 t…
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 …
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 lo…
Turbos are starting to work and car is starting to consume anti freeze
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 ca…
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 degree…
The airbag passenger light is illuminated causing air bag system to remain off until resolve. The vehicle was taken in for inspection and dealer confirmed diagnostic results found Occupant sensor malfunctioning. Under warranty, the sensor was covered, but after installation the s…
The Air bag system on a 2018 Infiniti Q50 AWD is malfunctioning. I’d like to get it checked out especially if this could be a tentative recall issue for myself and other owners of the same vehicle. I feel very unsafe for my family and I because the system was never tampered with…
I went to Evo Motors to find a car and found a car filled out an application and had to return to the next day because they were closing There was already talk about a down payment but no credit transaction was happening yet. I didn’t even have an offer on the credit yet so I …
The contact owns a 2018 Infiniti Q50. The contact stated that the back-up camera was flickering while in use. The contact stated that over time, the back-up camera screen had gone blank and failed to operate as needed. Upon investigation, the contact discovered NHTSA Campaign Num…
Source: NHTSA Complaints Database. Real owner reports for the 2018 Infiniti Q50.
2018 Infiniti Q50 Recalls
3 campaignsNHTSA recall campaigns for the 2018 Infiniti Q50. 3 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Recalls are free to fix at authorized dealers, but completion status must be verified on the exact VIN.
2018 Infiniti Q50 Buying FAQ
Buyer-focused answers based on real NHTSA complaint and recall data for this model year.
Is the 2018 Infiniti Q50 reliable?▾
Notable Issues. NHTSA currently shows 40 owner complaints, 1 crash-related complaints, and 3 recall campaigns for this model year. This INFINITI Q50 year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Treat this as a model-year signal, then verify the exact vehicle's condition and history before purchase.
What are the most common problems with the 2018 Infiniti Q50?▾
#1: Engine Problems (19 complaints). #2: Fuel/Propulsion System (6 complaints). #3: Airbag Malfunctions (6 complaints)
At what mileage do problems start on the 2018 Infiniti Q50?▾
Mileage data is not available or insufficient for this model year.
How safe is the 2018 Infiniti Q50?▾
Complaint data is not the same as crash-test scoring, but it does highlight possible risk patterns. For the 2018 Infiniti Q50, NHTSA complaints include 1 crash-related reports and 1 fire reports out of 40 total complaints. For controlled crash-test ratings, check nhtsa.gov/ratings.
Does the 2018 Infiniti Q50 have any recalls?▾
Yes. 3 NHTSA recall campaigns affect the 2018 Infiniti Q50. A major recall area is BACK OVER PREVENTION: SENSING SYSTEM: CAMERA. 3 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Always verify open recalls by VIN because completion status varies by vehicle.
Should I buy a 2018 Infiniti Q50?▾
This INFINITI Q50 year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs. Pay extra attention to Engine Problems during inspection. Before committing, run a VIN history report to verify accidents, title brands, odometer records, and recall completion for the exact car.
Source: NHTSA (National Highway Traffic Safety Administration) complaint and recall databases, aggregated by VinSpector AI.
Wider context: See the full Infiniti Q50 reliability report with year-by-year comparison.
Owner Reliability Rating
Rate the 2018 Infiniti Q50 based on your ownership experience.
Add your rating:
Ratings are based on owner experience and are separate from NHTSA data shown above.
Check the Exact Vehicle History Before You Buy
Model-year complaints and recalls reveal patterns. A VIN report confirms whether the exact car has accident history, title brands, mileage issues, or open recalls.