Problems · NHTSA complaints

2018 Lexus NX300H problems

Owners filed 20 complaints about the 2018 Lexus NX300H with NHTSA between May 2018 and Jul 2026. The most-cited component is fuel/propulsion system (7).

Complaints
20
Filed with NHTSA
Crashes
2
Reported by owners
Fires
0
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Fuel/propulsion system7
  2. Engine4
  3. Service brakes4
  4. Electrical system3
  5. Steering2
  6. Carry handle, shell, base1
  7. Fuel system, gasoline1
  8. Vehicle speed control1
  9. Visibility/wiper1
  10. Forward collision avoidance1
  11. Structure1
  12. Other / unknown1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20182
20190
20202
20212
20222
20232
20242
20255
20263

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Fuel/propulsion system

7 reports
“My 2018 Lexus NX300 F Sport, stalled while driving, pulled over to safe location turned off vehicle, restarted and proceeded to drive a little. Warning came up on display " Engine power reduced, go to dealer". I was able to drive the car home since it was only 2 miles away. Looked up issue on internet and noticed a recall for said problem. Said do not drive, car is in "limp" mode. Had my car towed to MacIntosh Imports (they only service Lexus & Toyota) they checked diagnostics and code DTC P125D71 Fuel Control Valve stuck. The defect could lead to engine stalling, increasing the risk of crash. Affected vehicles were equipped with a fuel pump that may fail. My vin is not listed on recall, I feel it should be included since the symptoms match and asking Lexus to check for Customer Support Program coverage to fix in "good faith"”
Owner complaint to NHTSAFiled Apr 14, 2026Fuel/propulsion systemODI 11731194

Engine

4 reports
“The contact owns a 2018 Lexus NX300. The contact stated while driving at approximately 70 MPH, the message "Check Oil" and the Master Warning Light was flashing on the instrument cluster. The contact stated that the vehicle stalled. The contact was able to restart the vehicle; however, the vehicle stalled several times and failed to exceed 40 MPH while driving to the dealer. The contact stated that the dealer diagnosed the vehicle and determined that the fuel pump needed to be replaced. The vehicle was not repaired. Additionally, the contact stated that the fuel pump was replaced in April of 2024. The manufacturer was not informed of the failure. The failure mileage was approximately 232,000.”
Owner complaint to NHTSAFiled Nov 28, 2025Fuel system, gasoline, EngineODI 11701875

Service brakes

4 reports2 crashes
“After 45 minutes in stop-and-go traffic the brake pedal went to the floor four times, the Brake Override System (BOS) failed, throwing the shifter into Park failed, and we hit the car in front of us. No warning sounds typical for this car sounded and no lights appeared on the dash. Thankfully, we were only moving at 5 mph which I didn't think qualified as a "crash" but there was indeed a collision. No one was hurt. Besides my wife and myself there were two backseat passengers who also saw my efforts to stop the car. We had the car towed to Lexus of Santa Monica. Unsurprisingly, Ronald Inton with Toyota Motor North America, Inc. (TMNA) indicated in his letter to us that Lexus inspectors seeing our crumpled front license plate and knowing of the failure of the BOS found nothing wrong with the car, but had not driven it under stop-and-go conditions for 45 minutes as we had. The clear failure of the BOS to prevent the collision or even warn of the impending collision was effectively ignored my Mr. Inton. Our full correspondence with him is attached. Both my wife and I loved driving this car but it is a potentially deadly safety hazard and given that TMNA can't fix…”
Owner complaint to NHTSAFiled Mar 28, 2023Service brakes, Forward collision avoidanceODI 11514299

Electrical system

3 reports
“My cars engine has stopped three times on the highway in a six month span - almost causing accidents. My car has been seen twice by Lexus dealerships and there has yet to be an exact cause of this malfunction and no effort made by Lexus to remedy the situation.”
Owner complaint to NHTSAFiled Dec 23, 2022Electrical system, EngineODI 11498672

Steering

2 reports
“In June 2022, the vehicle exhibited abnormal engine behavior, specifically fluctuating revolutions per minute (RPM), while at a complete stop, creating a risk of engine stall. Newport Beach Lexus dealership opted to replace the fuel injectors and gaskets as a corrective measure. Previous invoices also show that there were concerns related to fuel equipment prior to this incident. Subsequently, in December 2024, while traveling with my child on [XXX] near Barstow, California, the vehicle experienced severe shaking during an ascent, leading to a temporary loss of power while driving. I continued to drive after a brief respite due to the unsafe, remote location in the desert. Upon arrival in Las Vegas, the vehicle was inspected by a Lexus dealership, and they were unable to identify the issue at that time. In January 2025, the vehicle’s check engine light came on and further inspections at Lexus South County revealed that the vehicle was unsafe to operate without replacing the fuel pump. The dealership indicated that the vehicle would not be released unless this repair was completed and the fuel pump was replaced. The National Highway Traffic Safety Administration…”
Owner complaint to NHTSAFiled Jun 10, 2025Steering, Vehicle speed control, Fuel/propulsion systemODI 11666186

Carry handle, shell, base

1 report
“Foam is breaking off of the shell. Reached out to Chicco and issue was not resolved nor replaced. This seems to be a reoccurring problem with this car seat. For it to have an 8 year lifespan, it hardly lasts 2 years before Chicco deems it unsafe and needs replaced on my dime. Highly frustrated about this product.”
Owner complaint to NHTSAFiled Jul 24, 2026Carry handle, shell, baseODI 11752560
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.