2023 Lexus IS

I am reporting a severe, unresolved safety hazard involving my 2023 Lexus IS350]. The vehicle is continuously flashing 'Braking System Malfunction,' 'Crash Light,' and 'Engine Light' alerts on the dashboard. This is the second major acceleration and braking system failure since purchasing the vehicle brand new.The authorized dealership, Meade Lexus, has repeatedly failed to properly diagnose or repair this critical braking issue over a 7-month period. On multiple service visits, the dealership documented that they simply 'lubed' the rubber around the gas cap, reset the dashboard warning lights, and returned the vehicle to me without performing actual mechanical repairs to the braking system. The service manager explicitly instructed me that I must drive the vehicle back to the dealership every single week just to have the safety lights turned off manually. Driving a vehicle with an active, un-diagnosed braking and crash-system fault is a major safety liability and makes the vehicle dangerous to operate. The manufacturer and dealer have failed to resolve this safety defect under warranty."

NHTSA ID

11753916

Incident

Sep 1, 2025

I am reporting a recurring front bumper cracking and separation issue on my Lexus IS 500. A crack developed at the front bumper seam directly adjacent to the passenger-side headlight assembly. The crack originates at the bumper mounting/retention area near the headlamp and appears to be stress-related rather than impact-related. There is a known Lexus Technical Service Bulletin addressing front bumper sag and improper retention on this model. Multiple other Lexus IS 500 owners have reported similar cracking and separation in the exact same location, including vehicles that have not been modified or involved in collisions. My concern is that: The crack appears at a structural mounting point of the bumper. Continued stress or separation may compromise bumper retention. Progressive separation could create risk of partial bumper detachment at highway speeds. The issue occurs adjacent to the headlight assembly, raising potential concern for lighting alignment or mounting stability if the condition worsens. This does not appear to be isolated cosmetic damage but rather a recurring stress point at the bumper mounting seam. If the bumper retention system is insufficient or prone to stress cracking, this could pose a potential roadway hazard if separation increases while driving. Given that Lexus has issued a Technical Service Bulletin regarding bumper sag/retention on this model, I am requesting that NHTSA review whether the front bumper attachment design presents a broader safety concern.

NHTSA ID

11717863

Incident

Dec 1, 2025

The contact owns a 2023 Lexus IS350. The contact stated that while driving at an undisclosed speed, the moon roof suddenly shattered, raining glass into the interior of the vehicle. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 11,000.

NHTSA ID

11570824

Incident

Feb 7, 2024

Mileage

11,000 mi

During driving an issue arose where the acceleration had to be performed in order to avoid a potential accident. The gas pedal vas depressed but the transmission would not downshift or accelerate. After about a second or more the transmission finally downshifted and the vehicle accelerated. I was able to steer out of trouble and fought the in order to do it. This is a know issue and programmed by Lexus. Who in their right mind does not allow the car to accelerate when the gas pedal is depressed. this issue ue seems to be with IS500 only. the mechanic did acknowledge a slow shift and this is by design. I am afraid to pull into traffic since the car will not go. It will start to go then slow down or back off and then after it downshifts it picks up speed. The time is so slow that I could get hit if the approaching traffic gets to me despite knowing that the distance is sufficient to safely pull into traffic. the car is unpredictable. In my other cars I have no issues like this. I have another Lexus vehicle and it does not do this. Many have reported the slow downshift and Lexus mechanic say it is by design. A downshift of one second or more at 60 miles an hour is 88 feet of travel. The car is not safe to drive because the driver is not in control. If you have to accelerate to avoid an accident or get out of the way you will not be able until the stupid car decides to. I have driven other Lexus models and they do not do this. Only IS500 does this. It is so unnatural that you press the gas pedal half way down and nothing. The car has to accelerate when you need to accelerate. Lexus also sells performance but it is not a performance car. Somebody is going to die due to this issue. I am nervous driving the car and I feel like I am out of control. This is a continuous problem. So far I almost got into 3 accidents due to this issue that could have resulted in a serious accidents.

NHTSA ID

11539244

Incident

Mar 3, 2023

OBSOLETE NOTICE February 2, 2026: This bulletin is now obsolete. Please see L-SB-0004-26.

Some 2018 – 2025 model year Lexus vehicles equipped with the Enform™ 2.0 Navigation System, require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.

Some 2005 – 2026 Lexus vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manuals and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines. This Service Bulletin is to provide a general overview and direction for the odor remediation process.

Some customers may experience operational difficulties with some telematics features which they cannot resolve on their own. These resources, in conjunction with the Repair Manual, are for dealership personnel to assist those customers with user issues, user errors, and compatibility issues with other vehicle systems and external applications encountered while operating telematics features.

Some 2016 – 2020 model year GS F, 2008 – 2014 model year IS F, 2022 – 2025 model year IS 500, 2018 – 2025 model year LC 500, 2021 – 2025 model year LC 500c, and 2015 – 2025 model year RC F vehicles with 2UR-GSE engines may exhibit a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs): •P0505 – Idle Control System •P2111 – Throttle Actuator Control System – Stuck Open The throttle body assembly with motor and ventilation hoses no. 2 and no. 3 have been modified to address these conditions.

The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.