Lexus RX check engine light comes on

Filed Aug 3, 2026 · Transmission · AR

While on a long road trip on a hot day, on the interstate, the car suddenly lost speed and would not accelerate. It was like the car had shifted into neutral. I was coasting on the interstate, steadily slowing, and was forced to pull over to the shoulder. I turned the car off and waited a couple of minutes then turned the car back on. No error messages were displaying at that time. About 5-10 minutes later, I pulled over for a planned stop. My husband assumed driving responsibilities when we got back into the car. Upon trying to get back on the interstate, the car would not accelerate, and multiple errors error messages appeared, including: ""System Malfunction/Visit Your Dealer," "Check Engine/Visit Your Dealer," "Drive-Start Control Malfunction/Visit Your Dealer," "Secondary Collision Brake System Malfunction/Visit Your Dealer," and "Traction Control Turned Off." He pulled into a nearby parking lot where we had to have the car towed to the dealership. It felt like the car was in neutral when this happened both times.

Filed May 29, 2026 · Engine, Transmission · NJ

My 2023 Lexus RX350 with 67,000 miles displayed a check engine light along with a Drive-Start Control Malfunction warning. The vehicle was brought to a Lexus dealership where it was diagnosed with fault code P25B372 — Turbocharger Wastegate A Actuator Stuck Open. The dealership confirmed the wastegate actuator has failed and requires replacement. The part is currently on backorder with over 800 units backordered nationally, indicating this is a systemic issue affecting multiple vehicles. Toyota has issued Technical Service Bulletin T-SB-0084-23 covering this exact fault code on the same 2.4L turbocharged engine used in the 2023 Lexus RX350. The bulletin states the repair is covered under the Federal Emission Warranty for 96 months or 80,000 miles. However, the Lexus dealership has declined warranty coverage citing the absence of a Lexus-specific bulletin, despite the identical engine and fault code. The failure puts safety at risk as the Drive-Start Control Malfunction warning indicates loss of traction and stability control systems. The problem has been confirmed by the Lexus dealership. Warning lamps appeared on the dashboard prior to the visit. The vehicle is available for inspection upon request.

Filed Mar 29, 2026 · Driver assistance, Engine · CA

1. Check engine light comes on. 2. Intelligent collision system (ICS) plashing while driving

Filed Mar 12, 2026 · Electrical, Engine · CA

I own a 2020 Lexus RX 450h with approximately 129,803 miles. The check engine light came on and the vehicle stored diagnostic trouble code P0A2D, which indicates a failure of the drive motor/temperature sensor circuit that is integrated into the transmission/hybrid motor assembly. According to the Lexus dealer’s diagnosis, the temperature control sensor located on the transmission/hybrid drive unit has failed. Because Lexus designed this sensor as part of the transmission assembly, the dealer has stated the sensor cannot be replaced separately and that the only repair is to replace the entire transmission. Lexus is refusing to acknowledge this as a manufacturing defect and is requiring me, the consumer, to pay the full cost of a complete transmission replacement, estimated at approximately $9,040.03, solely due to the failure of this internal temperature sensor. This is a critical component used to monitor drive motor/transmission temperature. A malfunctioning sensor of this type can lead to improper system operation, possible overheating, loss of power, or unpredictable behavior of the hybrid drive system while the vehicle is in motion, which presents a safety risk to occupants and other road users. This failure occurred during normal use on public roads and not due to any accident, abuse, or modification. I am requesting that the federal safety agency investigate whether there is a design or manufacturing defect in the drive motor/transmission temperature sensor and its housing or circuitry on the 2020 Lexus RX 450h (and related Toyota/Lexus hybrid models) that forces owners to replace the entire transmission when this internal sensor fails. This appears to be an unreasonable safety‑related defect and an unreasonable repair burden on consumers.

Filed Feb 6, 2026 · Brakes, Engine · 190,000 miles · TX

The contact owns a 2009 Lexus RX 350. The contact stated that while driving approximately 70 MPH, there was an abnormal sound coming from the engine compartment with the check engine oil warning light illuminated. The failure had occurred on several occasions. The vehicle was taken to an independent mechanic, where it was diagnosed, and it was determined that the oil cooler hose was leaking due to a hole. The vehicle was not repaired. The vehicle was taken to a different independent mechanic, where it was diagnosed and determined that the oil cooler hose was leaking due to a hole. The vehicle was not repaired. A dealer was contacted and informed that there was no recall associated with the failure. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline to report the failure. The manufacturer made the contact aware of the Limited Service Campaign Number: LSC9LH. The failure mileage was approximately 190,000.

Filed Feb 3, 2026 · IL

The 12.3-inch display of the instrument panel is blank at startup. Operating the vehicle with this display blank reduces the ability to see certain malfunction indicators. If malfunctions occur while driving, continuing to drive could lead to an increased risk of a crash or an increased risk of injury in the event of a crash.

Filed Sep 3, 2025 · Engine · IL

When we purchased this car in June 2024 it did not have an engine revving issue. The engine, electrical or transmission maybe all of them have SERIOUS SAFETY ISSUES! When driving and you let off the gas pedal the engine starts revving very loudly, it scares the heck out of you because you don't know if you can stop! I have a serious mechanical background, there is always the possibility of the transmission not disengaging and forcing the car NOT to stop! This issue is VERY DANGEROUS AND SCARY! We get very nervous driving a car we paid almost 70K for! Yes reported to the dealer Mungenast Lexus of St. Louis, yes they have duplicated the issues. After keeping our car now on two different occasions for weeks at a time they went to Lexus engineers who are now trying to say its normal! if so, why didn't it start doing the revving until there were thousands of miles on the car! THIS IS A COVER UP! Not been inspected by the manufacturer yet, they only spoke with them. No reason for police or insurance yet. No, there has never been a check engine light appear. The only other thing the car did, after the first time of it revving like this it died when we were pulling out in traffic, it didn't die it actually shut off! This has only happened the one time, it shutting off, can it do it again you bet! These cars are dangerous, I hope nobody has to die to prove this!

Filed Mar 16, 2025 · Locks · CA

1) Electrical malfunction with warning of locking malfunction transiently appearing 2) Locked inside the car and the manual door release would not work after the above. 3) Finally got out after using key fob and multiple attempts to use the door handle, closed the door, and the car locked and could not open it with either the key fob, Lexus application, nor with the emergency physical key (it would turn but not unlock the door). 4) After 1st malfunction, had a smell of burned electrical component but NO smoke or fire. The hybrid system was fully charged however, it is probable that after speaking to Lexus while inside the car with the ignition on to trouble shoot a charging scheduling issue, the 12 volt battery was partially discharged. The car has 441 miles and after Lexus service arrived, they were able to get it drivable HOWEVER, check engine light remained on and "system malfunction...visit your dealer" was also on the entire 7 mile trip to the dealer with the tow truck following me all the way. I kept the window open despite the rain so that I could get out if something else happened.

Filed Nov 26, 2024 · Electrical, Engine · FL

For some unknown reason the car will suddenly display multiple warning lights, check engine, service needed, traction control off/inactive then the car will go into reduced engine power mode which prevents acceleration and causes the car to feel like it’s going to stall or shut off. This has happened several times on major high speed highways causing other cars to slam on their breaks, drive recklessly to avoid my failing car. My daughter has been in the car several times when this happened and it took everything in my power to not collide with another vehicle. We have taken the car to the Lexus dealership every time and they have tried to fix the car over a dozen times but it keeps happening. They don’t seem to know the issue or cause, trying several different solutions. How can a car manufacturer not know what is wrong with their own car not how to fix it? What am I supposed to do, just keep driving it and pray an accident never happens? There is no warning when this happens and no way to keep the car from swiftly decelerating or keep the car from using “minimal engine power” which I’m to,d is to protect the engine but I’m more worried about us. The date below is for the most recent incident.

Filed Oct 17, 2024 · Engine · VA

Engine cut out suddenly while driving 45 MPH, followed by Battery Light, Check Engine Light, and Power Steering Light forcing hazardous emergency stop. Engine would no longer crank, and car had to be towed to nearest Lexus Certified Repair Facility. Technician scanned the system and found four Codes: P0335, P1603, P1604, P1605. After bore-scoping front three cylinders, technician tried to turn motor by hand and was unable to. The motor turned in reverse, but not forward. Technician removed oil pan to find pieces of valve spring broken and pieces of the piston rings and piston fragments from one of the rear three cylinders. Motor will need to be replaced or completely rebuilt after only 133,458 miles and regular servicing.