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2021 rx350 multiple malfunctions error

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Old Sep 12, 2023 | 07:55 PM
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Default 2021 rx350 multiple malfunctions error

Started my car this after dinner . The display immediately had these warning messages:


Secondary Collision Brake System Malfunction. Visit Your Dealer.
Check AWD. Visit Your Dealer.
Check engine light symbol is activated.

There are no headlights or signal for the leftside of the car.

Has anyone experienced the same? It is a strange occurrence for a newish car. There are no rmp or acceleration issues car was always driving great. This is the first issue since purchasing.
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Old Sep 13, 2023 | 02:25 AM
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First thing to check is the battery. A weak battery will cause multiple electronics problems even though it may still start the car.
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Old Sep 13, 2023 | 07:14 PM
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if its a new car bring it to the dealership since its under warranty
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Old Sep 13, 2023 | 08:05 PM
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Bring it back to the dealership STAT and get a full diagnosis, codes read and ECU debug under warranty. Get some free espresso and a nice loaner to drive around in, also.
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Old Sep 14, 2023 | 10:26 PM
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any update??
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Old Oct 31, 2023 | 07:11 AM
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Default 2021 Lexus RX350 Alert Notification

Hello All,
I was driving my Lexus this past weekend and about a 1/2 mile from my house I received several alerts all at the same time.

ALL- WHEEL DRIVE SYSTEM
CHECK ENGINE
ADVANCED ULTRASONIC DET....
SECONDARY COLLISION BRAKE

I pulled over and parked and turned the car off and allowed the car to reset and turned back on and no alerts have come back up. I deleted my alert history and the car has been driving normal with no issues and no new alerts. Should I just chalk this up as a software glitch and forget about it? call my dealer? I am thinking if it does come up again I would definitely take it to the dealer but being that everything has been fine just let it go. Let me know your thoughts as I am thinking this is one of those ghost issues that has cleared itself. The same as many other cars that I have owned.



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Old Oct 31, 2023 | 07:35 AM
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As long as it stay off, I wouldn't worry about it. If you take it to the dealer without the lights showing, they won't do anything.
Was it raining when this happened?
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Old Oct 31, 2023 | 08:05 AM
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Yes, was a light drizzle and the roads were wet. I was going up a hill out of my housing plan and the car had a slight hesitation and the lights them came on.
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Old Oct 31, 2023 | 09:33 AM
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Well, could have been some sensor got wet. See if it only happens when it rains.
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Old Apr 19, 2024 | 05:02 AM
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Originally Posted by LexusGTA
Started my car this after dinner . The display immediately had these warning messages:


Secondary Collision Brake System Malfunction. Visit Your Dealer.
Check AWD. Visit Your Dealer.
Check engine light symbol is activated.

There are no headlights or signal for the leftside of the car.

Has anyone experienced the same? It is a strange occurrence for a newish car. There are no rmp or acceleration issues car was always driving great. This is the first issue since purchasing.
I'm getting the same thing on my 21 rx350 fsport. There was an attempted theft on my car last night, thieves tried the headlamp hack. Taking my car into the dealership to get everything reconnected and hopefully the bodywork can be fitted back together. Second time this has happened to me in a year. Getting sick of this car, too much headache because of thefts.
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