toyotaman7

My 16 RX has the exact same issue. According to the dealer it is "Normal".

arrowroot

I have this issue too, the RPM needle stutters up and down when the car is idling (with transmission in Drive mode). I brought it in, but they couldn't reproduce it.

I wonder if it's related to the brand of gas, but haven't tested it enough yet with different brands / different octane ratings to know. I always use Top Tier gas.

I also notice that when the engine is cold, turning on the AC makes the RPM jump significantly, by over 500 rpm, and it feels like the car wants to lurch forward when the AC compressor comes on. Not sure if that is related to the issue of the RPM jumping up and down at idle.

GSFRX350

When you switch the AC on there is extra load on the engine, particularly when it's cold so the revs increase to compensate somewhat otherwise the engine may stall. Haven't you had other cars do that?

GSFRX350

Having a cold engine change revs while it's warming up is not unusual, in fact I thought all cars did that. I know mine have done that, never really think about it as it's so common, once warm they purr like a kitten.

arrowroot

I’ve seen it with my other cars but definitely not to this extent. I need to press on the brake pedal quite hard to prevent the car from physically lurching forward when I initially turn the AC on. This is not my first Lexus RX, and the lurching sensation on my other Lexus in the past was definitely not this strong.

1halifax

Mine does not lurch. Just the rpm jumping up and down and only in reverse. It only happens when I back out of my driveway. It seems to be a combination of a long back up and being on a hill. I will try it on another hill to check.

rxtimes2

Had the TSB done yesterday on my 16, and the transmission shifting is significantly better. Highly recommended.

kenny b

I did as well, its much better

diggdyone

I had the revised TSB done on my 2016 and now the wife will keep it in the family (smoother shifts).
Thanks guys for the link. All I had to do was press print and hand it over to the service writer.

her RX350

my RCF

imperio

Could you post a link to the revised TSB please?

Edit: I see it is in Post #1243 above.

615tpc

Looking at the compelling RX350 again. I haven’t been able to track all the messages on this board, so I must ask. Has the hesitation / transmission issue been solved by Lexus for 2019 MY? Thanks in advance.

dansforest

No doubt. I dont want to buy a car that i cant stand again.....so far i have had 2 cars like that one toyota, and one lexus. Hate them both.

gnguyen

I have a 2019 and as others have reported. None of these issues are fixed. I've had my car at the dealer 5 times in the last 5 months and it came back slightly worse each time. My issues are not fixed.

dansforest

Well, have you had any of the TSB s done? That seems to have really made things better. From what I am reading. But it is just happening now........i swear, they need to go back to the 6 speed transmission. So dumb......

GSFRX350

It's not the transmission as such, it's purely the software mapping.