autotech13

Symphony,that's my next step since my wife's ES came from there.

DMPesso

This is exactly the problem I have sometimes. Only when the car is cold the throttle feels extremely sensitive and has a tendency to surge. It’s annoying but manageable. Especially with auto start.

PWMDMD

I bought my Lexus there too. Is it really an issue if it only happens when the transmission is cold? I have driven MANY cars where the transmission shifts were harsher when the transmission was cold. My current 2018 Pilot 9-speed included. I'm experiencing a harsh 1-2 shift even after the transmission is warmed up and a harsh downshift when accelerating hard....again when the transmission is at operating temp. I'll tell them at the 5K but honestly it's just not a big deal. I'll likely trade this car in 2-3 years anyway and as long as it's in tip-top trade-in shape what do I care?

Nail34

Talk about a different experience, I was in tor the 20k service this morning. My service advisor found the TSB and said no problem, we'll take of that. Why not do the drone TSB while you're at it and he said you need a part for that one, I'll order it and it will be done when you pick up your car. You loaner is parked out front.
Your dealer sucks, big time.

GSFRX350

That's how it should be.

I had a small rattle in the door, wasn't a big deal but thought they may know of it and how to fix. The service guy suggested his senior tech and I go out for a run to show him the rattle, we drove around for 20 minutes, seemed to have all the time in the world to help. That's the type of experience I expect and have received so far with Lexus, shame some dealers aren't playing the Lexus game.

PCW

Had the TSB 0032-19 loaded today. Initial Impressions are favorable. We'll see how it behaves after a couple of days. To be continued.

PCW

I'm on day 3 of the latest TSB and driving in Normal mode and no hesitation or shifting issues! So far a favorable response.

BensonTT

Anyone get the new TSB in Canada? Thanks guys

s4iscool

Having gone through two ineffective TSBs on this issue (first and most recent), and reading the most recent TSB, Im starting to wonder if the ECM/PCM needs to be replaced on my car. I've always thought it was software related as I've driven many other RXs without the issue. Reprogramming has not worked, but I am convinced that Lexus knows the exact issue as the description they use is spot on. There are some days and some roads where the issues are less pronounced, but I still deal with the hesitation, bucking, and surging on a daily basis. It's refreshing to drive my 20 year old Toyota truck that has great throttle response and a smooth predictable transmission.

DMPesso

I know tell me about it. I miss the smooth powertrain on my 2001 GS430. Nothing beats the quality of the old Lexus’. It’s most definitely the programming since sport mode eliminates most issues. The TSB helped the hesitation by about 80%. Using 93 gas also helps a lot. Have you tried that? What year and model is your RX?

PCW

I'm now on day 7 of the latest TSB and all is good thus far.

Nail34

Re TSB 0032-19, here's my theory. We know that the bucking, and I use this word because it is in the title of the TSB, is more pronounced in eco and drive mode than it is in sport mode therefore many only drive in sport mode. I think that the newest TSB moves eco and drive towards sport and I say that because I feel that eco and drive are now more sensitive. In other words now when I step on the pedal I don't have to push as far to get the car moving, before it was dull and now it is a bit more sensitive. Is it now the same as sport mode, not even close.
At least this is my completely "subjective" theory. Does anyone else feel the same??

BensonTT

Does it hold the gear like sport mode thou?

GSFRX350

Well all they will do or have done is change the mapping to be more like Sports mode, fuel consumption will suffer though - that's the reason Drive mode was/is like it is, to have a better fuel economy figure.

So has Sport mode changed at all do you know?

Nail34

Just completed my 20k service, '17 f-sport.
Yes, I thought of that. I could not tell the difference in sport or sport+.
I recently experimented using 1 full tank in eco and 1 in sport, I did this twice in similar driving conditions. In one, eco was slightly better and in the other, sport was 1/2 mpg better. Not very scientific, but still I was surprised at the results. And even if eco was always slightly better, for me the mapping update would still be well worth it.