I must say that after the ECU update I can not detect any droning anymore. The car keeps the gears low to avoid any lugging. So far in happy with the ecu update

 

Got my TSB done today. It definitely made acceleration a little better. I put a tank of Regular gasoline and ran just fine.

 

Trying to get the TSB applied but my dealership says my VIN is not covered but it is according to the paperwork I saw. 2016 F-Sport AWD built in May 2016. They want me to pay a $150 diagnostic fee first no way.

 

what a rip off. File a complaint with Lexus. They read these forums but won't acknowledge that the tsb hasn't been a success for all affected cars.

 

Already done, I have a case # and hope to hear from a case specialist by early next week. That was the best the Lexus US consumer relations rep could do for me.

Ya I was shocked when heard I would have to pay a $150 fee first. If my VIN falls within the affected range it should be no questions asked for being less than a year old. Being our first Lexus this whole situation makes me question returning to their brand in future automobile purchases.

 

We are considering another RX when our lease is up within the next 4 months, and while there may be a few subjective things that are holding us back, the hesitation issue is my main concern because I have dealt with hesitation issues before.

Before the RX we had two ML350's, a 2012 and 2011, and while there was a slight hesitation with the 2012 the 2011 was so bad that after 15 months of fighting MBUSA agreed to buy it back.. The issue was similar to what has been described here but slightly worse, and the ML's had only 7 gears..

So everytime I read this thread it reminds me of what we went through and I certainly don't want to deal with this again.. Maybe I should consider the 450h F Sport instead?

 

I was very happy after the update as it very much helped the early hesitation issues below 30 MPH which was complete nightmare, now however after driving it about 3K after the update the issue is now in between I would guess 4/5 gear as once I am at about 50mph and I try to get on it I now get the sling shot rubber band feel. It feels like it needs to build up the power and then releases it like sling shot very annoying and dangerous especially on highways when passing. It actually gets me so mad I literally slam on gas pedal because I am so aggravated at the feeling it gives as even the passenger feels it. I have a 16 LS where the the technology is very out date compared to RX, but it certainly doesn't shift like this truck.

Otherwise I really like this truck with all technology, but this is really a big factor as I drive a lot and at this price tag it shouldn't be doing this at all. If I bring it back to dealer they will try to help but honestly there nothing they can do as they don't design this software for transmission. My advise would be at least wait until next year as most all of them will have 3rd row and hopefully they figure out this transmission programming by then.

 

2016 RX350 hesitates at 1500-2000 RPM. As if transmissoin is having trouble finding the right gear.
Lexus has admitted something is wrong but not saying what it is. Does anyone else have this problem
or has had it fixed?

 

how so you submit claim to corporate?

 

Don't buy a LEXUS. We should all form a class action suit

 

Has anyone with a F sport had the ECU update done? Are your Sport + and customizing drive settings still there?

My Sport + and customization have disappeared. Looks like they appointed the regular RX program to the F sport.

 

dealer forgot to do the battery reset. Those settings will come back but that's besides the bigger issue that Lexus can't even instruct dealers properly on how to handle the tsb. It's not a complete fix either.

 

The TSB definitely worked for me - no more droning and much better acceleration! I drive through local streets a lot and the droning was getting on my nerves. The only thing one needs to make sure is that the dealer disconnects the negative battery terminal for about 10 minutes to reset the system and let it load the new ECM software. My dealer didn't do this although the service manager assured me that the tech would do what the TSB stated in order to apply the software update properly. After about a week of driving after they applied the TSB update, I only noticed a slight improvement with hesitation (may be due to placebo effect) but still had the vibrations from the droning so I decided to disconnect the battery myself. After I reconnected it, the nav screen was saying that the system was being reloaded. I didn't lose any settings/personal presets - only the map mode and day/night mode in the nav changed to default (that's how I knew that the dealer didn't disconnect the battery otherwise the nav would switch to the night mode in the evening and I had it set to day only). Also, I had a slight issue with the tailgate. I left it open before disconnecting the battery and after the reconnect it wouldn't close - just kept beeping when I press on the close button either on the remote, dash, or remote. I figured that the tailgate ECU (the tailgate has its own computer on RX!) got confused about which state the tailgate was in when the battery got disconnected. So, I pulled the door down manually - it took a bit of effort but it went down slowly and closed by itself at the end the way it usually does. After that it started working normally so don't be afraid to pull the tailgate down manually if it happens to you - I almost called Lexus roadside assistance before I figured it out myself.

 

Well I'm currently on my third Lexus going back to 2006 and to this point they have been mostly trouble free. IME with Lexus vehicles (not that I doubt what anyone is experiencing here) reading this thread it is almost unbelievable for a Lexus. But even if I don't get another RX next time around there is a good chance we will remain in the Lexus family and get a GX..

But as I mentioned in my previous post, this hesitation issue that RX owners here have experienced has me concerned enough to possibly stay away from an RX350 until Lexus has the issue resolved.

 

Tried disconnecting the battery just in case the dealer forgot. Unfortunately this had no effect on mine, Still shifts into high gears
way to soon. What bugs me more is the vibration that occurs around 1500 rpms. Its not horrible but once your aware of it, it s really annoying. This could be such a smooth driving vehicles if it wasn't for that.