Has anyone experienced this? I have a 2017 model. 32K miles. Been having some odd shifting and slippage from 2nd to 3rd gear intermittently and finally got it to the dealer and they are reporting this active code that doesn't throw a CEL: Body Control Module / ECU: NO CE LIGHT CURRENTLY ON. ACTIVE CODE FOR THE TORQUE-VECTORING DIFFERENTIAL ECU ASSEMBLY. Part: 899C030012

So that'll be $6700 through the dealer or $4500 direct from Lexus - either way...WOW. If anyone has any suggestions or experience here or has hassled Lexus for support in the past for items like this that should really never fail anywhere near 32K miles, let me know. Considering buying a used part as well:
https://www.augustpohl.com/used-part...NT_MOD/850918/

 

What is exactly the fault code and did they follow the strict steps to determine if it’s the ECU that is at fault, and not connectors, wiring loom or the differential itself ?

is this repair under warranty? If so then probably doesn’t matter as it’s not at your cost.

 

They are saying it is definitely the ECU... bunch of codes in the screenshot they sent me...B2620, C1241, U0140, C2A00, UO142, UO155, B1206, UO163, C1A47, C1AAE, B1326, B1542

 

The service manual says replace ECU period. I looked at this myself.

 

The new part is

899C0-30012 (04/2017 - )

Is your car using the old part that had the issue? I.e. What was the year of manufacturer of your GS?

899C0-30011 (02/2016 - 02/2017)

I am guessing the new part fixes a number of issues with the old.

 

Well that helps. Which one of those many codes is the focal point?

 

I posted recently about my dash displaying the TVD malfunction on my 2016. It came up just once and never came back. No shifting issues. I'm at 65k miles. When I go in for my next oil change I will be asking them to diagnose what happened. When the malfunction happened it went away after I restarted the car. But at the time, the car locked me out of being able to change the TVD settings (showed up as a faded icon on my dash).

The TVD has been the only thing I have worried about with this car. Does anyone know if it's possible to swap a torsen into a GSF as a last resort (instead of replacing the unit for $20k)?

 

I just saw 703's question. I'll confirm and circle back...

 

That's very unfortunate. I hope you get this sorted out amicably.

 

If anyone knows how to contact Lexus in writing either via mail or email vs calling the number, let me know. I'd like to clearly layout my case in writing for consideration, but if calling is my only option, I will be doing that this week.

 

Update for anyone tracking along with this - appealing to Lexus directly was a disappointing fail. The contact I was working with sounded like they were 19 years old and didn't have a good understanding of what was going on and being claimed and even after speaking to the case manager Lexus gave me nothing to work with. I pointed out that the Powertrain warranty states that the Engine Control Computer is covered, but they would not provide any feedback regarding that claim and left me hanging altogether. So I have spoken to a lawyer and will be sending a letter to Lexus and going through the motions, but I'm not super confident that anything is going to happen in my benefit - at least not quickly.
Due to a job change I am making and the associated pay cut, I have two vehicles I need offload and this GS-F is one of them. I am toying with cutting my losses and buying an ECU to have it correctly fixed for the next owner. Question to community: does anyone think a brand new OEM ECU vs a used ECU from a 32K mile vehicle that is successfully programmed by dealer, makes a difference to next owner? I could save almost $3K with the used unit...

 

Sorry to hear this. I’m in the same boat but actually just sold my GSF because my TVD ECU malfunctioned again and all of a sudden half the direct and port injectors needed to be replaced after my warranty period. Lexus sent a guy to the dealer to check the car out and confirmed. $13,000 for both repairs. The dealer has already listed the car for sale but still repairing the car (which is odd to me).

I’m actually relieved to be out from under it. I’ll probably move to an RCF without TVD.

 

and the TVD was supposed to be so awesome!

 

I’m kicking myself for not getting an ISF. The TVD was a cool feature but hardly worth the replacement cost-performance ratio. I worry for the people who end up buying used GSFs decades from now for $20k.

I’m still pissed about the experience. I might just get a reliable daily and then something more exotic for the weekend.

 

I think I've said this before. I like the OS Giken LSD better than the TVD. I have them both, drive them both interchangeably, and the Giken spool wins hands down every time. I'll take the 68 pound weight reduction too. I guarantee you if I have a TVD issue now, I won't be fixing a TVD, I'll be getting a standard diff, stuff a Giken spool in it, and get the right axles to work with the diff and call it good forever.