2006 rx400h code u0146

[phasmith]

Hi I need help. I have a rx400h 2006 150,000 miles, it's been faultless until the other day I came to start car and it started fine and then hybrid check light and Vsc light came on, I continued to drive and got home fine, the next day I decided to replace 12v Battery, but it is still the same, I also have various other electrical problems that are related to this.....tailgate won't open, mirrors won't work, electric Windows only work off individual button, no cruise, afs lights don't work, central locking works off fob( delayed) but not off button inside car, also you can hear the central locking make a noise once the door is closed. The car still drives fine, charges as it should. I've checked all fuses, I've plugged it into diagnostic and it only shows 1 code, u0146....lost communication with gateway a.  Seems like alot of people have this problems but no solutions too it.  Any help appreciated thanks

[Farqui]

Hi' welcome to the forum.

Has your vehicle had all the recall work done?  2004-6 vehicles maybe affected with a soldering issue that can light up the dash.

You can check if your vehicle had had this work done on the Lexus website 😉 

More info; https://blog.lexus.co.uk/lexus-announces-voluntary-recall-of-rx-400h-in-the-uk/

[crosscyl]

Another thread with the same issue ! No one has ever got to nail this one 😞 

 

 

 

 

 

Hopefully someone somewhere can after all give us their 2 pence on this somewhat unique but not totally rare one. Cheers 🙂 

[crosscyl]

Currently going through another episode of this 🤨. Been to a specialist previously about it - no joy. No water ingress. No one  seems to know what this one’s about. Rare one but certainly not totally unheard of as the above threads all describe the same very specific features. One to ignore I suppose as car is flawless otherwise. Just really annoying as boot can’t be opened during ‘the episode’ (can last one day or more) until it eventually self resolves itself, no memory seats during it, only driver’s window works from driver’s panel. Other windows only work from individual doors. My hunch says its a faulty control module somewhere which plays up only randomly without any links or asscoiations or triggers. The codes don’t persist. Indy said there was something which suggested some voltage variations but he couldn’t nail the root cause. Exhausted the forums. Doubt even a main dealer will nail this one. How frustrating. Anyone up for a challenge to try figure / diagnose this one (in person or remotely) - feel free to get in touch - I’ll more than happily drive some distance to have this never occur again !! I’d hate to sell it onwards to an unsuspecting buyer like this. Almost certain why the private seller I got it from shifted it. Can be episode free for months ...so would be very easy to shift onwards. Any clues or suggestions gratefully appreciated, many thanks !!

[PCM]

On 7/2/2020 at 10:26 AM, phasmith said:

Hi I need help. I have a rx400h 2006 150,000 miles, it's been faultless until the other day I came to start car and it started fine and then hybrid check light and Vsc light came on, I continued to drive and got home fine, the next day I decided to replace 12v battery, but it is still the same, I also have various other electrical problems that are related to this.....tailgate won't open, mirrors won't work, electric Windows only work off individual button, no cruise, afs lights don't work, central locking works off fob( delayed) but not off button inside car, also you can hear the central locking make a noise once the door is closed. The car still drives fine, charges as it should. I've checked all fuses, I've plugged it into diagnostic and it only shows 1 code, u0146....lost communication with gateway a.  Seems like alot of people have this problems but no solutions too it.  Any help appreciated thanks

Did you make any progress on the issue, 'crosscyl'?

[crosscyl]

No luck yet i’m afraid 😞 

[m4rkw]

Hey since you're in London why not try a dedicated auto electrical specialist?

These guys are very good in my experience: http://www.electrumautoelectrics.com

[crosscyl]

4 hours ago, m4rkw said:

Hey since you're in London why not try a dedicated auto electrical specialist?

These guys are very good in my experience: http://www.electrumautoelectrics.com

Thank you so much. Really appreciate this suggestion to try an auto electrician. Cheers. I’ll report back if we manage to nail this one. Thanks again. 

[m4rkw]

8 minutes ago, crosscyl said:

Thank you so much. Really appreciate this suggestion to try an auto electrician. Cheers. I’ll report back if we manage to nail this one. Thanks again. 

Is it easy or even possible to reproduce the issue at will? If not then you might have to arrange with them that you'll drop the car off the next time it happens and let them get to it when they can. When everything's working correctly nobody will be able to diagnose it, you need to get it to them in the failed state so they can see what's happening with it.

[crosscyl]

Absolutely that’s what I’ll do. Unfortunately I cant simulate or reproduce it at will. Current episode seems to be lingering beyond 48 hours unlike previous times ...who knows how long this one will remain and prevent me from being able to open the boot ! Anyhow the auto elecrician route sure seems to hold some hope fingers crossed. I’ll give them a call after this bank holiday is over if it persists until them. If not, I’ll wait for the next episode and try and drive over to them the same day. There have been people out there who have had exactly 100% identical symptoms to what’s happening with mine - with forum threads describing the ditto features - unfortunately not a single one ever concluded it to say what it was or what happened eventually ...even if it was that they just sold the car in the end !! Not throwing in the towel here just yet.

[royoftherovers]

When it happens again, do NOT switch the power off, but drive straight to the auto electrician and let them examine the codes while they are still in the system.

[crosscyl]

Diagnostics taking place ...lets see what the outcome is. 

[m4rkw]

Good luck

[PCM]

On 7/2/2020 at 10:26 AM, phasmith said:

Hi I need help. I have a rx400h 2006 150,000 miles, it's been faultless until the other day I came to start car and it started fine and then hybrid check light and Vsc light came on, I continued to drive and got home fine, the next day I decided to replace 12v battery, but it is still the same, I also have various other electrical problems that are related to this.....tailgate won't open, mirrors won't work, electric Windows only work off individual button, no cruise, afs lights don't work, central locking works off fob( delayed) but not off button inside car, also you can hear the central locking make a noise once the door is closed. The car still drives fine, charges as it should. I've checked all fuses, I've plugged it into diagnostic and it only shows 1 code, u0146....lost communication with gateway a.  Seems like alot of people have this problems but no solutions too it.  Any help appreciated thanks

Did you manage to find a fix for your car, 'phasmith'?