DIY Fix for no LTE/WiFi connectivity bug

[NLH]

This is the correct way to reset the TCU. I would just like to reiterate that Lucid absolutely does not recommend you do this yourself, at present, and would absolutely say that you have service do this instead.

I have no dog in the fight, just wanted to be super clear about it.

But yes, this is how service resets the TCU.

Can the car be in park when the TCU is reset? Or does the car need to be asleep?

 

[Mirage]

Can the car be in park when the TCU is reset? Or does the car need to be asleep?

car can be in park but you'll probably need to do an air reset after you reset the TCU. Did the same procedure this morning, but worked perfectly.

 

[NLH]

Did it fix the problem? Anything I should be careful about when I try to do this myself? Does the cord pull out easily?

 

[Mirage]

Did it fix the problem? Anything I should be careful about when I try to do this myself? Does the cord pull out easily?

It definitely solves the problem. When you remove the power there is a tab across the top of the plug that you must depress to remove. Just make sure you do that with a short screwdriver or your finger if you can get your hands in there. It's tight, but can be done without removing the TCU. If you need to remove it, the socket is good ole 10mm. Just be extra careful to not drop the nuts.

 

[ruchik]

Hi all. My 24 Air Pure recently decided to stop connecting to LTE and WiFi. There are a few reported instances of this on the forum. No amount of software reboots can fix this, and all users that have posted about this had to bring their car in for service to address this. After dealing with this for a few days, and the service only offering to see the car in ~3 weeks, I found a simple solution myself.

I read about a report or two that the technician fixed this super quickly after crawling in the back seat. Here is the solution you can try yourself if you face this issue.

Fold down both back seats. Peel up the carpeted Velcro flap connecting the bottom of the folded part of the seat to the trunk. Underneath this you’ll see a module labeled TCU. Reach down and unplug the main connector (the only one with multiple wires). Wait a few seconds and replug. After a few minutes LTE and WiFi should return.

Since this is what dealers are clearly doing and users on the forum aren’t reporting the issue coming back, this should be a safe try.

I’ve also seen documentation claiming a slightly different location for the TCU (towards the passenger side of this same area but on the wheel well).

I did locate the TCU, mine was towards the passenger side. Dumb question though. How do you disconnect the TCU? Do I have to squeeze and then pull the connection? Or can I just yank on the connection? It’s an awkward angle to reach so I want to be careful as I can’t see where the plug inserts.

 

[mjdavis328]

I ended up not unplugging myself and my connectivity just came back a couple days ago. This was after 2.5 weeks of it being offline. There wasn’t a software update (I wouldn’t have gotten it anyway bc no connectivity) but there was an iOS app update and the next day my connectivity was back. I can’t imagine how an app update and unlocking the car with the mobile app key would have done anything. I’m just assuming the TCU may just periodically reset itself.

 

[KITT]

Welp seems like this is the problem I have. Been almost 2 weeks and no response from customer care or service center. Looks like I’ll have to do it myself.

 

[mcr16]

We are aware of the connectivity issue. There is a fix coming in the next over-the-air update.

 

[KITT]

We are aware of the connectivity issue. There is a fix coming in the next over-the-air update.

But if I can’t connect to lte or WiFi how do I get the update?

 

[mcr16]

But if I can’t connect to lte or WiFi how do I get the update?

If you don’t mind messaging me your contact info, I will follow up regarding the service requests you made.

 

[LuciusAir-DC]

I’m in the same position. Had my new MY25 for about three weeks and then this problem happened. I called customer service and they said mobile service could reset it easily and quickly. Then I called service and they gave me a service appointment for February. They wouldn’t send mobile service because it wasn’t a safety issue. Its been below freezing and snowing for weeks in DC, we’ve really missed the app connectivity to remotely warm up the car.

Service also told me a coming OTA update would fix the issue, but idk how the car would get the update with no connectivity. The app, time, and navigation don’t work, but interestingly, if I ask Lucid Assistant what time it is, it tells me the correct time. Weird.

 

[DeaneG]

...this problem happened.... I called service and they gave me a service appointment for February....

I hope yours "fixes itself" in a day or two as mine did.

 

[Nitemist]

I ended up not unplugging myself and my connectivity just came back a couple days ago. This was after 2.5 weeks of it being offline. There wasn’t a software update (I wouldn’t have gotten it anyway bc no connectivity) but there was an iOS app update and the next day my connectivity was back. I can’t imagine how an app update and unlocking the car with the mobile app key would have done anything. I’m just assuming the TCU may just periodically reset itself.

Weird, same thing happened with me. Offline for 2.5 wks and then it just started working again all of a sudden. Only realized it was back online because I got OTA update notification. Then I got 3 updates in a row and now on 2.5.4.0 version. That was weird. It's like I got removed from some blocker or something. I'll monitor if it goes offline again. I had mobile service scheduled for this issue, but wondering if I should keep it just to have tech come out and check other issues like rattling center speaker during phone calls and wind noise and excessive draft through my driver side window/door

 

[kismalac]

Similar experiences here. The TCU froze(? i.e., lost LTE and WiFI at the same time) about 2-3 weeks into my ownership and needed a mobile technician's visit. After he reset the TCU it worked for about a week and lost connectivity again. I developed a hunch at the time that there was a conflict between LTE and WiFi. I used to be on ATT and knew their coverage was crappy where I live, and my Wifi signal in my garage was not optimal (I was on Wifi5 at the time) so I knew the car was likely struggling to get online (e.g. takes forever to wake up) Acting on this suspicion, I kept Wifi off for the next few weeks as I had several road trips planned around Christmas where EA charging was a must but - and it worked well. When I returned home, I turned Wifi back on, and lost connectivity in less than 24 hours - this is the third time in 2 months. The mobile technician reset it again, and I've kept wifi off ever since ... which seems to be the only workaround for now. Technician did confirm this is a SW bug, and it'll be fixed at some point. While it is a major nuisance, it makes very little difference practically other than the slow wakeup.

 

[Mirage]

Similar experiences here. The TCU froze(? i.e., lost LTE and WiFI at the same time) about 2-3 weeks into my ownership and needed a mobile technician's visit. After he reset the TCU it worked for about a week and lost connectivity again. I developed a hunch at the time that there was a conflict between LTE and WiFi. I used to be on ATT and knew their coverage was crappy where I live, and my Wifi signal in my garage was not optimal (I was on Wifi5 at the time) so I knew the car was likely struggling to get online (e.g. takes forever to wake up) Acting on this suspicion, I kept Wifi off for the next few weeks as I had several road trips planned around Christmas where EA charging was a must but - and it worked well. When I returned home, I turned Wifi back on, and lost connectivity in less than 24 hours - this is the third time in 2 months. The mobile technician reset it again, and I've kept wifi off ever since ... which seems to be the only workaround for now. Technician did confirm this is a SW bug, and it'll be fixed at some point. While it is a major nuisance, it makes very little difference practically other than the slow wakeup.

I'm experiencing similar issues and it appears to be related to poor signal (WIFI or LTE). It mostly happens when I'm at home with the WIFI on, but it has happened one time while I was at work and I know our LTE signal is terrible in our garage. The car has been sitting for the last 3 days at home and it has locked up twice requiring a reset. So like you I disabled WIFI and will let it run. I had done this previously and went a couple of months without issue. Hope they get this fixed soon.

 

[newlucidguy]

I did locate the TCU, mine was towards the passenger side. Dumb question though. How do you disconnect the TCU? Do I have to squeeze and then pull the connection? Or can I just yank on the connection? It’s an awkward angle to reach so I want to be careful as I can’t see where the plug inserts.

No, don't yank it! The top of the clip,in the center, is a tab. You must depress the tab to release it. Do that and gently pull the clip out with the wires. I use two thumbs to put it back in, I find it easier that way.