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Charge Port Door Opens Spontaneosly

The charge port door is open frequently on our S, parked in our garage, when we enter the garage to use the car. Usually, I just close the door and go on my way. Has anyone else experienced this?

More. On 3 occasions, after closing the door, I heard the sound of the mechanism that opens it and it popped open again. Twice when this happened I was actually entering the car, or already in the car, and witnessed the display change to "Charge Port Door Open."

We were approaching 1,400 miles on the car the last time it happened. I was driving in slow traffic in a construction zone when I heard the telltale relay/solenoid sound from the rear of the car and the display changed to, "Charge Port Door Open." I closed it when I reached my destination.

I notified Tesla Service and added the problem to their list of items to address on a previously scheduled service call. It didn't happen while the Service Ranger was here. He was aware of it happening in their service facility when several cars respond to the open charge port command from one car. Our situation remains unresolved.

Update -- It hasn't happened in the garage since the car was taken away to a service center to find out why it discharged the battery to zero overnight. This was diagnosed to be because of a defective charging cable.
It doesn't explain the incident while driving described earlier.

I have the same problem. I have not figured out what sequence of steps causes it to happen, because it doesn't happen all of the time. On several occasions I have started driving with it open. There is a dash waring message, so all I had to do is pull over and close it. I think all of this started for me with the last software update, so I am hoping the next update will eliminate the problem. It seems it pops open after I have removed the plug from a public charger. It might be I need to go inside the car and stop the charging first, and then remove the plug. I often remove the plug when I approach the car.

I have the same problem. I have not figured out what sequence of steps causes it to happen, because it doesn't happen all of the time. On several occasions I have started driving with it open. There is a dash waring message, so all I had to do is pull over and close it. I think all of this started for me with the last software update, so I am hoping the next update will eliminate the problem. It seems it pops open after I have removed the plug from a public charger. It might be I need to go inside the car and stop the charging first, and then remove the plug. I often remove the plug when I approach the car.

I have this from the begining that occasionally the charge port or a rear door opens when I close the drivers door. However so far it hasn't happened while driving.
I am not too worried about it, but will mention it at the 12k service.

Do you have anything that uses an AMP sensor? Like some kinds of fitness monitor? I have a cadence sensor on my bike that I think triggers the charge port if it gets too close. Must use the same rf frequency.

Same deal here. It only happens at home, but I suspect it is related to the software routine that recognized places you have charged in the past.

After some consultation with Tesla and some testing in my garage it appears my port door opens because of an oversensitive UMC. If I unplug the UMC before closing the door, it doesn't pop open again in a few seconds as it does when the UMC is plugged into the wall. They do not think it is the software version I am on. I am not sure how to account for the time it popped open after charging at work (this took place last week).

@Lcaudie it sounds like you might have the same situation.

DJay -- The oversensitive UMC explanation doesn't account for the time our charge port popped open while driving, as described earlier.

Here is some feedback I received by phone from our Service center:

1. Based on analysis of the event log downloaded by the Service Ranger, and taken for evaluation, there were many unexplained RF signals received by the car that could have opened the charge port door. In one short period of time it received as many as 80 of them.
2. There are numerous items that operate in the unlicensed, low power frequency bands, any one of which could be a culprit. Neighborhood garage door openers, walkie talkies, toys, utility meter reading transponders, etc., etc.
3. If the car is locked when it is parked in a public place, the charge port door is locked. It won't open in response to external signals when unattended and attract vandalism.

I know from experience that a charger cable will pop open the doors on multiple nearby cars. The car lock/unlock is where the security lies. If the port can open while driving, it seems the software needs an update to disable the charge port while in drive.

I also have this issue and it's driving me nuts! (pun intended). My experience shows the following:

Only happens at home. Never yet while driving
Only happened with latest software update. Hoping 5.0 will improve it
Has been happening two or three times a week for the last month
Happened three times in a row this morning within 30 seconds while trying to get into the car to leave. Usually only happens once and occasionally twice

A couple things I'd like to add:

I have two garage doors with powered openers and I've had to disable one of them since I moved into this house three years ago since the door would spontaneously open on occasion. Most times while no-one was even home or at night while sleeping. This could be related to one of the posts here about other signals on the same frequency.

Another possibility could be that the button on the charge cable is somehow sending the signal over and over again. Perhaps it gets stuck?? I can test this by flipping the power box off so perhaps will try this for the next while to see what happens. If it still happens then it's not a sticky button. I'll report back when I have some info to share.

Allen, try unplugging your UMC from the wall outlet after you unplug the car, but before you close the the port door. In my case it solved the problem. The solution is to get a new UMC at my next service.

Got mine fixed. Service put a new charge port in. So far it hasn't happened ( 2+ weeks) again.

ISSUE ISOLATED...

From my previous post over two weeks ago I said I would test flipping the power box off just after unplugging my charge cable from the car... result is that the issue of the charge port reopening again is now GONE.

Next step is to leave the power on to the HPWC like I did before and see if the problem comes back, as it should. If it does then the issue is clearly with the HPWC cable and most likely the button is getting stuck. I'll report back with my findings within the next week or so, or as soon as the issue reappears.

... so that didn't take long...

If you've read my previous posts in this thread then I can tell you that there is a problem with my HPWC; likely with the button on the end of the charging cable. The issue with the opening port returned almost immediately. Last night I was having a battle with my car as the port kept opening when I got back into the car. After the third time I had to kill the power to the HPWC so that I could leave my garage.

Next email right after this is to my local Service Centre. I'll let you know what they say/do.

Cheers!

I've just completed recovering the transmission pattern from the UMC so that I could build key fobs and a transmitter board to open the MS charge port. The key fobs are for 1772 users that want it hanging on their handle and the transmitter board will be for inclusion in the OpenEVSE (which I have at home) so pressing the button on the OpenEVSE 1772 handle will open the charge port door (with luck, coding not done yet).

Anyway, Tesla transmits a very long string of bytes to get that darn port door to open. The transmitter does use the 315 Mhz ISM band but the pattern would seem to be very hard to "accidentally" replicate with another 315 Mhz ISM band transmitter like a garage door opener.

Issues with the UMC and HPWC would make a bunch more sense as they are at least transmitting the right message :)


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