My 2021 M3P with 18,900klms on the clock had a BMS_a079 error show up after an OTA update the other day (V12 2024.26.7). My car was at 68% SOC but refused to charge any further (was set to charge to max of 80%). After doing what you showed to unplug the connector under the rear seat, waiting about 15 minutes, then replugging it again - the error was gone and charging resumed to normal. Perfect. Did not have to disconnect the low voltage battery in the frunk either. Simple and effective. Many thanks for the tip! Worked a treat :)
If you’re going to disconnect the plug under the seat, you also need to disconnect the 12v battery at the front or you won’t achieve anything. That plug under the seat controls the high voltage to low voltage DC converter that chargers the 12v battery using the main battery. Disconnecting it shuts off the main battery and disables the power going to the 12v battery. However, the 12v battery is still connected so the low voltage stuff such as the computer is still receiving power. If you want to do a full reboot, you need to have the 12 battery disconnected too and the converter. Leave them both disconnected for 15 minutes or so to allow any capacitors to discharge and then connect them. The proper order on which to do this is in the service manual :)
@@guangyangchen3915 Yes, disconnect the DC-DC converter AND the 12/16v battery for a couple minutes to fully discharge the car. Disconnecting one but not the other has the potential to keep the 12v/16v system energised.
I have a 2021 Tesla Model 3 long range. My screen had become glitchy after I cleaned it. I couldn't use any of the menu buttons the three dots in the center on the bottom. I also couldn't use the navigate search button. Step one of pressing the two buttons on the steering wheel soft reset work for me. Thank you for this video.
@thepowahline method 1 do not work so .. for..method 2 i want to reboot when i unplug the plug on the backseat and replug after 3 minutes will the also screen reboot?
I haven't had a screen issue before, I would contact Tesla directly if not urgent. However, if you try the unplug method then please unplug the 12v battery first before the main battery under the back seat
the last method, do I need to power off on the touch screen and plug off the negative? also, do I need to also plug off the rear seat plug in method 3?
Hi talen, for a full power cycle, you have to power off via touch screen, then unplug the DC battery under the hood, then you can unplug the battery under the rear seat. This is the safest method
Model Y has the main battery disconnect clip under the front hood. Much easier. Replaced the 12v lead acid battery with lithium which caused false SW voltage alarms for about a year after heavy use while parked. I know they were false because the battery was putting out 14v. Had to do a few battery resets the first year to clear it. But haven't seen that problem for a year so I think they fixed the SW. Anyway, haven't had any camera problems since replacing the 12v battery.
I don't have a video myself for model Y but check out the 6 minute mark of this video ruclips.net/video/cPjtHkIUNsY/видео.html He also unplugs the high voltage loop before the 12v with no issues and explains the noises I experienced which is nothing to worry about
Please follow the following guide to unplug 12v first before unplugging main battery (under rear seat). Although unplugging the main battery works for quick fixes, it is safer to unplug 12v first: service.tesla.com/docs/Public/diy/model3/en_us/GUID-2588F809-41E3-43F1-84E5-6745C7C18DBE.html
Thanks for pointing that out, I believe this is the 16v link service.tesla.com/docs/Model3/ServiceManual/2024/en-us/GUID-C392D1B4-3007-45A4-A469-1B92676863F1.html
According to the warranty coverage, an unplug looks ok as it's not really an attempt at "service" which implies a hardware change or fix. I'm simply resetting the software. As stated, do it at your own risk though. Warranty: "The Model 3’s battery warranty does not cover damage due to fire (except in the case of battery fire in the conditions mentioned above), failure to follow best battery charging practices, attempts at service by non-certified personnel, or battery compartment flooding."
I just got my Tesla from a dealership and accidentally put it in valet mode and don’t know the code and it’s still linking to my phone so I can’t take it off
If you forget your valet PIN, reset it from inside the car by entering your Tesla Account credentials (which also cancels Valet mode). You can also reset your PIN using the mobile app in the controls section
@@thepowahlineI just got a tesla from hertz and I press the valet mode button accidentally and I called them but they don’t know the pin code either, 😔
NOT the right way to do a 12v reset. Power off the screen, disconnect the 12v, and then disconnect the plug just BRIEFLY shown at 4:49. If you follow that loom you'll see the fireman sticker around it. New model 3's DO NOT get the connector unplugged under the rear seat that's ONLY for older ones. PLEASE ANYONE WATCHING THIS VIDEO DO NOT DO WHAT IS SHOWN!!!!
Are you sure this isn't just the latest model Y's? The model 3 manual states that the first responders loop is where you are pointing out. Do you have a link to this info? If this is the case then I will add it as a disclaimer
@@thepowahline I am absolutely sure…that is the first responder loop but there’s a connector for it on new 3’s…old 3’s the loop had no connector so you had to go to the connector under the seat…I don’t have a link but let’s just say you can trust what I’m saying…the main thing is how you went about disconnecting power, it’s not the right way to do it…never disconnect the loop connector without disconnecting 12v first…sure nothing happened this time in your video but the way you powered your car down can damage the contactors in the HV battery…eliminate all electrical loads before disconnecting the loop connector…climate system off, screen off, 12v, then loop connector…the problem with disconnecting the under seat connector is it wasn’t meant to be disconnected too many times that’s why on new 3’s they added the connector on the loop so you don’t have to undo the seat connector anymore to extend the life of it…again, sorry for no link but think of it like an electrician giving you advice about how to wire a ceiling fan…you’d probably listen right? Catch my drift?
Thanks for that, I already added the "12v disconnect first" to my disclaimer when raised a few months ago. The whole process is at own risk. I may need to make a follow up video to make sure people follow the new process (and maybe one for new connector too). Cheers for the details
Hi Curt, I needed to drive that day so required the cameras working asap for my safety on the road (Tesla service booking was 3 days wait). As you are sure my method is incorrect, please enlighten everyone with the proper method - I will make another video of it I have always stated to do this at your own risk and it is most likely used by viewers as a last resort in emergencies only. Anyone not comfortable will always contact Tesla first IMO Tesla cameras should never go blank like this ever as they are a necessity given how the cars blind spots cover quite a big area, especially with child seats also partially blocking the rear window
@@thepowahline A hard reset requires screen power down, disconnect of 12v and then contact connector disconnect. A disconnect of the plug under the seat without the 12v may cause hardware issues in the future. If you are having hardware issues vehicle firmware may need to be re-installed at a service center. Partial or full package re-installs maybe be required. Cameras are an added safety feature but are not imperative to safely driving the vehicle.
Thanks, I will add that disclaimer to the video. If this was a firmware issue then the unplug wouldn't have fixed the issue I would have thought. It hasn't happened again since. Agreed that cameras aren't needed to drive safely however reverse cameras have been staple of new cars for the past decade and if you are used to driving with the blind spot cameras, driving in a different way is an increased risk. Accidents happen with delays to these split second checks and decisions
@@CurtJ007 when you already trained your brain to drive with a cameras and use them to switch lanes its kinda hard to just not look at the screen and drive a tesla like a normal car
You would have got away with just undoing the minus in the 12 volt for 5 minutes. But unconnected HV can obviously do the trick also. So much computers these days and not so easy to make them powerless, just like a laptop you need to remove the battery so,e times to make a reset.
Agreed, there should more extensive testing on each software release to avoid such glitches. I would take less updates in return for increased stability if that was an option
Looks like you'll have to unplug a fuse? Check this out and perform at your own risk: teslamotorsclub.com/tmc/threads/model-s-required-hard-reset.38097/
My 2021 M3P with 18,900klms on the clock had a BMS_a079 error show up after an OTA update the other day (V12 2024.26.7). My car was at 68% SOC but refused to charge any further (was set to charge to max of 80%).
After doing what you showed to unplug the connector under the rear seat, waiting about 15 minutes, then replugging it again - the error was gone and charging resumed to normal. Perfect. Did not have to disconnect the low voltage battery in the frunk either.
Simple and effective.
Many thanks for the tip! Worked a treat :)
Have u gotten the error code since?
@Reagan75959 no but tesla have now replaced the battery under warranty 😊
If you’re going to disconnect the plug under the seat, you also need to disconnect the 12v battery at the front or you won’t achieve anything.
That plug under the seat controls the high voltage to low voltage DC converter that chargers the 12v battery using the main battery.
Disconnecting it shuts off the main battery and disables the power going to the 12v battery. However, the 12v battery is still connected so the low voltage stuff such as the computer is still receiving power.
If you want to do a full reboot, you need to have the 12 battery disconnected too and the converter. Leave them both disconnected for 15 minutes or so to allow any capacitors to discharge and then connect them.
The proper order on which to do this is in the service manual :)
Not a 12v it's 16v
I thought leaving them both disconnected for one or two mins would be sufficient.
@@MottyRuttner 2017 - 2021 are 12v, newer are 16. But regardless, what I said is true.
@@guangyangchen3915 Yes, disconnect the DC-DC converter AND the 12/16v battery for a couple minutes to fully discharge the car. Disconnecting one but not the other has the potential to keep the 12v/16v system energised.
@@iambenmitchell 👍
Thank you so much! My Model Y wouldn’t charge while on a road trip and not enough range to reach the service center. I appreciate this so much!!!
Thank you so much. This worked for me this morning saved me a lot of hassle having to get to service
I have a 2021 Tesla Model 3 long range. My screen had become glitchy after I cleaned it. I couldn't use any of the menu buttons the three dots in the center on the bottom. I also couldn't use the navigate search button. Step one of pressing the two buttons on the steering wheel soft reset work for me. Thank you for this video.
@thepowahline method 1 do not work so .. for..method 2 i want to reboot when i unplug the plug on the backseat and replug after 3 minutes will the also screen reboot?
I haven't had a screen issue before, I would contact Tesla directly if not urgent. However, if you try the unplug method then please unplug the 12v battery first before the main battery under the back seat
I bought a Tesla Model 3 at the auction, does it come with valet, does the reset work?
the last method, do I need to power off on the touch screen and plug off the negative? also, do I need to also plug off the rear seat plug in method 3?
Hi talen, for a full power cycle, you have to power off via touch screen, then unplug the DC battery under the hood, then you can unplug the battery under the rear seat. This is the safest method
Good lucks my G. It works now 😎
Great vid - good info. Thanks
This works so well guys!!
Model Y has the main battery disconnect clip under the front hood. Much easier. Replaced the 12v lead acid battery with lithium which caused false SW voltage alarms for about a year after heavy use while parked. I know they were false because the battery was putting out 14v. Had to do a few battery resets the first year to clear it. But haven't seen that problem for a year so I think they fixed the SW. Anyway, haven't had any camera problems since replacing the 12v battery.
Do you have a video showing exactly where under the Frunk?? For a model Y June of 2022
I don't have a video myself for model Y but check out the 6 minute mark of this video ruclips.net/video/cPjtHkIUNsY/видео.html
He also unplugs the high voltage loop before the 12v with no issues and explains the noises I experienced which is nothing to worry about
Help i have a new model 3 and i dont know what to do with the 12v
Please follow the following guide to unplug 12v first before unplugging main battery (under rear seat). Although unplugging the main battery works for quick fixes, it is safer to unplug 12v first: service.tesla.com/docs/Public/diy/model3/en_us/GUID-2588F809-41E3-43F1-84E5-6745C7C18DBE.html
Wrong link it's the 16v battery not the 12v
Thanks for pointing that out, I believe this is the 16v link service.tesla.com/docs/Model3/ServiceManual/2024/en-us/GUID-C392D1B4-3007-45A4-A469-1B92676863F1.html
How does Tesla feel about your methods. Any warranty, safety issues
According to the warranty coverage, an unplug looks ok as it's not really an attempt at "service" which implies a hardware change or fix. I'm simply resetting the software. As stated, do it at your own risk though.
Warranty:
"The Model 3’s battery warranty does not cover damage due to fire (except in the case of battery fire in the conditions mentioned above), failure to follow best battery charging practices, attempts at service by non-certified personnel, or battery compartment flooding."
Having same exact issue today. Thanks bro
Update: this did not resolve my issue. Tesla said my issue is a firmware booting loop that has to be resolved via their mechanics
Thanks for the update, that must be such a rare case
@@stocktawkwas it covered under warranty?
Does a hard reset mean also changes to all my settings?
I didn't notice any of my settings change when I did the hard reset. PIN was still set and general settings stayed the same
I just got my Tesla from a dealership and accidentally put it in valet mode and don’t know the code and it’s still linking to my phone so I can’t take it off
If you forget your valet PIN, reset it from inside the car by entering your Tesla Account credentials (which also cancels Valet mode). You can also reset your PIN using the mobile app in the controls section
@@thepowahlineI just got a tesla from hertz and I press the valet mode button accidentally and I called them but they don’t know the pin code either, 😔
Oh no! Unfortunately you'd need to be the owner for the service centre to help you out. Resetting won't unlock valet mode
NOT the right way to do a 12v reset. Power off the screen, disconnect the 12v, and then disconnect the plug just BRIEFLY shown at 4:49. If you follow that loom you'll see the fireman sticker around it. New model 3's DO NOT get the connector unplugged under the rear seat that's ONLY for older ones. PLEASE ANYONE WATCHING THIS VIDEO DO NOT DO WHAT IS SHOWN!!!!
Are you sure this isn't just the latest model Y's? The model 3 manual states that the first responders loop is where you are pointing out. Do you have a link to this info? If this is the case then I will add it as a disclaimer
@@thepowahline I am absolutely sure…that is the first responder loop but there’s a connector for it on new 3’s…old 3’s the loop had no connector so you had to go to the connector under the seat…I don’t have a link but let’s just say you can trust what I’m saying…the main thing is how you went about disconnecting power, it’s not the right way to do it…never disconnect the loop connector without disconnecting 12v first…sure nothing happened this time in your video but the way you powered your car down can damage the contactors in the HV battery…eliminate all electrical loads before disconnecting the loop connector…climate system off, screen off, 12v, then loop connector…the problem with disconnecting the under seat connector is it wasn’t meant to be disconnected too many times that’s why on new 3’s they added the connector on the loop so you don’t have to undo the seat connector anymore to extend the life of it…again, sorry for no link but think of it like an electrician giving you advice about how to wire a ceiling fan…you’d probably listen right? Catch my drift?
Thanks for that, I already added the "12v disconnect first" to my disclaimer when raised a few months ago. The whole process is at own risk. I may need to make a follow up video to make sure people follow the new process (and maybe one for new connector too). Cheers for the details
I can assure you, you did not do the hard reset properly and risk damaging components, please do not do the hard reset from the battery pack this way.
Hi Curt, I needed to drive that day so required the cameras working asap for my safety on the road (Tesla service booking was 3 days wait). As you are sure my method is incorrect, please enlighten everyone with the proper method - I will make another video of it
I have always stated to do this at your own risk and it is most likely used by viewers as a last resort in emergencies only. Anyone not comfortable will always contact Tesla first
IMO Tesla cameras should never go blank like this ever as they are a necessity given how the cars blind spots cover quite a big area, especially with child seats also partially blocking the rear window
@@thepowahline A hard reset requires screen power down, disconnect of 12v and then contact connector disconnect. A disconnect of the plug under the seat without the 12v may cause hardware issues in the future. If you are having hardware issues vehicle firmware may need to be re-installed at a service center. Partial or full package re-installs maybe be required. Cameras are an added safety feature but are not imperative to safely driving the vehicle.
Thanks, I will add that disclaimer to the video. If this was a firmware issue then the unplug wouldn't have fixed the issue I would have thought. It hasn't happened again since.
Agreed that cameras aren't needed to drive safely however reverse cameras have been staple of new cars for the past decade and if you are used to driving with the blind spot cameras, driving in a different way is an increased risk. Accidents happen with delays to these split second checks and decisions
@@CurtJ007 where is the contact connector? Service center is just bunch young idiots with no responsibility. TIA
@@CurtJ007 when you already trained your brain to drive with a cameras and use them to switch lanes its kinda hard to just not look at the screen and drive a tesla like a normal car
You would have got away with just undoing the minus in the 12 volt for 5 minutes. But unconnected HV can obviously do the trick also. So much computers these days and not so easy to make them powerless, just like a laptop you need to remove the battery so,e times to make a reset.
Agreed, I don't think my laptop has been "powerless" for years.
Sad that you have to do this with a brand new car.
Agreed, there should more extensive testing on each software release to avoid such glitches. I would take less updates in return for increased stability if that was an option
Mine is Fk up already in less than a month. Service center can't do Jack. I have to try this method.
It only gets worst from there. I'm a 5 year owner of a 14 S......first 3 1/2 were great. Headache since.
@@deelewis8061 it's all hyped 300 miles range can only get you 200 mikes or less. EV got long way to go.
Can someone pls hel pme find out for my model s 2013🥲 it will cost me 663 bucks at tesla otherwise..
Looks like you'll have to unplug a fuse? Check this out and perform at your own risk: teslamotorsclub.com/tmc/threads/model-s-required-hard-reset.38097/