Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register
  • Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
  • The final cut of TMC Podcast #27 is available now with topics time-stamped. We discussed: Consolidation in LiDAR manufacturers; Volvo EX90 shipping with LiDAR; FSD Beta Full Release in N.A.; FSD detecting autopilot cheats, Gwen Shotwell directly overseeing SpaceX Starship; and more. You can watch it now on YouTube. We should have it published to podcast networks shortly.

12v battery / vampire drain / humming noise... Tesla errors?? Warranty??

JMiZgz

New Member
Jul 21, 2022
4
0
Bergen
Hi everyone!

I’ve recently buy a S70D 2016 and notice a daily vampire drain up to 8%!! (No summing or sentinel) Also notice humming noise from the front that I don’t know if is related... but from yesterday I’ve got the message “schedule service to replace low voltage battery” when it was changed only 2y ago under warranty but not updated to the new one I think. Can everything be related?? Even if the car is not under warranty now, Tesla doesn’t replace the reported fail items for free?? 😕

Also, not even 1 year ago was replaced the VCM to MCU but maybe not upgrades til MCU2... that’s why I don’t have Netflix??

It’s annoying that a “premium car” doesn’t call you to replace the reported fails... Any help is welcome. Thx!!
 

ucmndd

Well-Known Member
Mar 10, 2016
9,445
18,338
California
The humming noise is a coolant pump which runs continuously on older vintage 70/85kwh batteries when the car is charged higher than about 80%. Lots of info here:


That pump running is the source of your battery drain. Your only real solution is to set your charge limit to somewhere under 80% and then it will stop.

Yes, if you don't have MCU2, you won't have Netflix.

The 12v battery needing replacement is likely not related. Older cars seem to chew through 12v batteries every couple of years. It could be contributing somewhat to your drain though - if it's not holding a charge the car has to "wake up" more frequently to top it off from the HV battery.
 

JMiZgz

New Member
Jul 21, 2022
4
0
Bergen
The humming noise is a coolant pump which runs continuously on older vintage 70/85kwh batteries when the car is charged higher than about 80%. Lots of info here:


That pump running is the source of your battery drain. Your only real solution is to set your charge limit to somewhere under 80% and then it will stop.

Yes, if you don't have MCU2, you won't have Netflix.

The 12v battery needing replacement is likely not related. Older cars seem to chew through 12v batteries every couple of years. It could be contributing somewhat to your drain though - if it's not holding a charge the car has to "wake up" more frequently to top it off from the HV battery.
Thanks for info!
The limit was set at 80% so I still don’t understand... Regarding the 12V battery it’s a recurrent issue and I think there was an update/replacement from Tesla, right??
Is not possible to upgrade to MCU2 and keep still your two kidneys?? 😂
 

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top