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About the Battery
Model Y has one of the most sophisticated battery
systems in the world. The most important way to preserve the Battery is to
LEAVE YOUR VEHICLE
PLUGGED IN when you are not using it. This is
particularly important if you are not planning to drive
Model Y for several weeks. When plugged in, Model Y
wakes up when needed to automatically maintain a charge level that maximizes the lifetime of the Battery.
NOTE: When left idle and unplugged, your vehicle
periodically uses energy from the Battery for system tests and recharging the 12V battery when necessary.
There is no advantage to waiting until the Battery’s level is low before charging. In fact, the Battery performs best when charged regularly.
NOTE: If you allow the Battery to discharge to 0%,
other components may become damaged or require replacement (for example, the 12V battery). In these cases, you are responsible for repair and/or transporting expenses. Discharge-related expenses are
not covered by the warranty or under the Roadside Assistance policy.
The peak charging rate of the Battery may decrease slightly after a large number of DC Fast Charging sessions, such as those at Superchargers. To ensure maximum driving range and Battery safety, the Battery charge rate is decreased when the Battery is too cold, when the Battery’s charge is nearly full, and when the
Battery conditions change with usage and age. These changes in the condition of the Battery are driven by battery physics and may increase the total Supercharging duration by a few minutes over time.
Battery Care
Never allow the Battery to fully discharge. Even when
Model Y is not being driven, its Battery discharges very
slowly to power the onboard electronics. The Battery can discharge at a rate of approximately 1% per day, though the discharge rate may vary depending on environmental factors (such as cold weather), vehicle
configuration, and your selected settings on the
touchscreen. Situations can arise in which you must leave
Model Y unplugged for an extended period of
time (for example, at an airport when traveling). In
these situations, keep the 1% in mind to ensure that you leave the Battery with a
su
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(UMC_a017)
Charging speed reduced
High temperature detected by Mobile Connector
High temperature detected by Mobile Connector alerts indicate the outlet used to charge is becoming too warm, so charging has been slowed to protect the
outlet.
This is not typically an issue with your vehicle or your
Mobile Connector, but rather an issue with the outlet. A
warm outlet may be caused by a plug that is not fully inserted, a loose building wiring connection to the outlet, or an outlet that is beginning to wear out.
To regain normal charge speed, make sure your adapter
is fully plugged into the outlet. If charging speed does not return to normal, contact an electrician to inspect the outlet and building wiring connections to the outlet and complete any repairs needed.
If the outlet is worn, it should be replaced with a high-
quality outlet. Consider upgrading to a Tesla Wall
Connector for greater convenience and highest charging speed.
(VCFRONT_a182)
12V battery must be replaced soon
Software updates will not complete
until serviced
The 12V battery has aged or degraded and needs to be
replaced. Until the battery is replaced, vehicle software updates will not complete.
It is recommended to replace the battery at your earliest convenience. In the meantime, continue normal use of the vehicle.
The vehicle is still OK to drive with this alert present, for
a period of time. However, if you continually delay the 12V battery replacement, the vehicle may eventually not have enough power to start or restart.
If the 12V battery is too low to turn on the vehicle or open the doors, follow the instructions in
Jump Starting
the 12V Battery on page 195.
For more information on the battery system, see Battery
Information on page 156.
(VCFRONT_a192)
Electrical system power reduced
Vehicle may shut down
unexpectedly
The electrical system cannot maintain the voltage
required to support all vehicle features.
If you drive the vehicle while this alert is present, certain
features may be disabled or function at a reduced level due to the low voltage. It is also possible the vehicle will
shut down unexpectedly.
Try turning off non-critical features, like seat heaters or
cabin fans, to help the vehicle maintain electrical power
for as long as possible.
Eliminating or reducing usage of non-critical features
may allow the vehicle to reach its destination without
shutting down, although this is not guaranteed.
Schedule service before your next planned drive. The vehicle may shut down unexpectedly or may not restart without service.
(VCSEC_a221)
Air pressure below
recommendation for tires
Check pressure and refill air as
needed
This alert does NOT indicate that there is a flat tire.
The tire pressure monitoring system (TPMS) has detected that the air pressure in one or more of your
tires is at least 20% lower than the recommended cold tire pressure. This recommended pressure should be displayed on the Tire and Loading information label.
See Maintaining Tire Pressures on page 164 for detailed
information on how to keep the tires properly
inflated.
This alert may appear in cold weather because the tire pressure decreases when cold.
Page 227 of 232

F
factory defaults, restoring: 124
factory reset: 124
fan speed, interior: 125
favorites (Media Player): 136
Favorites (navigation): 131
FCC certifications: 202
features, downloading new: 149
firmware (software) updates: 149
flash drives, playing audio files from: 136
flashers, warning: 55
floor mats: 172
fluids: 162, 174
replacement intervals: 162
reservoirs, checking: 174
fog lights: 53
forward collision warning: 114
front passenger detection: 39
front trunk: 18
G
garage doors, opening: 146
gates, opening: 146
GAWR: 179
gears: 51
glovebox: 21
Glovebox PIN: 142
Gross Axle Weight Rating: 179
Gross Vehicle Weight Rating: 179
ground clearance: 181
GVWR: 179
H
hazard warning flashers: 55
head supports: 27
headlights: 53, 54
after exit: 54
controlling: 53
high beams: 54
heating: 125
high beam headlights: 54
high voltage: 154, 162, 185
Battery specifications: 185
components: 154
safety: 162
hills, stopping on: 66
Home location: 133
HomeLink: 105, 146
programming and using: 146
when using Summon: 105
hood: 18
horn: 47
hub caps: 166
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