2020 TESLA MODEL Y wiring

The towing package includes a 2" x 2" (5 cm x 5 cm)
hitch receiver that can support an accessory carrier (for bicycles, skis, snowboards, etc.) or tow a trailer.
Installing and Using a Carrier
When using the tow package to carry accessories, the 2"
x 2" (5 cm x 5 cm) square hitch receiver is designed to
support vertical loads of up to
160 lbs (72 kg). Ball
mounts that are compatible with the square receiver
must be purchased separately.
To install and use an accessory carrier, you must first
attach the ball mount to the hitch receiver (see
Attaching and Removing the Ball Mount on page 76).
Then, follow the instructions provided by your accessory
carrier. Observe all regulations and legal requirements in your state or region that apply to carrying accessories.
The Model Y towing package includes the wiring
necessary for using an accessory carrier equipped with lights (see
Electrical Connections on page 77). The
package also includes Trailer Mode software compatibility (see
Trailer Mode on page 75).
NOTE: Go to http://www.tesla.com to purchase
accessories for your vehicle. Although third-party products are available, Tesla recommends and supports
only Tesla-approved products (see
Parts and
Accessories on page 177). The accessory products
available for your vehicle may vary based on market
region. Before attempting to install a non Tesla-
approved carrier, review the product information to ensure compatibility.
NOTE: When not in use, the ball mount should be
removed and stored in a dry location to prevent dust and corrosion. Keep the dust cover over the hitch housing to prevent dirt and debris from entering (see
Attaching and Removing the Ball Mount on page 76).
NOTE: Tesla assumes no responsibility for damage or
injuries resulting from installing and using an accessory carrier, for any omissions in the instructions accompanying an accessory carrier, or for your failure to follow the instructions. Damage caused by using an accessory carrier is not covered by the warranty.
Carrying Accessories
The hitch receiver is designed to support vertical loads
up to
160 lbs (72 kg). When carrying bicycles, skis, or
other items on the
Model Y hitch, always check to
ensure that the maximum weight is not exceeded. When calculating weight, remember to include the weight of
the accessory carrier.
For example, assuming the carrier
weighs 40 lbs (18 kg), the weight threshold is su

To attach a ball mount:
1.
Remove the dust cover from the hitch housing by using a small object, such as a
flat screwdriver, to pry
between the dust cover and hitch housing. Store the dust cover in a secure location.
2.
If necessary, remove the cotter pin from the locking
bolt and slide the locking bolt out of the hitch assembly.
3.
Slide the ball holder into the hitch assembly.
4.
Align the hole in the ball holder with the one in the hitch assembly.
5.
Slide the locking bolt through the hitch assembly/ball holder.
6.
Insert the cotter pin in the hole at the end of the
locking bolt.
To remove a ball mount:
1.
Remove the cotter pin from the locking bolt and slide
the locking bolt out of the ball holder/hitch assembly.
2. Pull the ball holder out of the hitch assembly.3.
Re-install the dust cover for the hitch housing and
store the ball mount in a secure location.
Electrical Connections
Regulations require all trailers to be equipped with tail lights, brake lights, side marker lights, and turn signals.
To provide power for trailer lighting, a built-in 7-pin
wiring connector is provided near the hitch support

NOTE: Loss of trailer lights when towing may be the
result of a fault in the trailer wiring or excessive power
consumption by the lights connected to the trailer output(s). When this occurs, a Trailer Mode icon
appears on the touchscreen. Fix any issues with the wiring and/or reduce the number of lights connected to the trailer output(s), then toggle Trailer Mode
off and
on again.
CAUTION: Always ensure that the trailer electrical
cable does not contact or drag on the ground and
there is enough slack in the cable to allow for
turns.
WARNING: Use only the electrical connections
designed by Tesla. Do not attempt to directly
splice or attempt to connect a trailer’s electrical
wiring using any other method. Doing so can
damage the vehicle

2. Self-test of internal ground fault monitoring circuit failed3.
Thermal sensor disconnected
4.
Other hardware component issues
What to do:
An internal issue was detected by the Wall Connector.
1.
Try charging again by disconnecting the Wall Connector from the vehicle and reconnecting.
2.
If the issue persists, turn OFF the circuit breaker for
the Wall Connector, wait 10 seconds, and turn the circuit breaker ON again. Then try reconnecting the Wall Connector to the vehicle.
3.
If the issue persists, check for loose connections.
a.
Make sure there is no power to the Wall
Connector.
b.
Remove the face plate and inspect the wiring
terminals for any loose connections.
c.
Contact an electrician if necessary to make sure all
wires are properly connected and torqued according to the instructions in the Wall Connector Installation Manual.
4.
Once all connections have been checked and made
secure, restore power to the Wall Connector and try charging again by reconnecting to the vehicle.
5.
If the issue persists, the Wall Connector needs service. Schedule a service appointment through
your Mobile App.
(CC_a005)
Unable to charge - Wall Connector
GFCI tripped
Disconnect and retry or use
different equipment
What this alert means:
Ground fault. Current is leaking through an unsafe path.
Possible Line to ground or Neutral to ground fault.
What to do:
Try again by disconnecting the Wall Connector from the
vehicle and reconnecting. If the problem persists, turn
OFF the circuit breaker servicing the Wall Connector,
wait 10 seconds, turn the circuit breaker ON again, then
try reconnecting the Wall Connector to the vehicle. If the
problem persists, contact Tesla.
(CC_a006)
Unable to charge

Input miswired: possibly Line and Neutral are swapped.
What to do:
The wiring between the wall power and the Wall
Connector has been incorrectly installed. Consult your
electrician.
(CC_a010)
Unable to charge

(PCS_a054)
Unable to charge
Check for an extension cord or bad
utility wiring
Charging has been interrupted because the onboard
charger in your vehicle has detected an unusually large voltage drop.
Likely causes of this issue include:

(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.