2026-09-03

Battery - Auxiliary - 12V (Remove and Replace)

Correction Code 17011212 Correction Code 17011252 Correction Code 17011302

  • 2026-09-03: Added steps of the underhood aprons and the HVAC filter housing for the 1st generation vehicles.
  • 2024-11-20: Added a note to remind of checking the 12V/LV battery temperature before performing the procedure.
  • 2023-10-19: Added battery type configuration using the touchscreen.
Choose the appropriate procedure based on the vehicle's configuration and date of manufacture:
Warning
Before performing the following procedure, make sure the 12V/LV battery temperature is not overheated.
Warning
If the 12V power supply is disconnected, do not attempt to open any doors with door glass in closed position. Failure to follow this instruction could result in door glass shatter.
Note
Before disconnecting the 12V power supply, ensure that the driver’s door window is fully open. Failure to follow this instruction could result in vehicle lockout.

1st Generation RWD

Correction Code 17011212

Removal

  1. Remove the LH and RH underhood aprons. See Underhood Apron - LH (Remove and Replace).
  2. Disconnect 12V power. See Disconnect 12V Power.
  3. Remove the nuts (x4) that secure the rear HVAC filter housing and rubber HVAC intake drain diverter.
    6 Nm (4.4 lbs-ft)
    Tip
    Use of the following tool(s) is recommended:
    • 10 mm socket
  4. Battery top-mounted fuse box only:
    1. Release the lugs (x4) that attach the battery fuse box cover to the fuse box. Remove the cover.
    2. Remove the nut that attaches the battery positive terminal to the fuse box (torque 10 Nm).
      Note
      The thread pitch of this nut is specific to the battery terminal, and this nut should be kept separate from other 13 mm nuts, such as the one removed in the previous step.
    3. Remove the nut that attaches the body harness connector to the battery fuse box (torque 12 Nm).
    4. Remove and discard the nut (1011844-00-A) that attaches the battery fuse box to the battery strap. Tie the battery fuse box aside (torque 5 Nm).
    5. Remove and discard the nuts (x2) that attach the battery strap (torque 3.5 Nm). Swing the strap out of way and remove it from the J-hook.
  5. Without battery top-mounted fuse box:
    1. Disconnect the 12V positive terminal clamp from the 12V battery (torque 6 Nm).
    2. Remove the nuts (x2) that attach the battery strap (torque 5 Nm). Remove the strap.
  6. Carefully lift the 12V battery and remove it.
    Note
    It can be difficult to remove the Model S AGM batteries because they do not have handles. It might be helpful to use duct tape in order to lift the battery high enough so that it can be supported from the bottom:
    1. Cut a piece of high-strength duct tape, approximately 18 in (45 cm) in length.
    2. Attach the ends of the duct tape to the long sides of the battery, leaving a large section of duct tape free above the battery. Twist this section of the duct tape back onto itself in order to form a handle.
    3. Using the handle, slowly lift the battery until it can be supported from the bottom.
      Warning
      Do not use the handle to fully lift the battery out of the vehicle. Only lift the battery high enough so that it can be supported from the bottom.
  7. Write the last 6 digits of the vehicle VIN clearly onto the removed battery so that it can be identified later if needed.

Installation

Installation procedure is the reverse of removal, except for the following:
CAUTION
Before installing the new battery, make sure that the new battery's Open Circuit Voltage (OCV) is above 12.6V. If the OCV is between 12.4V and 12.6V, recharge the new battery. Any battery below 12.4V must be discarded.
  1. If a different type of battery is installed than originally installed, the "12V Battery Type" configuration must be updated. If no configuration update is required, discontinue this procedure.
    Note
    If a configuration update is required, separately add Correction Code 91022407 (Vehicle Configuration Update) to the Service Visit.
    • For vehicles operating with software version 2023.20 or later, go to step 2.
    • For vehicles operating with software version earlier than 2023.20, continue with the next step.
    1. Connect a laptop to the diagnostic port of the vehicle, and then use Toolbox 3 to locally connect to the vehicle. See Toolbox 3 (Connect and Disconnect).
    2. Unlock the vehicle gateway. See Gateway Unlock.
    3. Update the vehicle's gateway "12VBatteryType" configuration parameter to the following values corresponding to the battery installed. See Gateway Configuration (Display and Change).
      • C&D DCS-33RIT (red case, red lid): C&D
      • C&D DCS-33UNCR (black case, red lid or black case, gray lid): C&D Nano Carbon
        Note
        A configuration update is not required when switching from a red lid battery to a gray lid battery.
      • AtlasBX AGM U1LS (black case, yellow lid): Atlas U1 AGM
        Note
        This battery can also be physically labeled as "Hankook".
    4. Disconnect the laptop with Toolbox 3 from the vehicle. See Toolbox 3 (Connect and Disconnect).
    5. Discontinue this procedure: no need to continue to the next step.
  2. Use the touchscreen to update the vehicle's gateway "12V Battery Type".
    1. Unlock the vehicle gateway. See Gateway Unlock.
    2. In the Service Mode menu, go to Low Voltage > LV Battery Type > Change Battery Type to Selected.
    3. Select the type of battery that was installed, and then touch Change Battery Type to Selected.
    4. Read the prompt, touch Run, and allow the routine to complete.

1st Generation Dual Motor

Correction Code 17011252

Removal

CAUTION
Very early production models may have the battery and battery top-mounted fuse box layout as found on 1st Generation RWD vehicles. Refer to 1st Generation RWD for instructions. Do not perform any work on the fuse box if the battery is not located under the fuse box.
  1. Disconnect 12V power. See Disconnect 12V Power.
  2. Disconnect the 12V positive terminal clamp from the 12V battery (torque 6 Nm).
  3. Remove the nuts (x2) and bolt (x1) that attach the battery strap (torque 5 Nm). Remove the strap.
  4. Remove the battery from the tray.
  5. Write the last 6 digits of the vehicle VIN clearly onto the removed battery so that it can be identified later if needed.

Installation

Installation procedure is the reverse of removal, except for the following:
CAUTION
Before installing the new battery, make sure that the new battery's Open Circuit Voltage (OCV) is above 12.6V. If the OCV is between 12.4V and 12.6V, recharge the new battery. Any battery below 12.4V must be discarded.
  1. If a different type of battery is installed than originally installed, the "12V Battery Type" configuration must be updated. If no configuration update is required, discontinue this procedure.
    Note
    If a configuration update is required, separately add Correction Code 91022407 (Vehicle Configuration Update) to the Service Visit.
    • For vehicles operating with software version 2023.20 or later, go to step 2.
    • For vehicles operating with software version earlier than 2023.20, continue wit the next step.
    1. Connect a laptop to the diagnostic port of the vehicle, and then use Toolbox 3 to locally connect to the vehicle. See Toolbox 3 (Connect and Disconnect).
    2. Unlock the vehicle gateway. See Gateway Unlock.
    3. Update the vehicle's gateway "12VBatteryType" configuration parameter to the following values corresponding to the battery installed. See Gateway Configuration (Display and Change).
      • C&D DCS-33RIT (red case, red lid): C&D
      • C&D DCS-33UNCR (black case, red lid or black case, gray lid): C&D Nano Carbon
        Note
        A configuration update is not required when switching from a red lid battery to a gray lid battery.
      • AtlasBX AGM U1LS (black case, yellow lid): Atlas U1 AGM
        Note
        This battery can also be physically labeled as "Hankook".
    4. Disconnect the laptop with Toolbox 3 from the vehicle. See Toolbox 3 (Connect and Disconnect).
    5. Discontinue this procedure: no need to continue to the next step.
  2. Use the touchscreen to update the vehicle's gateway "12V Battery Type".
    1. Unlock the vehicle gateway. See Gateway Unlock.
    2. In the Service Mode menu, go to Low Voltage > LV Battery Type > Change Battery Type to Selected.
    3. Select the type of battery that was installed, and then touch Change Battery Type to Selected.
    4. Read the prompt, touch Run, and allow the routine to complete.

2nd Generation

Correction Code 17011302

Removal

  1. Disconnect 12V power. See Disconnect 12V Power.
  2. Disconnect the 12V positive terminal clamp from the 12V battery (torque 6 Nm).
  3. Remove the underhood storage unit. See Underhood Storage Unit (Remove and Install).
  4. Remove the nuts (x2) and bolt (x1) that attach the battery strap to the battery (torque 5 Nm). Remove the strap.
  5. Remove the battery from the tray.
  6. Write the last 6 digits of the vehicle VIN clearly onto the removed battery so that it can be identified later if needed.

Installation

Installation procedure is the reverse of removal, except for the following:

CAUTION
Before installing the new battery, make sure that the new battery's Open Circuit Voltage (OCV) is above 12.6V. If the OCV is between 12.4V and 12.6V, recharge the new battery. Any battery below 12.4V must be discarded.
  1. If a different type of battery is installed than originally installed, the "12V Battery Type" configuration must be updated. If no configuration update is required, discontinue this procedure.
    Note
    If a configuration update is required, separately add Correction Code 91022407 (Vehicle Configuration Update) to the Service Visit.
    • For vehicles operating with software version 2023.20 or later, go to step 2.
    • For vehicles operating with software version earlier than 2023.20, continue wit the next step.
    1. Connect a laptop to the diagnostic port of the vehicle, and then use Toolbox 3 to locally connect to the vehicle. See Toolbox 3 (Connect and Disconnect).
    2. Unlock the vehicle gateway. See Gateway Unlock.
    3. Update the vehicle's gateway "12VBatteryType" configuration parameter to the following values corresponding to the battery installed. See Gateway Configuration (Display and Change).
      • C&D DCS-33RIT (red case, red lid): C&D
      • C&D DCS-33UNCR (black case, red lid or black case, gray lid): C&D Nano Carbon
        Note
        A configuration update is not required when switching from a red lid battery to a gray lid battery.
      • AtlasBX AGM U1LS (black case, yellow lid): Atlas U1 AGM
        Note
        This battery can also be physically labeled as "Hankook".
    4. Disconnect the laptop with Toolbox 3 from the vehicle. See Toolbox 3 (Connect and Disconnect).
    5. Discontinue this procedure: no need to continue to the next step.
  2. Use the touchscreen to update the vehicle's gateway "12V Battery Type".
    1. Unlock the vehicle gateway. See Gateway Unlock.
    2. In the Service Mode menu, go to Low Voltage > LV Battery Type > Change Battery Type to Selected.
    3. Select the type of battery that was installed, and then touch Change Battery Type to Selected.
    4. Read the prompt, touch Run, and allow the routine to complete.