Replace the brake light switch on a 2024 Tesla Model Y Long Range AWD. The switch is mounted to the brake pedal bracket under the driver's dash and is a low-voltage component, but standard Tesla HV precautions still apply.

Warnings

Tools required

Parts

• Brake light / brake pedal position switch × 1 — Manufacturer-specified Tesla Model 3/Y brake pedal switch — verify by VIN

Preparation

1. Park on level ground, place in P, and engage the parking brake.
2. Exit ALL doors with the key fob away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the 12V low-voltage battery. On the 2024 Model Y, the 12V (lithium-ion) battery is accessed in the front trunk area under a service cover — refer to the Tesla Owner's Manual section on '12V battery' for exact access on your build.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Move the driver's seat fully rearward and tilt the steering wheel up to maximize footwell access.
7. Have the replacement brake light switch on hand and confirm it matches the part removed (some Model 3/Y switches differ by build date).

Procedure

1. 1

   Access the driver's footwell
   Lie on your back in the driver's footwell with a headlamp aimed up at the brake pedal assembly. Locate the brake pedal arm and trace it upward to the pedal mounting bracket where the switch is installed (typically on the upper bracket, behind the pedal arm).
2. 2

   Identify the brake light switch
   The brake light switch is a small plastic plunger-style switch threaded or clipped into the brake pedal bracket. It has a small electrical connector (typically 2–4 pins) and a plunger that contacts a tab on the pedal arm. Confirm visually before disturbing any other component.
   ⚠Do not confuse the brake light switch with the brake pedal position sensor (if separately equipped). Replacing the wrong part will not resolve brake light faults and may set additional DTCs.
3. 3

   Disconnect the electrical connector
   Depress the locking tab on the switch's electrical connector and gently pull it straight off. Do not pry on the wires. Inspect the connector pins for corrosion or backed-out terminals before proceeding.
4. 4

   Remove the old switch
   Most Tesla Model 3/Y brake light switches are a quarter-turn / push-and-rotate retention design seated in the pedal bracket. Depress the pedal slightly by hand to relieve plunger pressure, then rotate the switch counterclockwise (typically ~1/8 to 1/4 turn) and withdraw it from the bracket. If the switch uses a different retention method on your build, refer to the Tesla Service Manual rather than forcing it.
   ⚠Do not pry the switch out with metal tools — the plastic body and the bracket tabs break easily. Use only hand pressure or a plastic trim tool.
5. 5

   Compare old and new switches
   Place the old and new switches side-by-side. Verify identical body shape, plunger length, connector keying, and pin count. A mismatched plunger length will either keep the brake lights on continuously or fail to trigger them at all.
6. 6

   Install the new switch
   With the brake pedal slightly depressed by hand (so the plunger is not preloaded against the pedal tab), insert the new switch into the bracket. Rotate clockwise to lock per the manufacturer's retention design. Slowly release the pedal and confirm the plunger seats against the pedal tab without the pedal being pushed off its rest position.
   ⚠If the switch self-adjusts (ratcheting plunger), follow the manufacturer's procedure exactly — typically: install with pedal depressed, then release pedal once to auto-set plunger depth. Do not cycle the pedal before this is complete.
7. 7

   Reconnect the electrical connector
   Push the connector straight onto the switch until the locking tab clicks. Tug gently to confirm it is fully seated.

Reassembly

1. Verify no tools, fasteners, or trim clips are left in the footwell.
2. Reconnect the 12V low-voltage battery. Torque the 12V terminal hardware to OEM specification — refer to Tesla Service Manual.
3. Close the frunk and all doors. Allow the vehicle 2–3 minutes after 12V reconnection for systems to fully boot before testing.

Verification

• With the vehicle awake but in P, have a helper observe the rear brake lights (and high-mount center stop lamp) while you press and release the brake pedal. Lights must come on immediately when pedal moves and turn off completely when pedal is fully released — no flicker, no stuck-on condition.
• Confirm no 'Service Vehicle Soon', 'Brake System' or regen-related alerts appear on the touchscreen after a full power cycle.
• Shift out of P: the vehicle requires a valid brake-pedal signal to leave Park. If it refuses to shift out of P with the brake firmly pressed, the switch is misaligned or wrong part — recheck immediately.
• Test regenerative braking on a short drive: lifting off the accelerator should engage regen and illuminate brake lights as expected (Tesla uses the brake light switch plus regen logic to command rear lamps). No regen, or regen without brake lamp activation under heavy lift-off, indicates a switch issue.
• Note: While unrelated to this job, Tesla recommends brake fluid service every 2 years regardless of mileage — check service history and advise the owner if due.

More procedures for this vehicle