Replace the brake light switch on a 2024 Tesla Cybertruck Dual Motor. The switch is mounted to the brake pedal bracket under the driver-side dash and detects pedal travel to trigger brake lamps and various vehicle systems.

Warnings

Tools required

Parts

• Brake light switch (Cybertruck-specific) × 1 — OEM Tesla Cybertruck brake pedal position/light switch — verify against VIN

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with the key fob/phone key 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 48V low-voltage battery (Cybertruck uses a 48V LV architecture — NOT 12V). Refer to the Tesla Service Manual for exact LV battery location and disconnect procedure on Cybertruck.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage (800V on Cybertruck) 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 recline for access to the pedal box.
7. Have a flashlight ready — the brake light switch sits high on the pedal bracket in a tight footwell area.

Procedure

1. 1

   Confirm the failure mode
   Before replacement, confirm the brake light switch is the actual fault. Check for stored fault codes related to brake pedal position/switch via the vehicle's service interface. Symptoms include brake lights inoperative or always-on, inability to shift out of P, cruise/Autopilot disengagement faults, or regen behavior anomalies.
2. 2

   Verify LV battery is disconnected
   Confirm the 48V LV battery negative terminal is disconnected and isolated. Test that interior lights and door modules are dead before proceeding. This prevents shorting the switch harness during removal.
   ⚠48V can produce a stronger arc than 12V. Insulate the disconnected terminal so it cannot contact chassis ground.
3. 3

   Access the pedal box area
   From the driver's footwell, remove any lower dash trim or knee bolster panel necessary to expose the brake pedal bracket and the upper portion of the brake pedal arm. Use plastic trim tools to release clips. Set fasteners aside in order.
   ⚠Cybertruck interior trim uses a mix of clips and threaded fasteners; do not force panels — a hidden fastener is likely present.
4. 4

   Locate the brake light switch
   Identify the brake light switch mounted to the pedal support bracket above the brake pedal arm. The switch body has an electrical connector (typically 2–4 pin) and is held in place by a quarter-turn locking collar or a clip-style retainer (verify against the Tesla Service Manual for Cybertruck-specific design).
5. 5

   Disconnect the switch electrical connector
   Depress the connector locking tab and gently separate the harness from the switch. Inspect the connector for corrosion, bent pins, or melted plastic — these can indicate a wiring fault rather than a switch fault.
   ℹ️If the connector is damaged, replacing only the switch will not solve the problem — repair the harness side as well.
6. 6

   Remove the brake light switch
   Following the manufacturer-specified retention method (typically a quarter-turn rotation to unlock, or a release tab to depress), remove the switch from the pedal bracket. Do not pull on the plunger or strike the switch body. Once free, withdraw the switch from the bracket.
   ⚠Do not press the brake pedal while the switch is removed — uncontrolled pedal travel may damage the brake pedal position sensor or pedal stop.
7. 7

   Compare old and new switch
   Place the old and new switch side-by-side. Confirm identical body shape, connector keying, plunger geometry, and any pre-set self-adjusting plunger position. A mismatched switch will either trigger constant brake lights or fail to trigger at all.
8. 8

   Install the new brake light switch
   Install per the Tesla Service Manual. Many self-adjusting brake light switches require the pedal to be fully released (at rest against its upper stop) at the moment the switch is installed and locked, so the internal plunger sets to the correct length. Insert the switch into the bracket, rotate or clip per design, and confirm it is fully seated and locked.
   ⚠Do NOT depress the brake pedal during switch installation if it is a self-adjusting type — this will set incorrect calibration and cause permanent-on or permanent-off brake lights.
9. 9

   Reconnect the electrical connector
   Plug the harness connector firmly into the new switch until the locking tab clicks. Verify the connector is fully seated and the lock is engaged.
10. 10

    Reinstall trim
    Reinstall the knee bolster / lower dash trim. Ensure all clips seat fully and any threaded fasteners are torqued to OEM specification — refer to Tesla Service Manual. Do not pinch any wiring during reinstallation.
11. 11

    Reconnect the 48V LV battery
    Reconnect the 48V LV battery negative terminal. Torque to OEM specification — refer to Tesla Service Manual. Allow the vehicle to wake and complete its boot-up sequence before testing.
    ⚠Expect a momentary inrush spark on reconnection — this is normal for 48V systems but ensure no tools or jewelry are near the terminal.

Reassembly

1. Confirm all dash trim panels are flush and fully clipped.
2. Reset the driver's seat to the user's preferred position.
3. Allow the vehicle to fully wake (touchscreen on, HVAC available) before driving.
4. Re-initialize windows if they auto-up/down behavior is lost (window calibration procedure per Tesla Service Manual).

Verification

• With the vehicle awake and a second person observing the rear of the truck (or using a reflection), press the brake pedal and confirm all brake lamps and the CHMSL illuminate immediately, and extinguish promptly when released.
• Confirm the vehicle can be shifted out of Park (brake-shift interlock requires a working brake switch signal).
• Engage and disengage Traffic-Aware Cruise Control / Autopilot on a safe road and verify the system disengages instantly when the brake pedal is pressed.
• Verify regen-blended braking feels normal — abnormal switch input can alter blended braking behavior.
• Scan for stored brake-switch-related fault codes via the vehicle's service interface; clear and confirm none return after a short drive.
• Note: While here, confirm the customer's brake fluid service is current — Tesla recommends brake fluid replacement every 2 years regardless of mileage.

More procedures for this vehicle