Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Firmware Redeploy (Lead Acid Battery)
2018 Tesla Model 3 BaseSECTION Firmware Redeploy (Lead Acid Battery)
- Remove the rear underhood apron. See UNDERHOOD APRON - REAR (REMOVE AND REPLACE) .
- Connect a 12V support charger to make sure power is not lost during the firmware redeploy.CAUTION: If using a 50A or 80A maintainer, make sure the maintainer is set to "Lead Acid" or "Half Power" mode. Failure to do so could damage the LV battery.
- Connect a laptop with Toolbox 3 to the vehicle. See Toolbox 3 (Connect and Disconnect) NOTE: Locally connecting the vehicle to Toolbox 3 will automatically enable Service Mode Plus.
- In Toolbox, select the Actions/Autodiag tab, and then search for "redeploy".
- Run the appropriate routine and wait for the reinstallation to complete. Reinstallation status can be monitored on the vehicle touchscreen.
- Service CAN Redeploy (UPDATE_CAN-REDEPLOY) - A "partial" software reinstallation that reinstalls the currently installed software package to all module, ECU, and component replacements, with the exception of the car computer.
- Service Redeploy (UPDATE_SERVICE-REDEPLOY) - A "full" software reinstallation that reinstalls the currently installed software package to the car computer, and all module, ECU, and component replacements.
- Once the reinstallation is complete, check that the release notes appear on the touchscreen, indicating a successful reinstallation.
- Disconnect the 12V support charger.Disconnect the LV battery maintainer.
- Disconnect the laptop from the vehicle. See Toolbox 3 (Connect and Disconnect)
- Disable Service Mode. See SERVICE MODE .
- Install the rear underhood apron. See UNDERHOOD APRON - REAR (REMOVE AND REPLACE) .
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.