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.
2012 Tesla Model SFACTORY OEM SERVICE PROCEDURE
Test Procedure
- 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) .
- Enable Service Mode through the touchscreen. See Service Mode .
- On the vehicle touchscreen, touch CAN Viewer
and select the signals STW_ANGLHP_STAT > StW_AnglHP
and EPAS_sysStatus > EPAS_torsionBarTorque
.NOTE: STW_ANGLHP_STAT > StW_AnglHP can be found under CH bus. EPAS_sysStatus > EPAS_torsionBarTorque can be found under CH bus on Intel MCU's, and under ETH bus on Tegra MCU's.
- Turn the steering to the left lock stop and hold the EPAS_torsionBarTorque value at 10 N.m while reading the angle. Record this value.
- Turn the steering to the right lock stop and hold the EPAS_torsionBarTorque value at 10 N.m while reading the angle. Record this value.
- If the two angle values are more than 6 degrees apart, center the steering wheel. See Steering Wheel (Remove And Replace) .
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.