2018 Tesla Model S 100DFACTORY OEM SERVICE PROCEDURE

Alert Code: TAS_w127_maxDutyBoost

Signal Name TAS_w127_maxDutyBoost
Shown to Customer True
Debug Text TAS_w127_maxDutyBoost
User Message Air Suspension Temporarily Unavailable:
Chime/Notification Behavior
  • Behavior Name: CLUSTER_SINGLE_CHIME_NOTIFICATION
  • Shown on Cluster: False
  • Sound Repeated: False
  • Sound Name: ALERT_SOUND_CHIME
  • Icon Type: ALERT_ICON_NOTIFICATION
Intent To indicate the boost valve has reached its duty-cycle (on-time) limit.
Set Condition The boost valve reaches its duty-cycle limit.
Clear Condition The boost valve duty-cycle drop below a separate duty-cycle limit.


Signal Name TAS_w127_maxDutyBoost
Potential Impact The boost valve is temporarily unavailable. This prevents the boost feature of the air suspension from operating.
Factory Service Tools

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When to See a Mechanic

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  • • 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.

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