APS-W021
APS_w021_ECU_Temperature_Issue
Also written as APS_W021 / APS W021 / APS_w021_ECU_Temperature_Issue / aps_w021_ecu_temperature_issue
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does APS-W021 mean?
Tesla warning code in the Autopilot System (APS) module. ECU temperature out of nominal range APS monitors the temperature sensor and alerts when temperature exceeds nominal range Clears when temperature returns to nominal range System may shut down to prevent part damage. AP features will be unavailable Warns if APS fails to receive one or more CAN msgs from VCLEFT on Party Bus APS fails to receive one or more CAN msgs from VCLEFT on Party Bus
Original Description
ECU temperature out of nominal range APS monitors the temperature sensor and alerts when temperature exceeds nominal range Clears when temperature returns to nominal range System may shut down to prevent part damage. AP features will be unavailable Warns if APS fails to receive one or more CAN msgs from VCLEFT on Party Bus APS fails to receive one or more CAN msgs from VCLEFT on Party Bus
Affected Tesla Models
What You May Notice
- Autopilot System alert: ECU temperature out of nominal range APS monitors the temperature sensor and alerts when temperature exceeds nominal ran
- Camera or sensor obstruction notification on the touchscreen
- Autopilot features greyed out in the drive settings menu
How to Diagnose and Resolve
- 1 Check all cameras and sensors for dirt, ice, or obstructions — clean if needed
- 2 Reboot the vehicle
- 3 Check for OTA updates (Autopilot improvements are frequently delivered OTA)
- 4 Schedule service if Autopilot remains unavailable after cleaning and rebooting
Severity Notes
APS-W021 is a Warning in the Autopilot System system. Schedule service soon. Monitor your vehicle for additional warnings.