MODEL S ALERT CODES
A Diagnostic Trouble Code (DTC) is an alphanumeric identifier for a fault condition identified by the On Board Diagnostic System (SAE j1930 v003). Tesla's diagnostic process does not generally rely on DTCs, however, and instead relies on event based troubleshooting via 'alerts.'
An alert is how the electronic control unit (ECU) denotes and records an event of interest. This can include faults, abnormal behavior, normal behavior, a particular use case (shift with foot off brake, driving with door open, etc.), and many other events. The key distinction is that Tesla alerts are event based troubleshooting as opposed to fault condition based troubleshooting.
Alerts can also trigger behaviors and/or messages on the User Interface (UI) to communicate with the driver in special circumstances where Tesla wants the driver to perform an action as a result of the event. For example, if the vehicle detects that the hood is unlatched, it can alert the driver that the hood is unlatched in addition to a traditional telltale. The UI may display a telltale, make a sound, change the UI, or display a message, depending on the UI behavior associated with the alert (if any).
Note: Some alerts apply only to certain vehicles, configurations, or markets. These alerts correspond to firmware version 2017.48.8. Alerts are subject to change as firmware versions change. New firmware versions are released regularly, and not all customer vehicles receive updates at the same time. Thus, no single firmware version will correspond to all customer vehicles at any given time.
| Signal Name | APP_w009_aebFault |
|---|---|
| Shown to Customer | True |
| Debug Text | APP_w009_aebFault |
| User Message | Automatic Emergency Braking Is Disabled: |
| Chime / Notification Behavior | • Behavior Name: CLUSTER_NO_CHIME • Shown on Cluster: False • Sound Repeated: False • Sound Name: ALERT_SOUND_NONE • Icon Type: ALERT_ICON_WARNING |
Table Caption: This table describes a fault in the Automatic Emergency Braking (AEB) system, indicating that the fault is shown to the customer with a specific user message and no audible chime or warning icon. The debug text for this fault is APP_w009_aebFault.
| Signal Name | APP_w225_lcDegradedVisSpeedLmt |
|---|---|
| Shown to Customer | True |
| Debug Text | APP_w225_lcDegradedVisSpeedLmt |
| User Message | Autosteer Max Speed Is Limited: Contact Tesla Service for Manual Calibration |
| Chime / Notification Behavior | • Behavior Name: CLUSTER_SINGLE_CHIME • Shown on Cluster: False • Sound Repeated: False • Sound Name: ALERT_SOUND_CHIME • Icon Type: ALERT_ICON_WARNING |
Table Caption: This table describes a vehicle signal named "APP_w225_lcDegradedVisSpeedLmt" which, when active and shown to the customer, displays a user message indicating that the autosteer maximum speed is limited and advises contacting Tesla Service for manual calibration, accompanied by a single cluster chime.
**Table Caption: This table describes the "BMS_f001_HW_Over_Current" signal, indicating it's visible to the customer and triggers a
