PPB family
PPB_a015_trailerLowSideSwitchFault
Parking brake functions degraded
What does the PPB_a015_trailerLowSideSwitchFault alert mean?
Low side trailer switch short or open circuit detected - Internal to Hardware.
What you'll see in your Tesla
- Parking brake functions degraded
- Parking brake may not apply or release
What triggers it
Hardware issue detected with the trailer low side switch
When it clears
Reseting the ECU may clear the alert, otherwise replacement may be required
Potential impact
Loss of trailer functionality
Affected models
Semitruck
Track your Tesla's alerts automatically
Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.