DPB family
DPB_a015_CAN1BusOff
Power braking assist reduced
What does the DPB_a015_CAN1BusOff alert mean?
First CAN bus is detected as OFF.
What you'll see in your Tesla
- Power braking assist reduced
- Braking may require increased effort
What triggers it
Short circuit between CAN + and CAN- or short circuit between CAN + and Ubatt or heavy bus disturbance. The bus-off recovery state machine of the CAN network has detected a certain amount of sequential bus-offs without successful recovery.
When it clears
Proper CAN communication
Potential impact
System will be running with internal degraded pedal map. Braking may require increased effort.
Affected models
Model Y 2025+
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.