DPB family
DPB_a074_rotorCosOutOfRangeLow
Power braking assist reduced
What does the DPB_a074_rotorCosOutOfRangeLow alert mean?
The rotation position sensor reports a lower Cos+ or Cos- value than expected.
What you'll see in your Tesla
- Power braking assist reduced
- Braking may require increased effort
What triggers it
The rotation position sensor is shorted to ground. Raw analog-to-digital converter values are read to detect this condition.
When it clears
ignition on wait 5 s
Potential impact
System will be running in fully degraded state. Braking may require increased effort. Hydraulic Boost Compensation will be triggered when driver pressed brake pedal.
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.