DPB family
DPB_a226_U5VTestFault
Power braking assist reduced
What does the DPB_a226_U5VTestFault alert mean?
U5V voltage comparator test failed.
What you'll see in your Tesla
- Power braking assist reduced
- Braking may require increased effort
What triggers it
Defect of ASIC, Test starts and evalutes the ASIC internal test of the U5V voltage regulator.
When it clears
No internal issue is detected after changing operation cycle. If the condition persists, the DPB module may require replacement.
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+
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