DPB family
DPB_a259_valveRelayTestUndervoltage
Power braking assist reduced
What does the DPB_a259_valveRelayTestUndervoltage alert mean?
Conditions for valve relay switch on test not correct.
What you'll see in your Tesla
- Power braking assist reduced
- Braking may require increased effort
What triggers it
Voltage conditions (valve supply) for initial valve relay safety test is not correct. Test if the VR can be switched off by safety logic.
When it clears
PowerOn Wait7s
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.