IDB_a003_supplyHardOvervoltage
Power braking assist reduced
What does the IDB_a003_supplyHardOvervoltage alert mean?
The Integrated Dynamic Brake (IDB) reports a high power supply voltage.
What you'll see in your Tesla
- Power braking assist reduced
- Braking may require increased effort
What triggers it
Power supply voltage is greater than 19V for 500 milliseconds.
When it clears
Power supply voltage is less than 18V for 500 milliseconds.
Potential impact
The IDB enters fallback mode and relinquishes controlling status to the Redundant Control Unit (RCU). The RCU may assume controlling status and perform backup brake boost, but Electronic Brake Distribution (EBD), Anti-lock Brake System (ABS), Brake Traction Control (BTC), Vehicle Dynamics Control (VDC), Panic Brake Assist (PBA), Hydraulic Fade Compensation (HFC), Controlled Deceleration via Parking brake (CDP), Brake Disc Wipe (BDW), External Brake Request (EBR), and Secondary Collision Mitigation (SCM) may be unavailable. Increased braking effort may be necessary to achieve desired deceleration. The vehicle should be driven with extreme caution.
Affected models
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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.