DI family
DI_a023_carNotParked
Parking brake not applied
What does the DI_a023_carNotParked alert mean?
The drive interface (DI) electronic control unit (ECU) detects that the electronic park brake (EPC) ECU is missing (MIA) and as a result cannot honor the park request.
What you'll see in your Tesla
- Parking brake not applied
- Vehicle may free roll
What triggers it
The DI ECU does not receive the expected CAN messages from the EPB ECU.
When it clears
The DI ECU receives the expected controller area network (CAN) messages from the EPB ECU.
Potential impact
The parking brake is not set.
Affected models
Cybertruck
Model 3 2017-2023
Model 3 2024+
Model S 2021+
Model X 2021+
Model Y
Model Y 2025+
Semitruck
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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.