RCU family
RCU_a013_mcuGenericFault
Backup power braking assist unavailable
What does the RCU_a013_mcuGenericFault alert mean?
The Redundant Control Unit (RCU) Micro Controller Unit (MCU) has experienced an issue.
What you'll see in your Tesla
- Backup power braking assist unavailable
- OK to drive - Schedule service
What triggers it
The RCU microcontroller has a software, hardware, or power supply issue.
When it clears
The microcontroller issue is no longer present after the RCU is power cycled. If the issue persists, the RCU may need to be replaced.
Potential impact
The RCU may not be able to perform backup power braking assist.
Affected models
Model Y 2025+
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