The Redundant Control Unit (RCU) power supply voltage is too low.
<0.01% (Extremely rare)
Backup power braking assist unavailable
OK to drive - Schedule service
The RCU may not be able to perform backup power braking assist.
The Redundant Control Unit (RCU) power supply voltage is too low.
The RCU power supply voltage is lower than 9 volts for 500 milliseconds or lower than 6.5 volts for 60 milliseconds.
The RCU power supply voltage has returned above 9.5 volts for 500 milliseconds.
Model Y 2025+
customer, service-fix
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