The Redundant Control Unit (RCU) pressure sensor or sensor connection issue.
<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) pressure sensor or sensor connection issue.
The RCU has detected an invalid brake pressure sensor signal or is not receiving a pressure sensor signal.
The RCU receives a valid pressure sensor signal after being power cycled.
Model Y 2025+
customer, service-fix
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