The Redundant Control Unit (RCU) has detected a hydraulic brake fluid leak.
<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) has detected a hydraulic brake fluid leak.
The RCU detects an internal or external hydraulic brake fluid leak or detects air in the hydraulic system.
The RCU no longer detects a hydraulic leakage or air after being power cycled.
Model Y 2025+
customer, service-fix
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