DTC codes / C05xx · Brakes, steering and suspension / C05BB
The C05BB code indicates that the brake booster motor position sensor supply circuit has a range or performance problem, meaning the control module detected an abnormal voltage or signal behavior on the power or reference line feeding that sensor. This sensor reports the position of the brake booster motor, which assists brake application in electro-hydraulic or electronic brake systems, so the module cannot trust the sensor reading and sets this code.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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