DTC codes / C05xx · Brakes, steering and suspension / C056A
C056A indicates that the brake booster pressure sensor's power supply circuit has a fault, meaning the anti-lock brake system (ABS) control module is not receiving the expected voltage on the sensor's feed wire. The module monitors this circuit and sets the code when the voltage falls outside the normal operating range, which can prevent the sensor from providing accurate brake booster pressure data.
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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