What are the common causes of C057F?

An open winding in brake booster motor A phase U, V or W. A broken or unplugged motor A power connector. A damaged motor A phase harness. A failed phase driver in the brake booster control. A loose or pushed out pin at the motor A connector.

Check the brake booster motor A connector for a loose or damaged fit. Measure resistance across each motor A phase pair. Test the motor A phase wires for an open. Inspect the phase harness for chafe or damage. Replace the brake booster motor if a phase winding is open. Clear the code and retest.

C057F

Brake Booster Motor A Phase U-V-W Circuit/Open

System: Chassis control (C code)
Lamp: Chassis Warning Light
Category: Chassis

What it means

C057F means Brake Booster Motor A Phase U-V-W Circuit/Open.

Check these first

An open winding in brake booster motor A phase U, V or W
A broken or unplugged motor A power connector
A damaged motor A phase harness
A failed phase driver in the brake booster control
A loose or pushed out pin at the motor A connector

What to do next

Check the brake booster motor A connector for a loose or damaged fit
Measure resistance across each motor A phase pair
Test the motor A phase wires for an open
Inspect the phase harness for chafe or damage
Replace the brake booster motor if a phase winding is open
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.