C0586

Brake Booster Motor B Phase U-V-W Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Symptoms

Increased brake pedal force
The brake system fault light is on
Reduced braking performance
Noise from running amplifier motor

Causes

Open or short in phase B wiring harness
Brake booster motor malfunction
Problems with the amplifier control module
Oxidation of contacts in the circuit
Engine position sensor malfunction

How to Fix

Check phase B wiring harness for opens/shorts
Check the resistance of the motor windings
Check power supply and control signals from the module
Clean connector contacts
If necessary, replace the motor or control module

Related codes

C0585 C0587 C0584