C0566

Brake Booster Solenoid Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Stiff brake pedal
Increased braking force
Brake system fault light comes on

Causes

Brake booster solenoid circuit open
Solenoid malfunction
Wiring harness damage
Problems with the brake system control unit

How to Fix

Check the integrity of the wiring harness to the solenoid
Check solenoid resistance
Replace solenoid if necessary
Check the operation of the brake system control unit

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