P0556

Brake Booster Pressure Sensor Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–111 (est.)

Causes

Brake booster pressure sensor malfunction
Open or short circuit in wiring harness
Poor contact in sensor connectors
Control unit malfunction

How to Fix

Check the sensor connection and the condition of the wiring harness
Test the pressure sensor with a multimeter
Replace sensor if necessary
Check the condition of the vacuum brake booster
Reset the error and check the system