Conditions for Setting the DTC

P0556 

The engine control module detects brake booster vacuum as being less than the intake manifold vacuum for more than 100 ms.

P0557 

The engine control module detects less than 0.01V on the brake booster sensor signal circuit for more than 12.5 ms.

P0558 

The engine control module detects greater than 4.9V on the brake booster sensor signal circuit for more than 12.5 ms.