Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Condition 1

DTC P0556 is not set.
The vehicle is in an AutoStop.
Brake pressure change is less than 30 kPa (4.4 psi).

Condition 2

DTC P0556 is not set.
The vehicle is accelerating with the drivers foot off the brake pedal.
Engine vacuum is less than 20 kPa.
MAF sensor greater than 6 g/s.
Difference in brake booster pressure and engine pressure must be at least 10 kPa (1.5 psi).
Change in brake pressure is less than 30 kPa (4.4 psi).
Master cylinder brake pressure is less than 200 kPa (29 psi).