Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

An open is detected on the high or low power brake booster actuator circuits.
A short to ground is detected on the high power brake booster actuator circuit.
A short to voltage is detected on the high power brake booster actuator circuit.
A short together in the high and low circuits is detected in the power brake booster actuator circuit.
A condition in which no vacuum is detected in the power brake booster for approximately 10 seconds after start-up.
A condition in which low vacuum is detected in the power brake booster for approximately 60 seconds or longer after start-up, or is detected while driving.