C0299 5A

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

No vacuum is detected in the power brake booster for approximately 10 seconds after start-up.
Low vacuum is detected in the power brake booster for approximately 60 seconds or longer after start-up, or is detected while driving.