C1122 00
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
The EBCM is commanding a valve solenoid to release brake pressure. The wheel that is commanded to release brake pressure has a speed less than 5 km/h (3 mph) for 1.25 seconds.