Circuit/System Verification
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.
Ignition ON, verify that DTC C1120 or C1121 are not set.
- If the DTC is set, replace the brake pressure modulator valve. If the DTC resets, replace the EBCM..