What CO131 and CO196 and U1000 2008 GMC ENVOY

Stabilitrak issues.....you need to bring it to a shop with a high end scanner like a Tech 2 to pinpoint the problem. Appears they're all related.

DTC Descriptor
DTC C0131 00: ABS Pressure Circuit No Additional Information
Circuit/System Description
The electronic brake control module (EBCM) uses input from the brake pressure sensor for more accurate control during a Vehicle Stability Enhancement System (VSES) event.

Conditions for Setting the DTC
• Brake signal does not correlate to pressure signal.
• Signal is erratic and changes faster than physically allowed.
Action Taken When the DTC Sets
• The Traction Control indicator turns ON.
• The driver information center (DIC) displays the Service Stability System message.

Circuit/System Testing
Apply and release brake pedal. Verify brake lamps operate properly.
? If brake lamps do not operate properly, refer to Symptoms - Lighting Systems .
Replace EBCM/brake pressure modulator valve (BPMV) assembly.
DTC C0196 00: Yaw Rate Circuit No Additional Information
Circuit/System Description
The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (EBCM) calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle yaw motion by applying differential braking to the wheels.

DTC U1000: Class 2 Data Link
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for state of health (SOH) monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within about 5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. If more than one critical parameter does not have an identification number association, the DTC will only be reported once.