2008 Enclave CXL FWD - ABS & Traction Control Lights

[TN2021]

2008 Enclave CXL FWD

After starting and driving 50'-0", the ABS & Traction Control lights will illuminate, but no check engine light.

If remaining in park after starting, the lights will not illuminate; cycling the traction control button, the dash light will cycle on and off, but after the initial 50'-0" the ABS and trac control lights illuminate and will not turn-off until the vehicle is turned-off.

Local garage scanned and found the following codes:

• U0136 - Lost Communication With Rear Differential Control Module
• C0131.4B - Traction Control System Pressure Circuit/ Pressure Not Learned
  • Replaced BPPS, still throws C0131

Perplexing part, its a FWD model, not AWD, so why am i getting the U0136? Are the two codes related?

Any suggestions and/ or guidance would be greatly appreciated.