Some 2008-12 Chevy Express and GMC Savana vans may illuminate the ABS and/or Stability System warning light on the dash and log trouble code C0045 and/or C0050 in the EBCM.
According to GM, one likely cause of the trouble is the front speed sensor harness being improperly routed around the brake hose. That results in the harness being overly taut, which causes the wiring at the speed sensor connector to be pulled out of the terminal crimps as the suspension moves up and down during driving. Replacing one or both sensors is the simple fix. After installation, make sure the wiring runs parallel to the brake hose; not around it.