NHTSA Complaint #10475140 — 2012 CHEVROLET COLORADO

AT APPROXIMATELY 350 MILES ON THE TRUCK ODOMETER, THE DASHBOARD WARNING MODULE ON MY NEW 2012 CHEVROLET COLORADO PICKUP TRUCK ILLUMINATED WITH "SERVICE STAB SYS". THE WARNING LIGHT REMAINED ON UNTIL I PARKED THE TRUCK. I TOOK THE TRUCK TO THE DEALERSHIP SERVICE CENTER. THE SERVICE REPRESENTATIVE AT THE DEALER TOLD ME TO IGNORE THE WARNING LIGHT. THE TECHNICIAN COULD NOT FIND A FAULT CODE STORED THAT REFLECTED A STABILITY PROBLEM. HE TOLD ME THAT NO SUCH WARNING COULD HAVE ILLUMINATED OR IT WOULD BE IN THE MEMORY OF THE VEHICLE??S COMPUTER. THIS WARNING MESSAGE: " SERVICE STAB SYS" AND THE TRACTION WARNING LIGHT NOW COME ON REPEATEDLY. IN JULY 2012, WHILE DRIVING AT 65 MPH ON I-40, THE SAME WARNING ILLUMINATED. THIS WAS FOLLOWED IMMEDIATELY BY A VIOLENT SHUDDER IN THE STEERING SYSTEM AND WHAT FELT LIKE UNEVEN APPLICATION OF THE FRONT BRAKES FOR FRACTIONS OF A SECOND. I PULLED OVER AND CALLED ONSTAR WHO RAN A SYSTEM CHECK. ONSTAR COULD SEE THE STABILITY SYSTEM WARNING WAS ON BUT NO FAULT CODE WAS DETECTED. I TOOK THE TRUCK BACK TO THE DEALERSHIP. THEY TOLD ME THAT THERE WAS NO FAULT RECORDED IN THE VEHICLE MEMORY AND THEY COULD FIND NOTHING WRONG WITH THE TRUCK AND WERE UNABLE TO DUPLICATE THE PROBLEM. THEY TOLD ME THAT THERE WAS NO SYSTEM OR FUNCTION IN THE TRUCK OR THE STABILITY SYSTEM THAT COULD MAKE THE TRUCK SHUDDER AS I DESCRIBED OR THAT COULD INDEPENDENTLY APPLY BRAKING. THIS HAS HAPPENED REPEATEDLY, WITH THE SHUDDER ALSO RE-OCCURRING. CHEVROLET AND THE DEALER TELL ME THERE IS NO PRIOR HISTORY OF PROBLEMS WITH THE STABILITY SYSTEM IN COLORADO PICKUPS. SUCH SHUDDERING IN THE STEERING AT HIGHWAY SPEED CANNOT BE A SAFE CONDITION. ON ONE OCCASION ONSTAR DETECTED A CODE OF C-197. THE TRUCK IS AGAIN AT THE DEALERSHIP SERVICE CENTER WHO STATE THAT THEY CAN FIND NOTHING WRONG WITH THE STABILITY SYSTEM IN THE TRUCK. *TR