2012 Chevrolet Express

ABS Valve Body / Pump Harness chafed through brake hydraulic line near transmission crossmember. This resulted in a hydraulic leak and loss of brake pedal feel / partial loss of brakes. Fortunately failure occurred in the driveway--I had 4500 Lbs of sailboat trailer hitched to the van and was about to go on a long trip. Design issue. Wiring harness should not be located so as to chafe on hydraulic lines. This is not the first chafe related failure on this vehicle.

Vehicle is upfitted as a school bus. Forward fuel tank strap failed in operation. Our company operates more than 100 of these vehicles and we experience a failure of fuel tank straps at a rate of about one vehicle per month. If the 2nd strap would also fail the gasoline tank would become dislodged and present a re hazard. This is even more critical as these vehicles are carrying students as a school bus. We perform visual inspections of the straps at 6 month intervals (per Pennsylvania these vehicles are subject to Semi-Annual State Inspection). There were no symptoms of the problem before this failure. There are never symptoms of the problem.

Vehicle is upfitted as a school bus. Forward fuel tank strap failed in operation. Our company operates more than 100 of these vehicles and we experience a failure of fuel tank straps at a rate of about one vehicle per month. If the 2nd strap would also fail the gasoline tank would become dislodged and present a fire hazard. This is even more critical as these vehicles are carrying students as a school bus. We perform visual inspections of the straps at 6 month intervals (per Pennsylvania these vehicles are subject to Semi-Annual State Inspection). There were no symptoms of the problem before this failure. There are never symptoms of the problem before any failure. Failed fuel tank straps on this were repaired by GM Dealer (Faulkner GMC, 705 Auto Park Blvd, West Chester, PA 19382) (Invoice #677658 - Invoice Date Feb 25 2025).

I MANAGE A FLEET OF 53 SCHOOL BUSES, MODEL YEARS RANGING FROM 2008 TO 2015. I HAVE NOTICED A TREND WITH THE HYDRO BOOSTERS AND MASTER CYLINDERS, THEY TEND TO LEAK INTERNALLY ON THESE GM VEHICLES SOME HAVE BEGUN TO LEAK AS EARLY AS 30,000 MILES. I EXPECT TO HAVE TO REPLACE ALL OF THESE COMPONENTS, ON EVERY BUS IN THE NEAR FUTURE. AS THE FLEET AGES THE TREND IS GETTING INCREASINGLY WORSE. I BELIEVE THIS IS A DANGEROUS SITUATION BECAUSE I AM VIGILANT WITH KEEPING UP ON THIS ISSUE, HOWEVER I AM NOT SURE THAT THE GENERAL PUBLIC WILL HAVE THE SAME UNDERSTANDING ABOUT THE DANGER OF THIS DESIGN FLAW. I HAVE HAD BUSES COME IN BLEEDING BRAKE FLUID OR HYDRAULIC FLUID.

THE ENGINE WILL GO TO LOW POWER AND NOT GO MORE THAN 30 MPH WITHOUT WARNING. THIS IS AN AMBULANCE CHASSIS AND IS A KNOW PROBLEM GM HAS NOT ADDRESSED YET IN THE 2012 AND 2013 CHASSIS. IT CAN DO THIS ON HWYS WITH SPEED LIMITS OF 55, 65, 70 MPH SUDDENLY WHICH COULD CAUSE AN ACCIDENT AS NO STOP LIGHTS GIVE ANY WARNING AND YOU CAN'T SPEED UP ANYTIME IN POOR VISIBILITY OR AT ANYTIME. NOT ONLY IS IT BAD FOR THE INJURED OR ILL PATIENT IT COULD CAUSE AN ACCIDENT AND INJURY OTHERS. GM HAS FIXED THIS ON THE 2014 AND NEWER MODELS BUT NOT 12 &13. THIS IS NOT JUST OUR ONE UNIT THIS IS 2012 AND 2013 CHEVY DIESELS AMBULANCE ALL OVER THE US. WE HAVE FOUR UNITS THAT IT CAN HAPPEN TO AND TWO THAT IS HAS WITH PATIENTS. I HAVE CONTACTED THE EPA, GM, AND OUR INDIANA STATE SENATORS TRYING TO GET THIS DANGEROUS SITUATION TAKEN CARE OF IN THE LAST FEW DAYS. I AM ASKING ANYONE WHO WILL LISTEN TO HELP PUSH GM FOR A FIX.

ENGINE WAS AT IDLE HAD PULLED INTO GAS STATION . ALARMS WENT OFF CHECK ENGINE LIGHT CAME ON, STABLE TRACK ERROR, MULTIPLE TONES. AFTER 20 SECONDS ENGINE STALLED. WOULD NOT CRANK. AFTER TALKING TO PEOPLE AND COUPLE TRIES FIX TOOK TO DEALERSHIP AS IT WAS DIAGNOSED TO BE THE ENGINE CONTROL MODULE SHORTED. I HAD GONE THRU RAIN EARLIER AND A COUPLE STORMS PASSED THRU WHILE AT STATION AND EATING. DEALER REPLACED ENGINE CONTROL MODULE AND PROGRAMMED IT. THIS COULD OF HAPPENED WHILE DRIVING AND WOULD OF LOST ENGINE POWER AND POWER STEERING. SINCE JUST MODULE REPLACED AND BEN TOLD IT IS KNOW TO SHORT OUT WHEN WET IT COULD HAPPEN AGAIN.

TL* THE CONTACT OWNS A 2012 CHEVROLET EXPRESS. WHEN THE BRAKES WERE DEPRESSED AND RELEASED, THE VEHICLE BEGAN TO SHAKE VIOLENTLY. THE CONTACT MENTIONED THAT THE STABILITRAK ACTIVATED INDEPENDENTLY AFTER BEING TURNED OFF WITHOUT WARNING. THE VEHICLE WAS TAKEN TO DEALER. THE TECHNICIAN WAS UNABLE TO DIAGNOSE THE FAILURE. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 47,000.