15684 - SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO INSPECT AND, IF NECESSARY, REPOSITION THE MAIN ENGINE-WIRING HARNESS ON CERTAIN 2016 MODEL YEAR CADILLAC ATS-V VEHICLES. IN SOME OF THESE VEHICLES, THE ORIENTATION OF THE MAIN-ENGINE WIRING HARNESS COULD CAUSE THE WIRES TO CONTACT AND CHAFE AGAINST THE RIGHT-FRONT VALVE COVER BOLT AND WASHER. IF THE ENGINE-WIRING HARNESS INSULATION IS COMPROMISED, THE VEHICLE’S TACHOMETER, POWERTRAIN, AND AUTOMATIC-BRAKING SYSTEMS COULD BE EFFECTED. WHILE THIS CONDITION COULD—IF UNCORRECTED—CAUSE A LOSS OF PROPULSION OR THE ACTIVATION OF THE AUTOMATIC BRAKING SYSTEM, GM HAS NO REPORTS INDICATING THAT EITHER EVENT HAS OCCURRED ON A VEHICLE IN THE FIELD.
