General Motors has identified a defect which could affect vehicle safety in certain 2018 Cadillac Escalade, Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 1500 and GMC Yukon vehicles equipped with 5.3L or 6.2L V8 engines. They will be asking owners to return to their dealerships to have the Electronic Brake Control Module reprogrammed.
According to the defect report, these vehicles may have a condition in which the engine mounted vacuum pump output could decrease over time. If the vacuum level drops, drivers may notice a vibration in the brake pedal, increased braking effort, a hard brake pedal and/or increased stopping distances. The drivers information center “Service Brakes” warning light will illuminate and a diagnostic code will be set. The condition is most prevalent at low speed and soft braking.
Dealers will correct the problem by reprogramming the electronic brake control module to improve how the system uses the hydraulic brake boost assist function when the vacuum assist is depleted. GM’s number for this recall is N202300860 and the NHTSA campaign number is 20V-603.