NHTSA Complaint #11633661 — 2023 CHEVROLET SILVERADO 4500

The contact owns a 2023 GM GM515. The contact stated that the vehicle was designed with a 12-Volt power brake booster auxiliary pump. The contact stated that upon parking and turning off the vehicle, the power brake booster auxiliary pump was running and making a loud sound. The contact stated that upon starting the vehicle, the pump stopped running; however, the failure recurred while the vehicle was turned off. The brake warning light was illuminated. The contact stated that upon disconnecting the power brake booster auxiliary pump wiring cable, the failure ceased; however, the failure recurred upon reconnecting the power brake booster auxiliary pump wiring cable. The vehicle was taken to the dealer, where it was diagnosed that the brake pressure switch was faulty due to brake fluid intrusion. The dealer informed the contact that the vehicle was not covered under GM Campaign Number: N222375270. The dealer replaced the brake pressure switch. The vehicle was repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 59,500.