The medium-duty Chevy Silverado MD truck lineup, including the Chevy Silverado 4500 HD, 5500 HD, and 6500 HD, is the subject of a new GM Service Update. The update identifies a potential brake fluid leak and what’s required to fix it. The new Service Update was released this month and includes bulletin number N232411300.
The bulletin covers Chevy Silverado MD trucks (4500 HD, 5500 HD, and 6500 HD) produced for the 2023 model year. According to the release, certain units may have a brake fluid leak at the brake pressure switch.
In order to correct this condition, dealers are instructed to inspect the brake pressure switch for suspect lot code 04523. If the vehicle has a brake pressure switch tagged with the suspect lot code, or the code is missing or unreadable, dealers are instructed to replace the brake pressure switch. Additionally, if there is evidence of a fluid leak, then dealers will need to replace both the brake pressure switch and the brake jumper harness.
The Brake Pressure Wiring switch is tagged with part number of 19409480. The fix may also require a wiring harness, battery terminal nut, DOT 3 motor vehicle brake fluid, and blue dielectric grease.
As a reminder, the Chevy Silverado MD is equipped as standard with the 6.6L V8 L5D turbodiesel Duramax engine, which is rated at 350 horsepower and 700 pound-feet of torque. Vehicle production takes place at the Navistar plant in Springfield, Ohio.
In other Chevy Silverado MD news, GM has implemented a new Customer Satisfaction Program with a reimbursement check for customers who were incorrectly charged for an Air Suspension Dump Valve. The reimbursement only applies to 2022 Chevy Silverado MD models, including 4500 HD, 5500 HD, and 6500 HD, with dealers issuing a $60 reimbursement check to affected customers. GM technicians will also replace the switch assembly and disable the Air Suspension Dump Valve switch and Low Pressure indicator.