Vibration Caused by Tires – 2019-2022 Chevrolet Silverado 4500HD/ 5500HD/6500HD

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Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 21-NA-270 Date: September, 2022 INFORMATION Subject: Vibration Caused by Tires Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Silverado 4500HD/ 5500HD/6500HD 2019 2022 Involved Region or Country United States Condition Some customers may comment on a vibration while driving. Cause The cause of the condition may be that the wheel and tire assemblies require Road Force balance. Correction Verify the vibration is from the tires by using Pico scope (NVH) and attach to the workorder. Note: Before using the PICO drive the vehicle 15 to 20 minutes to help reduce the effect of tire flat spots from sitting. 1. Lift and support the vehicle and remove the wheels. Refer to Tire and Wheel Removal and Installation in the Service Manual. 2. Using the hunter Road Balancer, the wheel/tire assembles runout should be measured and the high spots identified and marked. The front tires should have a RFV less than 50 lbs. 3. Once these are measured, the tire pairs should be reinstalled with the high spots clocked 180 degrees from each other. 4. Before tire replacement, follow the match mounting tire to the wheel assembles called out in Bulletin 02-03-10-005C, record the findings. Note: For wheel/tire assemblies above 75 lbs RFV clocking the high spots 180 degrees may not provide enough reduction in vibration. Drive to determine, and replace rear tires as needed to achieve required RFV per wheel tire assembly. 5. Record the RFV for each tire wheel assemble and attach to the work order. • RF- • LF- • RRO- • RRI- • LRO- • LRI- • Runout specification is 0.055 6. For Goodyear tires Record the runout for each tire wheel assemble and attach to the work order. • RF- • LF- • RRO- • RRI- • LRO- • LRI- • Runout specification is 0.055 If a tire needs to be replaced, follow Bulletin 20-NA-159 for warranty Administration, as only the tires that are out of specification should be replaced. Page 2 September, 2022 Bulletin No.: 21-NA-270 Service Procedure Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. Warranty Information For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information: Labor Operation Description Labor Time *8080688 Verify Vibration and Measure and Mark High Spot of the Wheels 0.6 hr Add To Measure – Each Additional Wheel 0.3 hr *This is a unique Labor Operation for Bulletin use only. Version 4 Modified Released November 19, 2021 Revised July 26, 2022– Added 2022 Model Year, added steps to Correction Section, added Important statement under Service Procedure, and added Warranty Information with Labor Operation. Revised August 23, 2022 – Added runout specification to Correction Section Revised September 22, 2022 – Revised Step 2 in Correction section. GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

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