GM Issued Service Bulletin for 2027 Chevy Bolt Rattle
Owners of the 2027 Chevy Bolt experiencing windshield-area rattling can seek a professional repair via a new GM service bulletin.
Updated on Oct. 5, 2026 in Electric Vehicles
Live Poll
Do you trust that car manufacturers maintain high quality standards on new vehicle models?
General Motors has issued service bulletin 26-NA-201 to address rattling noises occurring in 2027 Chevy Bolt vehicles. The sound stems from a loose insert within the multifunction sensor mount bracket cover located behind the rearview mirror.
Why it matters
This service bulletin provides a standardized repair for an annoying cabin rattle that occurs when the vehicle travels over bumps. Addressing the loose component promptly ensures the sensor mount remains secure during the vehicle's 18-month production cycle.
Service bulletin 26-NA-201 identifies the cause of the noise as a loose insert in the sensor mount bracket behind the rearview mirror. Technicians must apply two pieces of felt tape, each 6.5 mm by 6.5 mm and 1 mm thick, to the insert tabs to resolve the issue.
The players
General Motors
The Detroit-based automaker produces the Chevy Bolt at its Fairfax Assembly plant and manages service communications for its vehicle fleet.
The details
The rattle occurs when driving over uneven surfaces because the sensor mount bracket cover insert lacks a tight fit. To fix this, a technician removes the loose cover insert and applies the specified felt or flocking tape to the forward tabs. The cover is then reattached, ensuring the tape patches make firm contact with the rear tuning bumps to stabilize the assembly.
Timeline
- 2026-10-05
GM issued service bulletin 26-NA-201 regarding the 2027 Chevy Bolt rattling noise.
The Home Front
The Magnuson-Moss Warranty Act mandates that manufacturers provide clear repair standards, which General Motors upholds by releasing technical bulletins for new vehicle production. This development aligns with standard quality control processes for the 2027 Chevy Bolt's 18-month production run.
If you notice a rattling sound coming from the area behind your rearview mirror while driving your 2027 Chevy Bolt, schedule an appointment with your local dealer to reference service bulletin 26-NA-201. Do not attempt to remove the sensor cover yourself, as it houses sensitive multifunction equipment.
The takeaway
Rattling sounds in new vehicles are often traced back to minor fitment issues in interior trim or sensor covers. If your vehicle is affected, keep a copy of the service bulletin reference number, 26-NA-201, to assist your service advisor during your next dealership visit.
Further reading
For more information on the latest model updates and maintenance guidance, visit the Electric Vehicles section.
Live Poll
Do you trust that car manufacturers maintain high quality standards on new vehicle models?
