Chevrolet Bolt EV 2017–2020 — technical service bulletin
Bulletin 20NA170 · NHTSA communication 10199251 · issued May 3, 2021
Technical service bulletin
communication type
Service Brakes
component
2017–2020
model years
4
vehicle entries
Official summary
This service bulletin provides a procedure to correct a customer concern of a Clicking Type Noise Heard Near Brake Pedal and/or I-Booster Under the Hood.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.