Chevrolet Impala 2014–2019 — technical service bulletin
Bulletin 21NA045 · NHTSA communication 10191218 · issued Mar 19, 2021
Technical service bulletin
communication type
Service Brakes
component
2014–2019
model years
12
vehicle entries
Official summary
This service bulletin informs dealers that a new Power Brake Booster Vacuum Cap will need to be replaced when installing the revised Power Brake Booster Vacuum Pipe to correct DTCs being set due to misrouting of brake booster vacuum pipe.
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.