Chevrolet Silverado 4500 2019–2020 — technical service bulletin
Bulletin PIP5742 · NHTSA communication 10178341 · issued Jun 23, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2020
model years
4
vehicle entries
Official summary
This Preliminary information communicates to the dealer technicians that a belt chirp or rubbing noise may be caused by the harmonic balancer out ring moving backward on the pulley and contacting the front cover.
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.