Mazda CX-5 2017–2018 — technical service bulletin
Bulletin SA-050-21a · NHTSA communication 10202767 · issued Oct 14, 2021
Technical service bulletin
communication type
Power Train
component
2017–2018
model years
2
vehicle entries
Official summary
Some customers may complain about an unusual thumping / rattling noise coming from the engine compartment. The noise is most pronounced under the following conditions: Engine at idle, Transmission in drive, Foot on the brake pedal, A/C OFF, Audio OFF, The noise may be caused by loose fitting heater hoses vibrating the heater hose bracket protector.
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.