Ford Explorer 2021 — technical service bulletin
Bulletin 21U04 · NHTSA communication 10199483 · issued Jul 2, 2021
Technical service bulletin
communication type
Electrical System
component
2021
model years
2
vehicle entries
Official summary
In some of the effected vehicles the active noise cancelation (ANC) and electronic sound enhancement (ESE) features were not activated in the audio control module (ACM). This can cause undesirable powertrain sounds inside the vehicle, and less than optimal speaker sound from ST products, resulting in customer dissatisfaction.
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.