A loud sound may be heard inside the cabin at 1,200–2,500 RPMs on some 2024 XT4 models. (Fig. 6) The sound typically occurs only during one drive cycle and does not repeat on the next drive cycle if the vehicle goes through an extended sleep cycle. However, if the vehicle is turned off and on again without letting vehicle systems to fully enter a sleep cycle, the condition may occur again on the next drive cycle.
The loud sound may be caused by the Active Noise Cancellation (ANC) microphone projecting engine noise inside the cabin. Verify that the sound in the cabin is coming from the ANC microphone by rolling down the window while driving when the sound is occurring. The sound should stop immediately.
Fig. 6
The ANC system reduces the perception of certain undesirable sounds generated by the engine into the vehicle cabin. The system uses microphones and engine speed signals, software integrated into the amplifier/active noise cancellation module, and the vehicle speakers to determine and generate the correct frequencies needed to achieve the desired reduction. The microphones are located in the headliner to monitor noise/sounds in the vehicle cabin and are directly connected to the amplifier/Active Noise Cancellation module.
If the source of the sound is determined to be the ANC microphone, update the Vehicle Communication Unit (VCU) software.
TIP: A VCU software updated was recently released in December 2023 that fully resolves this issue. Vehicles that received a prior VCU software update may require an additional update.
For additional information, refer to Bulletin #23-NA-184.
– Thanks to Kayla Miller
