# B221F on the 2021 Jeep Grand Cherokee

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name B221F

- [10229114](https://open.wenmarpro.com/bulletins/10229114), 2023-01-09: Flash: Amplifier \(AMP\) Diagnostic and System Updates This bulletin involves reprogramming the AMP with the latest available software. Customers may experience the following:Active Noise Cancellation \(ANC\) drone noise at 950 between 1,000 RPM, during a start up.The AMP may set B221F\-00 \(Amplifier Internal\) erroneously, it does not affect Active Noise Cancelation \(ANC\) performance. If B221F\-00 is a stored fault update the AMP with appropriate software. If fault is active, follow normal DTC diagnostics.
- [10223152](https://open.wenmarpro.com/bulletins/10223152), 2022-10-17: Flash: Amplifier \(AMP\) Diagnostic and System Updates This bulletin involves reprogramming the AMP with the latest available software. Customers may experience the following:Active Noise Cancellation \(ANC\) drone noise at 950 between 1,000 RPM, during a start up.The AMP may set B221F\-00 \(Amplifier Internal\) erroneously, it does not affect Active Noise Cancelation \(ANC\) performance. If B221F\-00 is a stored fault update the AMP with appropriate software. If fault is active, follow normal DTC diagnostics.
- [10220770](https://open.wenmarpro.com/bulletins/10220770), 2022-09-26: Flash: Amplifier \(AMP\) Diagnostic and System Updates This bulletin involves reprogramming the AMP with the latest available software. Customers may experience the following:Active Noise Cancellation \(ANC\) drone noise at 950 between 1,000 RPM, during a start up.The AMP may set B221F\-00 \(Amplifier Internal\) erroneously, it does not affect Active Noise Cancelation \(ANC\) performance. If B221F\-00 is a stored fault update the AMP with appropriate software. If fault is active, follow normal DTC diagnostics.
- [10212373](https://open.wenmarpro.com/bulletins/10212373), 2022-05-31: Flash: Amplifier \(AMP\) Diagnostic and System Updates This bulletin involves reprogramming the AMP with the latest available software. Customers may experience the following:Active Noise Cancellation \(ANC\) drone noise at 950 between 1,000 RPM, during a start up.The AMP may set B221F\-00 \(Amplifier Internal\) erroneously, it does not affect Active Noise Cancelation \(ANC\) performance. If B221F\-00 is a stored fault update the AMP with appropriate software. If fault is active, follow normal DTC diagnostics.
- [10204325](https://open.wenmarpro.com/bulletins/10204325), 2021-12-13: The DTC B221F\-00 Amplifier Internal Fault Set With No Audio Functionality Concerns