{"vehicle":{"id":"2021_jeep_grand-cherokee","year":2021,"make":"Jeep","model":"Grand Cherokee"},"code":"B221F","generic":false,"description":null,"bulletins":{"as_of":"2026-10-19","count":5,"bulletins":[{"nhtsa_id":10229114,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-01-09","date":"2022-03-01","document_id":"0804122","mfr_campaign":null,"component":"BACK OVER PREVENTION","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10229114-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10229114-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10229114"},{"nhtsa_id":10223152,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-17","date":"2022-03-01","document_id":"0804122","mfr_campaign":null,"component":"BACK OVER PREVENTION","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10223152-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10223152-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10223152"},{"nhtsa_id":10220770,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-26","date":"2022-03-01","document_id":"0804122","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10220770-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10220770-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10220770"},{"nhtsa_id":10212373,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-05-31","date":"2022-03-01","document_id":"0804122","mfr_campaign":null,"component":"ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10212373-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10212373-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10212373"},{"nhtsa_id":10204325,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-13","date":"2021-11-09","document_id":"S2108000265","mfr_campaign":null,"component":"EQUIPMENT:ELECTRICAL","summary":"The DTC B221F-00 Amplifier Internal Fault Set With No Audio Functionality Concerns","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204325-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10204325-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10204325"}],"url":"https://open.wenmarpro.com/makes/jeep/grand-cherokee/2021/bulletins?code=B221F"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/jeep/grand-cherokee/2021/codes/B221F","note":"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.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}