{"nhtsa_id":11028230,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-04","date":"2026-01-31","document_id":"08-036-26","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"Flash: Battery Pack Control Module (BPCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):** ● **P0B28-00 - Hybrid/EV Battery “B” Voltage Unstable. ● P0BBE-00 - Hybrid/EV Battery Pack Voltage Variation. ● P0AA1 - Hybrid/EV Battery Positive Contactor “A” Stuck Closed. ● P0C78 - Hybrid/EV Battery System Precharge Time Too Long. ● P0CA6 - Hybrid/EV Battery Charging Current High. ● P0B24 - Hybrid/EV Battery \"A\" Voltage Unstable. ● P1C5E - Hybrid/EV Battery State Of Health Failed.** ● P1A21-00 - HV Battery Contactor Control Sequence Incorrect. ● P0B3E-00 - Hybrid/EV Battery Voltage Sense 1 Circuit High. ● P0607-00 - ECU Internal Performance. ● P1E1B-00 - Hybrid/EV Battery Side Voltage System Isolation. ● P0AA4-00 - Hybrid Battery Negative Contactor Circuit Stuck Closed. ● P1C00-00 - Hybrid/EV Battery Voltage Sense 1 Out Of Range Low. ● P1C01-00 - Hybrid/EV Battery Voltage Sense 1 Out Of Range High. ● P1A9B-00 - Hybrid/EV Battery Temperature Sensor 1 Out Of Range High. ● P0BBD-00 - Hybrid Battery Pack Voltage Variation Exceeded Limit. ● P167B-00 - Controlled System Shutdown. ● U1885-00 - Battery Energy Control Module Lost Communication With HCP. ● P0EDD-00 - Hybrid/EV Battery Pack B Deterioration. ● U0111 - Lost Communication With Hybrid Battery Pack Sensor Module. ● P0CA7-00 - Hybrid/EV Battery Discharging Current High. ● P1A0C-00 - Battery Energy Control Module System Voltage Low. J08 FSAR-TSB-6892 -2- **Customers may also comment on the following: ● Vehicle does not start. NOTE: The no start condition is accompanied with the following DTCs: P0DAB-00, P0607-00, P0AA1, P0AA4, P0C78, P0CA6, P0B24 and/or P1C5E. P0B28 will result in a MIL for 49 days. After 49 days of the MIL, the vehicle will no longer be allowed to start.** This bulletin involves reprogramming the BPCM with the latest available software. NOTE: Additional module flashes are requ","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028230-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11028230-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11028230","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P0607","P0AA1","P0AA4","P0B24","P0B28","P0B3E","P0BBD","P0BBE","P0C78","P0CA6","P0CA7","P0DAB","P0EDD","P167B","P1A0C","P1A21","P1A9B","P1C00","P1C01","P1C5E","P1E1B","U0111","U1885"],"topics":[],"vehicles":[{"make":"JEEP","model":"WRANGLER 4XE","year_from":2021,"year_to":2021,"match":"base","vehicle_ids":["2021_jeep_wrangler"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}