Technical Service Bulletin 08-036-26 — 2021 JEEP WRANGLER 4XE
ELECTRICAL SYSTEM
Bulletin Details
| TSB ID | 08-036-26 |
| Manufacturer | |
| Vehicle | 2021 JEEP WRANGLER 4XE |
| Component | ELECTRICAL SYSTEM |
| Communication Date |
Bulletin 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
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.
Other TSBs for the 2021 JEEP WRANGLER 4XE
18-109-25
ENGINE
18-109-25
ELECTRICAL SYSTEM
S1819000004 REV.R
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S1819000004 REV.R
SUSPENSION
S2208000138 REV.B
ELECTRICAL SYSTEM
08-082-25 REV. A
ELECTRICAL SYSTEM
21-007-25
POWER TRAIN
08-098-24 REV. A
ELECTRICAL SYSTEM
21-024-24 REV. A
POWER TRAIN
75610
STRUCTURE