# Service bulletin 08\-036\-26

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.

- Type: Service bulletin
- NHTSA id: 11028230
- Published by NHTSA: 2026\-02\-04
- Manufacturer's number: 08\-036\-26
- Manufacturer's date: 2026\-01\-31
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's 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

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028230-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028230-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Trouble codes named

P0607, P0AA1, P0AA4, P0B24, P0B28, P0B3E, P0BBD, P0BBE, P0C78, P0CA6, P0CA7, P0DAB, P0EDD, P167B, P1A0C, P1A21, P1A9B, P1C00, P1C01, P1C5E, P1E1B, U0111, U1885

## Vehicles listed

- 2021 JEEP WRANGLER 4XE

## Recalls for the same vehicles and component

- [25V741000](/recalls/nhtsa/25V741000.md), 2025-10-30: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [24V720000](/recalls/nhtsa/24V720000.md), 2024-09-27: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [24V652000](/recalls/nhtsa/24V652000.md), 2024-09-05: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [23V787000](/recalls/nhtsa/23V787000.md), 2023-11-22: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [21V949000](/recalls/nhtsa/21V949000.md), 2021-12-09: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

## Other bulletins for the same vehicles and component

- [S2608000038](/bulletins/11038557.md), 2026-10-16, Service bulletin: ELECTRICAL SYSTEM. High Voltage Battery Has Lower SOC After Overnight Sleep Cycle
- [08\-366\-26](/bulletins/11038526.md), 2026-10-16, Service bulletin: ELECTRICAL SYSTEM. Flash: Drivetrain Control Module \(DTCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● C147B\-92 \- Front Axle Disconnect Sensor Performance or Incorrect Operation Customers may comment on one or more of the following: ● 4WD system warning lights, service messages, or flashing indicators are displayed in the Instrument Panel Cluster \(IPC\). ● The vehicle does not engage 4WD properly. This bulletin involves reprogramming the DTCM with the latest available software.
- [S2608000038](/bulletins/11038520.md), 2026-10-16, Service bulletin: ELECTRICAL SYSTEM. High Voltage Battery Has Lower SOC After Overnight Sleep Cycle
- [08\-366\-26](/bulletins/11038489.md), 2026-10-16, Service bulletin: ELECTRICAL SYSTEM. Flash: Drivetrain Control Module \(DTCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● C147B\-92 \- Front Axle Disconnect Sensor Performance or Incorrect Operation Customers may comment on one or more of the following: ● 4WD system warning lights, service messages, or flashing indicators are displayed in the Instrument Panel Cluster \(IPC\). ● The vehicle does not engage 4WD properly. This bulletin involves reprogramming the DTCM with the latest available software.
- [9100900](/bulletins/11037346.md), 2026-09-17, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Passive Entry O/S Dr Handle Prior to replacing an inoperative passive entry door handle, perform Star Online S2623000040.
- [16C Combo Rev3](/bulletins/11036183.md), 2026-08-13, Warranty extension: ELECTRICAL SYSTEM. EMISSION RECALL – NORTH AMERICA Check Engine/Malfunction Indicator Lamp 16C The instrument panel cluster on about 32,587 of the above vehicles may have an inoperable check engine/malfunction indicator lamp \(CEL/MIL\). \(JT\) vehicles: CEL/MIL and cargo lamp indicator function are swapped. \(JL\) vehicles: CEL/MIL will not turn on. The CEL/MIL in and of itself will not affect emissions. However, if there was an emission issue that would require illumination of the CEL/MIL, the customer would not be alerted. The vehicle would be non\-compliant to the OBD II regulation.
- [08\-260\-26](/bulletins/11034898.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM. Flash: Integrated Dual Charging Module \(IDCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation SYMPTOM: the technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: ● \*\*B22A9\-87 \- ECU Internal Performance \- Missing Message. ● P0D21\-00 \- Battery Charger "A" Output Voltage Too Low.\*\* ● B22A9\-16 \- ECU Internal Performance\-Circuit Voltage Below Threshold. ● B22A9\-17 \- ECU Internal Performance\-Circuit Voltage Above Threshold. ● B22A9\-19 \- ECU Internal Performance \- Overcurrent. ● B22A9\-64 \- ECU Internal Performance\-Signal Plausibility Failure. ● P0D27\-00 \- Battery Charger 1 Input Voltage Too Low. Customers may also comment on one or more of the following: ● Unable to charge the vehicle with level 2 charger. ● Vehicle would not charge and the charge station circuit breaker in the house / receptacle trips when its plugged into the vehicle. \*\*This bulletin involves reprogramming the IDCM with the latest software available.\*\*
- [112862](/bulletins/11034372.md), 2026-07-02, Service bulletin: ELECTRICAL SYSTEM. MOTOR \- BLOWER WITH WHEEL
- [112863](/bulletins/11034371.md), 2026-07-02, Service bulletin: ELECTRICAL SYSTEM. MOTOR \- BLOWER WITH WHEEL
- [9100835](/bulletins/11033957.md), 2026-06-18, Service bulletin: ELECTRICAL SYSTEM. Prior to replacing an inoperative passive entry door handle, perform Star Online S2623000040.

JSON: [/v1/bulletins/11028230](/v1/bulletins/11028230)

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