JEEP
08-036-26
Manufacturer communications
- Publication date
- 2026-01-31
- Received by NHTSA
- 2026-02-04
- NHTSA record numbers
- 11028230
Manufacturer summary
Original wording in English
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
• **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
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Jeep
P0607-00ECU Internal PerformanceJeep
P0AA1Hybrid/EV Battery Positive Contactor “A” Stuck ClosedJeep
P0AA4-00Hybrid Battery Negative Contactor Circuit Stuck ClosedJeep
P0B24Hybrid/EV Battery "A" Voltage UnstableJeep
P0B28-00Hybrid/EV Battery “B” Voltage UnstableJeep
P0B3E-00Hybrid/EV Battery Voltage Sense 1 Circuit HighJeep
P0BBD-00Hybrid Battery Pack Voltage Variation Exceeded LimitJeep
P0BBE-00Hybrid/EV Battery Pack Voltage VariationJeep
P0C78Hybrid/EV Battery System Precharge Time Too LongJeep
P0CA6Hybrid/EV Battery Charging Current HighJeep
P0CA7-00Hybrid/EV Battery Discharging Current HighJeep
P0EDD-00Hybrid/EV Battery Pack B DeteriorationJeep
P167B-00Controlled System ShutdownJeep
P1A0C-00Battery Energy Control Module System Voltage LowJeep
P1A21-00HV Battery Contactor Control Sequence IncorrectJeep
P1A9B-00Hybrid/EV Battery Temperature Sensor 1 Out Of Range HighJeep
P1C00-00Hybrid/EV Battery Voltage Sense 1 Out Of Range LowJeep
P1C01-00Hybrid/EV Battery Voltage Sense 1 Out Of Range HighJeep
P1C5EHybrid/EV Battery State Of Health FailedJeep
P1E1B-00Hybrid/EV Battery Side Voltage System IsolationCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Jeep | WRANGLER 4XE | 2021 |