Home08-036-26 · JEEP
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

NHTSA manufacturer communications ↗

Reported code forms

Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

JeepP0C78
Hybrid/EV Battery System Precharge Time Too Long

NHTSA 11028230

Check vehicle applicability

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

MakeModelModel year
JeepWRANGLER 4XE2021

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