2022 Jeep Wrangler MIL Illumination for PHEV Battery Issues

Owners of the 2022 Jeep Wrangler 4xe may observe a Malfunction Indicator Lamp (MIL) illumination on their dashboard. This issue is often accompanied by specific diagnostic trouble codes (DTCs) related to the Plug-in Hybrid Electric Vehicle (PHEV) battery system. This condition does not necessarily indicate a true fault but rather a false detection by the Battery Pack Control Module (BPCM).

This manufacturer communication, titled "Flash: Battery Pack Control Module (BPCM) Diagnostic and System Updates", addresses these false warnings by providing a software update for the affected control modules. This update aims to prevent the inaccurate triggering of the MIL and associated DTCs, ensuring proper system operation for the 2022 Jeep Wrangler MIL illumination.

Symptoms

The primary symptom owners will notice is the illumination of the Malfunction Indicator Lamp (MIL) on the instrument cluster. This warning light indicates a potential issue with the vehicle's emissions or powertrain system, even if the vehicle appears to be operating normally. The underlying cause is the reporting of false diagnostic trouble codes by the BPCM.

Fault Codes / DTCs

Technicians diagnosing the issue may find one or more of the following diagnostic trouble codes (DTCs) stored in the vehicle's system:

Code	Description
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

Diagnosis

When these DTCs are present, the diagnosis will typically involve verifying the stored codes. The manufacturer communication indicates that these codes are often false positives, meaning the actual battery components are functioning correctly. The issue stems from the BPCM's diagnostic logic, which incorrectly flags these conditions.

Repair Procedure Summary

The resolution for the 2022 Jeep Wrangler MIL illumination involves updating the software for several control modules. The core of the repair is updating the Battery Pack Control Module (BPCM) with the latest available software. For this update to be fully effective, additional modules also require flashing. These include:

• Powertrain Control Module (PCM)
• Integrated Dual Charging Module (IDCM)
• Transmission Control Module (TCM)
• Hybrid Control Processor (HCP), also known as the Auxiliary Hybrid Control Processor (AHCP) or Power Inverter Module (PIM)

This comprehensive software update, as outlined in the "Flash: Battery Pack Control Module (BPCM) Diagnostic and System Updates" bulletin, ensures that all related systems communicate correctly and prevent the recurrence of these false MIL illuminations.

Owner Action

If you own a 2022 Jeep Wrangler 4xe and experience a Malfunction Indicator Lamp (MIL) illumination with any of the described PHEV battery-related fault codes, it is recommended to schedule an appointment with an authorized Jeep dealership. The software update required to resolve this issue must be performed by a qualified technician using specialized diagnostic tools. This service is typically covered under warranty.

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Source: NHTSA ID: 10248011