2021 Jeep Wrangler Charging System MIL and DTCs TSB

Owners of the 2021 Jeep Wrangler may encounter issues such as the Malfunction Indicator Lamp (MIL) illuminating or difficulties with vehicle charging. These problems are often linked to specific diagnostic trouble codes (DTCs) and can be addressed through a software update for the Integrated Dual Charging Module (IDCM) and related control units.

This technical service bulletin, titled "Flash: Integrated Dual Charging Module (IDCM) Enhancements," provides a solution for these concerns, ensuring proper vehicle operation and charging capabilities for the 2021 Jeep Wrangler manufacturer_communication.

Symptoms You Might Notice

If your 2021 Jeep Wrangler is affected, you might observe one or more of the following symptoms:

• Illumination of the Malfunction Indicator Lamp (MIL).
• An inability to charge the vehicle using a Level 2 charger, indicated by the message: "Unable to charge the vehicle with level 2 charger."
• The vehicle failing to charge, and the charge station's circuit breaker tripping when plugged into the vehicle, indicated by the message: "Vehicle would not charge and the charge station circuit breaker in the house / receptacle trips when its plugged into the vehicle."

Fault Codes / DTCs

Technicians investigating these symptoms may find the following diagnostic trouble codes (DTCs) stored in the vehicle's system:

Code	Description
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

Diagnosis and Trigger Conditions

These issues typically arise from internal performance anomalies within the Integrated Dual Charging Module (IDCM) or related charging system components. The DTCs indicate conditions such as incorrect circuit voltage, overcurrent, or signal plausibility failures within the ECU, as well as low input voltage to the battery charger. These conditions directly impact the vehicle's ability to charge efficiently and can trigger the MIL.

Repair Procedure Summary

The recommended repair for these issues involves updating the software for several key modules in your 2021 Jeep Wrangler. The primary focus is reprogramming the Integrated Dual Charging Module (IDCM) with the latest available software. For this update to be fully effective, additional modules must also be updated simultaneously. These include:

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

This comprehensive software update ensures all related systems are operating with the latest calibrations, resolving the underlying causes of the MIL illumination and charging problems described in this 2021 Jeep Wrangler manufacturer_communication.

Owner Action

If you are experiencing any of the described symptoms, such as your Malfunction Indicator Lamp (MIL) being on or issues charging your 2021 Jeep Wrangler, it is recommended to schedule an appointment with your authorized Jeep dealership. They have the necessary tools and software to perform the required module reprogramming as detailed in the "Flash: Integrated Dual Charging Module (IDCM) Enhancements" TSB. This repair is typically covered under warranty.

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Source: NHTSA ID: 10248013