2023 Jeep Wrangler PIM Software Update TSB 08-061-25

Jeep has released Technical Service Bulletin (TSB) 08-061-25, dated March 7, 2025, to address specific software-related concerns in certain 2023 Jeep Wrangler models. This bulletin applies to vehicles equipped with the 2.0L I4 DOHC DI Turbo PHEV Engine, identified by Sales Code ECX. The primary solution involves updating the software for the Power Inverter Module (PIM).

This TSB aims to resolve issues that can lead to a "Malfunction Indicator Lamp (MIL) illumination" and affect the vehicle's hybrid system functionality. Owners experiencing these symptoms should consult their dealership for the necessary software update, which is a critical step to ensure the proper operation of their 2023 Jeep Wrangler PIM software update.

Symptoms

Owners of affected 2023 Jeep Wrangler vehicles may first notice a "Malfunction Indicator Lamp (MIL) illumination" on their dashboard. Beyond the warning light, more significant operational issues can occur.

These include the "Electric Vehicle (EV) system shuts down while transferring over to Internal Combustion Engine (ICE) motive power." Additionally, the "Engine Stop Start (ESS) function will also not operate" as a result of this condition, impacting fuel efficiency and vehicle behavior.

Fault Codes / DTCs

When the symptoms described above are present, a technician investigating the issue will likely find one or more specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's system. These codes help pinpoint the exact nature of the problem.

Code	Description
P0C19-00	Drive Motor A Torque Delivered Performance
P1B03-00	Resolver Signal / MCPA Rationality

Diagnosis and Trigger Conditions

Before proceeding with any repairs, technicians are instructed to use a Scan Tool (wiTECH) to verify that all related systems are functioning as designed. They must confirm the presence of the specified DTCs or symptom conditions. If other DTCs or symptoms are present, they should be addressed first.

The issue is directly linked to the PIM software. If a customer reports the described symptoms, the next step is to perform the repair procedure outlined in TSB 08-061-25.

Repair Procedure Summary

The core of the repair involves reprogramming the Auxiliary Hybrid Control Processor (AHCP), also known as the Power Inverter Module (PIM), with the latest available software. This process requires specialized tools and adherence to strict safety protocols due to the high-voltage components involved.

Technicians must first ensure the vehicle is safe by disconnecting the power supply of the high-voltage system. Only specifically trained and qualified technicians are authorized to work on high-voltage systems. Before beginning, a battery charger must be installed to maintain sufficient battery voltage throughout the flash process.

The procedure includes disabling the HV Battery Contactors using the wiTECH tool, then reprogramming the PIM. If any issues arise during the flash, a helpdesk ticket should be submitted. After successful reprogramming, the HV Battery Contactors are re-enabled, and any DTCs that may have been set during the process are cleared. It is crucial that the vehicle is not connected to a high voltage charger while performing these software updates for the 2023 Jeep Wrangler PIM software update.

Required Tools or Parts

The primary tool required for this service is a wiTECH or equivalent scan tool. This tool is essential for disabling and enabling high-voltage battery contactors, performing the PIM software reprogramming, and clearing diagnostic trouble codes.

Important Warnings

Technicians must exercise extreme caution when working on high-voltage systems. It is critical to ensure the power supply of the high-voltage system is disconnected throughout the operation. Only trained and qualified technicians are authorized to perform repairs on vehicles with high-voltage systems.

Owners should be aware that the vehicle must not be connected to a high voltage charger when software updates are being performed. If the flash process is interrupted or aborted, it must be restarted from the beginning. A battery charger must be installed to ensure stable battery voltage during the reprogramming.

Owner Action

If you own a 2023 Jeep Wrangler with the 2.0L I4 DOHC DI Turbo PHEV engine and are experiencing a "Malfunction Indicator Lamp (MIL) illumination," EV system shutdowns, or an inoperative Engine Stop Start (ESS) function, you should contact your authorized Jeep dealership. Inform them about the symptoms and the potential need for TSB 08-061-25.

The repair, which involves reprogramming the PIM, is reimbursable under the provisions of the warranty. The labor operation for this service is 18-19-86-BD, with an estimated labor time of 0.6 hours. The dealership will use failure code CC (Customer Concern) when processing this repair.

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Source: NHTSA ID: 11015534