2023-2024 Jeep MGU Replacement TSB 08-144-24

Jeep has released Technical Service Bulletin (TSB) 08-144-24 to address issues with the Motor Generator Unit (MGU) in certain 2023-2024 Jeep Wrangler and Grand Cherokee models. This bulletin specifically applies to vehicles equipped with the 2.0L I4 DOHC DI Turbo PHEV Engine (Sales Code ECX). The TSB outlines a procedure for inspecting the MGU's serial number and, if necessary, replacing the unit to resolve customer complaints related to the Jeep MGU replacement P1B0F-00 issue.

Symptoms

Owners of affected vehicles may experience one or more of the following symptoms:

• Malfunction Indicator Lamp (MIL) illumination on the dashboard.
• The vehicle may enter limp home mode, restricting performance to prevent further damage.
• In some cases, the vehicle does not start at all.

Upon diagnosis, technicians will likely find the Diagnostic Trouble Code (DTC) P1B0F-00, indicating a "Drive Motor A Position Sensor Offset Incorrect" condition.

Fault Codes / DTCs

This bulletin specifically addresses the following Diagnostic Trouble Code:

Code	Description
P1B0F-00	Drive Motor A Position Sensor Offset Incorrect

Diagnosis / Trigger Conditions

To diagnose the issue, technicians are instructed to use a wiTECH scan tool. The primary diagnostic step is to confirm the presence of DTC P1B0F-00. If this specific fault code is set, the technician will proceed with the inspection outlined in TSB 08-144-24. If other DTCs or symptoms are present, they should be addressed first according to standard diagnostic procedures.

Repair Procedure Summary

The repair procedure for the Jeep MGU replacement P1B0F-00 involves a detailed inspection and potential replacement of the Motor Generator Unit. Here's a summary of the steps:

1. Verify DTC: The technician first checks if the DTC P1B0F-00 is present. If it is not, this bulletin does not apply.
2. Locate MGU Label: The technician will locate the label on the Motor Generator Unit.
3. Read Serial Number: The serial number from the MGU label is read.
4. Check Serial Number Range: The serial number is then checked against specific ranges provided in the bulletin:
   • For JL models: TVSIY0813Z0241 to TVSIY2413Z0005
   • For WL models: TVSIY0903Z0714 to TVSIY2383Z0673
5. MGU Replacement: If the MGU serial number falls within these specified ranges, the MGU must be replaced. Detailed service procedures for MGU removal and installation are available in DealerCONNECT/Service Library under "Service Info > 12 - Electrified Powertrain System / Electric Powertrain Control / Motors, Electric Drive / Removal and Installation."
6. Clear DTCs: After replacement, all Diagnostic Trouble Codes are cleared.
7. Re-check DTC: The vehicle is re-evaluated to ensure the DTC P1B0F-00 does not return. If it does, further normal diagnosis is required.

Required Parts

If a replacement MGU is necessary, the following part numbers are used:

• 05190161AM: Motor, Electric (for JL MGU)
• 05190309AF: Motor, Electric (for WL MGU)

Owner Action

If you own a 2023-2024 Jeep Wrangler or Grand Cherokee with the 2.0L I4 DOHC DI Turbo PHEV Engine and are experiencing a Malfunction Indicator Lamp (MIL) illumination, the vehicle entering limp home mode, or a no-start condition, especially if accompanied by the DTC P1B0F-00, you should contact your authorized Jeep dealer. They will perform the necessary diagnostic steps outlined in TSB 08-144-24 to inspect your MGU and replace it if required. This repair is reimbursable under the provisions of the vehicle's warranty.

NHTSA ID: 11002313