2022 Jeep Wrangler P0701 MIL Illumination TSB

Owners of the 2022 Jeep Wrangler equipped with the 2.0L I4 DOHC DI Turbo Engine with ESS (Sales Code EC1) and the 8-Speed Automatic 850RE Transmission (Sales Code DFT) may encounter a specific issue related to their vehicle's transmission control system. This is outlined in Technical Service Bulletin (TSB) 21-034-24, issued on May 17, 2024. The primary symptom is the illumination of the Malfunction Indicator Lamp (MIL), commonly known as the check engine light.

This TSB specifically addresses instances where a technician, upon further investigation, identifies the Diagnostic Trouble Code (DTC) P0701 - Transmission Control System Range/Performance. The root cause of this problem has been identified as the TCM Software.

Symptoms

The most noticeable symptom for owners is the illumination of the "Malfunction Indicator Lamp (MIL) illumination" on the dashboard. This light indicates that the vehicle's onboard diagnostic system has detected a fault within the powertrain.

Fault Codes / DTCs

When a diagnostic scan is performed, the following Diagnostic Trouble Code (DTC) is typically found:

Code	Description
P0701	Transmission Control System Range/Performance

This Jeep Wrangler P0701 code specifically points to an issue within the transmission control system's range or performance, suggesting that the TCM is not operating as expected.

Diagnosis / Trigger Conditions

To diagnose this issue, technicians should use a Scan Tool, such as wiTECH, along with the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library. It's crucial to verify that all related systems are functioning correctly. If any other DTCs or symptom conditions, apart from the MIL illumination and Jeep Wrangler P0701 code, are present, these should be recorded and addressed before proceeding with the TSB's repair procedure.

If the customer's concern matches the symptoms described in the TSB, particularly the MIL illumination and the presence of the P0701 DTC, the repair procedure should be followed.

Important Notes for Technicians

During the reprogramming process, it is critical to install a battery charger to ensure the battery voltage remains between 13.2 and 13.5 volts. The charging voltage must not be allowed to climb above 13.5 volts. If the flash process is interrupted or aborted for any reason, the flash procedure must be restarted from the beginning.

Repair Procedure Summary

The repair outlined in Technical Service Bulletin 21-034-24 involves updating the Transmission Control Module (TCM) software to the latest available version. This process is often referred to as a flash or reprogramming. The specific steps include:

1. Reprogramming the TCM: The technician will reprogram the TCM using the latest software. Detailed instructions for flashing control modules are available within the wiTECH Diagnostic Application by selecting its "HELP" tab.
2. Clearing DTCs: After the TCM has been successfully reprogrammed, any Diagnostic Trouble Codes that may have been set in any modules due to the reprogramming process must be cleared. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.

Required Tools or Parts

To perform this repair, a diagnostic tool such as "wiTECH or Equivalent" is necessary.

Warranty Information

This service is reimbursable within the provisions of the vehicle's warranty. For claims, dealers should use the following information:

• Labor Operation Number: 18-19-05-R4
• Labor Description: Module, Transmission Control (TCM) - Reprogram (0 - Introduction)
• Skill Category: 2 - Automatic Transmission
• Labor Time: 0.2 Hours
• Failure Code: CC (Customer Concern)

Dealers must use failure code CC if the customer's concern matches the symptoms identified in this Technical Service Bulletin. When using this failure code, the 3C's (customer's concern, cause, and correction) must be provided for processing the flash/reprogramming conditions.

NHTSA ID: 10255306