2021 Jeep Compass ABS Warning & ESS Inoperative TSB

Owners of the 2021 Jeep Compass equipped with either the 1.6L I4 B Eco Turbo Diesel Engine w/ESS (Sales Code EJJ) or the 1.3L I4 Turbo Mair DI Engine w/ESS (Sales Code EYF) may encounter specific issues related to their vehicle's Anti-Lock Brake System (ABS) software. This problem can manifest as warning messages or system malfunctions, impacting the driving experience.

This bulletin, TSB 08-188-24, addresses these concerns by providing a software update for the ABS module. If you are experiencing a Jeep Compass ABS warning or related issues, this information is crucial for understanding the potential cause and resolution.

Symptoms

Customers may observe one or more of the following indicators, signaling a potential issue with the ABS software:

• An instrument panel cluster (IPC) warning message stating: "Auto Hold Unavailable Service Required."
• The IPC "Hold" indicator illuminating intermittently.
• The Engine Stop/Start (ESS) system becoming inoperative.

These symptoms collectively point towards the need for an ABS software update, which is detailed in Technical Service Bulletin 08-188-24.

Diagnosis

To properly diagnose the issue, technicians will use a Scan Tool, specifically wiTECH or an equivalent diagnostic system. This tool allows them to access appropriate Diagnostic Procedures available in DealerCONNECT/Service Library.

The diagnostic process involves verifying that all related systems are functioning as designed. If any Diagnostic Trouble Codes (DTCs) or symptom conditions other than those described in this bulletin are present, these must be recorded and addressed before proceeding with the ABS software update. If the customer's reported symptoms match those listed in this bulletin, the repair procedure can be initiated.

Repair Procedure Summary

The resolution for the Jeep Compass ABS warning and ESS issues involves reprogramming the Anti-Lock Brake System (ABS) module with the latest software. This process requires careful attention to ensure proper execution and prevent further complications.

1. Software Reprogramming: The ABS module is reprogrammed using the latest available software. Detailed instructions for flashing control modules via the wiTECH Diagnostic Application can be found under the application's "HELP" tab.
2. DTC Clearance: After the reprogramming is complete, any Diagnostic Trouble Codes (DTCs) that may have been set in any module during the process must be cleared. The wiTECH application will automatically display these DTCs, allowing the technician to clear them.
3. Post-Flash Routine: Technicians must perform the ECU Replace/Post Flash Procedure routine, accessible under "Misc Functions" within the diagnostic software.

This procedure, identified by Labor Operation No. 18-19-10-AM, has an estimated labor time of 0.4 hours.

Required Tools or Parts

The primary tool required for this service is the wiTECH diagnostic system or an equivalent scan tool capable of performing module reprogramming.

Important Warnings

Several critical precautions must be observed during the reprogramming process to ensure its success and prevent damage to the vehicle's electrical systems:

• Battery Voltage: It is mandatory to install a battery charger to maintain the battery voltage between 13.2 and 13.5 volts throughout the flash process. Allowing the voltage to drop below 13.2 volts or climb above 13.5 volts can interrupt the process or potentially damage the module.
• Interruption: If the flash process is interrupted or aborted for any reason, it must be restarted from the beginning to ensure the software is correctly installed.

Owner Action

If your 2021 Jeep Compass is displaying a Jeep Compass ABS warning like "Auto Hold Unavailable Service Required." or if your Engine Stop/Start (ESS) system is not functioning, you should schedule an appointment with an authorized Jeep dealership. The repair, which involves an ABS software update, is reimbursable under the provisions of your vehicle's warranty. The dealership will use Failure Code CC (Customer Concern) if your symptoms match those described in this Technical Service Bulletin.

---

Source: NHTSA ID: 11006626