2025 Jeep Wrangler Cold Air from HVAC TSB 08-111-26

Owners of the 2025 Jeep Wrangler, particularly those equipped with the Remote Start System (Sales Code XBM) and Air Conditioning with Auto Temp Control (Sales Code HAB), may experience an issue where the vehicle blows cold air instead of warm air when remote starting in cold conditions. This behavior occurs even when the HVAC Auto Mode is active, preventing the cabin from warming up as expected. This bulletin, TSB 08-111-26, provides the necessary steps to correct this concern.

This problem, identified in the 2025 Jeep Wrangler, is specifically related to the Electronic Climate Control (ECC) system. The TSB outlines a software update designed to resolve the unexpected cold air output during remote start in cold ambient temperatures.

Symptoms

The primary symptom owners may notice is the vehicle blowing "cold air to the cabin instead of hot air to warm up the cabin interior." This occurs under specific conditions:

• Cold ambient temperatures.
• When the remote start system is active.
• When the HVAC Auto Mode is also active.

If your 2025 Jeep Wrangler exhibits this behavior, it aligns with the issue described in TSB 08-111-26.

Cause

The root cause of the 2025 Jeep Wrangler cold air issue has been identified as a software anomaly within the Electronic Climate Control (ECC) module. This software prevents the system from properly activating the heating function when remote start and HVAC Auto Mode are engaged in cold weather.

Important Warnings for Technicians

When performing the repair, it is crucial to observe the following guidelines:

• Battery Voltage: "Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process." Maintaining stable voltage is critical for a successful software update.
• Interrupted Flash: "If this flash process is interrupted/aborted, the flash should be restarted." Attempting to proceed with an incomplete flash can lead to further issues.

Repair Procedure Summary

The repair for the 2025 Jeep Wrangler cold air problem involves updating the Electronic Climate Control (ECC) module's software. A qualified technician will perform the following steps:

1. Connect a battery charger to the vehicle to ensure the battery voltage remains stable between 13.2 and 13.5 volts throughout the process.
2. Utilize the wiTECH diagnostic application to reprogram the ECC module with the latest available software. If any issues arise during the flashing process, the technician will restart the procedure or contact the Helpdesk.
3. After the reprogramming is complete, the wiTECH application will automatically present any Diagnostic Trouble Codes (DTCs) that may have been set in any module. The technician will then clear all these DTCs.

Required Tools or Parts

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

Owner Action

If your 2025 Jeep Wrangler is experiencing the symptom of blowing cold air during remote start in cold conditions, you should schedule an appointment with an authorized Jeep dealership. The dealer will diagnose the issue and perform the necessary software update for the Electronic Climate Control (ECC) module as outlined in TSB 08-111-26.

This repair is reimbursable under the provisions of the vehicle's warranty. The estimated labor time for this procedure is approximately 0.2 hours.

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Source: NHTSA ID: 11030121