2024-2025 Jeep Key Fob Low Battery Warning TSB 9100654

Owners of 2024-2025 Jeep Wrangler and Gladiator vehicles may encounter a "FOB Low Battery" warning message on their instrument cluster. This manufacturer communication, identified as TSB 9100654, provides crucial diagnostic steps for technicians to follow before replacing the key fob coin battery. The aim is to ensure that a Jeep key fob low battery is accurately diagnosed, preventing unnecessary replacements and ensuring proper vehicle functionality.

Symptoms

The primary symptom owners will notice is the explicit message "FOB Low Battery" displayed on the instrument cluster. This warning indicates that the key fob's internal coin battery is losing its charge. A low key fob battery can lead to intermittent remote functions, reduced operating range, or even an inability to start the vehicle using the key fob.

Fault Codes / DTCs

In addition to the instrument cluster message, a low key fob battery condition may also trigger specific diagnostic trouble codes (DTCs) within the vehicle's system. Technicians should check for the presence of these codes:

• B1A10-00: Associated with Fob battery 1
• B1A11-00: Associated with Fob battery 2

These DTCs provide electronic confirmation of a detected low voltage condition in one or both key fobs.

Diagnosis and Verification Steps

Before any replacement of the key fob coin battery (part number 68384435AS), technicians are instructed to perform a series of verification steps to accurately diagnose the Jeep key fob low battery issue. These steps ensure that the battery is indeed the cause of the warning and that the correct key fob is being serviced:

1. Instrument Cluster Message Confirmation: Verify that the "FOB Low Battery" message is actively displayed on the vehicle's instrument cluster.
2. Active DTC Check: Confirm the presence of an active DTC B1A10-00 or B1A11-00 related to the key fob battery.
3. Original Battery Type Identification: Inspect the key fob to determine if the original battery installed is either a Varta or Panasonic brand, specifically a CR 2450 size. This helps ensure consistency and proper battery specifications.
4. Key Fob ID Verification: The fob ID printed under the battery cover must be verified against the fob IDs stored within the vehicle's Radio Frequency Hub (RFHUB). Technicians should use diagnostic tool function DID $A004 - Engineering Development Data 1 to check the fob IDs in the RFHUB. This step is crucial for confirming the key fob is correctly recognized by the vehicle's security system.
5. Coin Battery Voltage Measurement: Crucially, the voltage of the coin battery must be checked. The battery should only be replaced if its measured voltage is 2.3V or below. Technicians are also required to report this voltage reading in their repair narratives.

Repair Procedure Summary

The repair procedure for a Jeep key fob low battery is straightforward once the diagnostic steps confirm an actual low voltage condition. If the key fob coin battery's voltage is measured at 2.3V or below, it should be replaced. This precise voltage threshold is critical to prevent premature or unnecessary battery replacement.

Important Warnings

Technicians are explicitly instructed to "replace the battery only if the voltage is 2.3V or below." This directive is vital to ensure that key fob batteries are not replaced unnecessarily, saving costs and ensuring that the actual cause of the warning is addressed. Owners should be aware that a simple battery swap without proper diagnosis may not resolve the issue if the voltage is not genuinely low or if there's another underlying problem.

Required Tools or Parts

For this service, the primary replacement part is a CR 2450 coin battery, ideally from Varta or Panasonic, matching the original equipment. Diagnostic tools capable of accessing and verifying RFHUB data, specifically using DID $A004 - Engineering Development Data 1, are also necessary for technicians to perform the required fob ID verification.

Owner Action

If you own a 2024-2025 Jeep Wrangler or Gladiator and see a "FOB Low Battery" message or suspect a Jeep key fob low battery issue, it is recommended to visit a certified Jeep dealership. Due to the specific diagnostic steps involving DTC checks, fob ID verification with the RFHUB, and precise voltage measurement, a professional diagnosis is essential. This ensures that the problem is correctly identified and resolved, avoiding unnecessary battery replacements.

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NHTSA ID: 11022018