2021-2024 Jeep, RAM, Dodge RKE System Malfunctions

Owners of 2021-2024 Jeep, RAM, and Dodge vehicles may encounter problems with their Remote Keyless Entry (RKE) system, ranging from complete non-functionality to intermittent response. This issue, detailed in Technical Service Bulletin (TSB) S2408000015 Rev. C, can manifest as a key fob that doesn't work, a vehicle that doesn't respond to RKE commands, or difficulties with key programming and remote start functions. For instance, a 2023 Jeep Wrangler RKE B1A76-11 fault indicates a specific problem with the remote start antenna circuit.

This bulletin, released in July 2024, provides technicians with a structured approach to diagnose and resolve these RKE system malfunctions. It covers scenarios where diagnostic trouble codes (DTCs) are present, as well as situations where the key fob is not working without any recorded codes.

Symptoms of RKE System Malfunctions

Vehicle owners might observe the following issues related to their RKE system:

• "Remote Keyless Entry (RKE) Functions Do Not Work"
• "Intermittent Vehicle Response When Using the RKE"
• "Key Not Programmed"
• Difficulties when "Adding Remote Start" functionality

These symptoms often lead to frustration, especially when the vehicle fails to lock, unlock, or start remotely as expected.

Fault Codes / DTCs

When the RKE system experiences issues, specific Diagnostic Trouble Codes (DTCs) may be stored in the vehicle's modules. These codes help pinpoint the area of concern, particularly relating to the Passive Entry (PE) or remote start systems. Examples of relevant DTCs include:

Code	Description
B1A76-11	Remote Start Antenna Circuit-Circuit Short to Ground
B1A76-13	Remote Start Antenna Circuit-Circuit Open
B1A71-13	Passive Entry Antennas 1 Circuit Open
B1A72-13	Passive Entry Antennas 2 Circuit Open
B1A73-13	Passive Entry Antennas 3 Circuit Open
B1A74-13	Passive Entry Antennas 4 Circuit Open
B1A75-13	Passive Entry Antennas 5 Circuit Open

These codes indicate potential electrical problems within the antenna circuits crucial for RKE and passive entry functionality. For example, a 2023 Jeep Wrangler RKE B1A76-11 code points directly to a short in the remote start antenna circuit.

Diagnosis and Repair Overview

The diagnostic process outlined in TSB S2408000015 Rev. C begins by checking for any stored DTCs related to the Passive Entry or remote start systems. If codes such as B1A76-11 are present, they serve as a primary guide for troubleshooting antenna-related issues.

If no DTCs are found, technicians are instructed to verify that both key fobs are properly programmed to the Radio Frequency Hub Module (RFHM) using a scan tool. If a new or additional OEM key fob is being introduced and has an issue, the appropriate programming procedure must be followed to pair it with the vehicle.

For existing key fobs that are already programmed but still exhibit problems, further steps are required before considering a key fob replacement:

1. Key Fob Battery Check: The coin battery inside the key fob should be removed and its voltage verified with a voltmeter. If the voltage is below 2.6V, the battery must be replaced.
2. Signal Performance Test: The key fob's remote signal and battery performance should be tested using an ATEQ VT56 tester. This also involves evaluating the RKE performance at various distances and vehicle parking locations to ensure consistent operation.
3. Interference Check: Technicians must inspect the vehicle for any aftermarket LED light installations, both external and internal, as these can interfere with the RKE signal.
4. Location-Specific Issues: It's important to confirm that intermittent RKE operation is not confined to a single location, which could indicate external interference rather than a vehicle fault.
5. RFHM Programming: If the RFHM has been upgraded to support remote start, proper programming procedures, as detailed in the Service Library (SL) – 08 Electrical /8N – Power Systems / Power Locks / Transmitter, Integrated Key Fob / Standard Procedure, are essential for correct system function and warranty.

Important Warnings for Owners

It is crucial for owners to understand that this document is a manufacturer communication intended for technicians. It "does not authorize warranty repairs" and "does not provide any conclusions about what is wrong with the vehicle." Instead, it serves as a guide based on past experiences. The technician is responsible for the final diagnosis and appropriate course of action. If a solution is not found, technicians are advised to contact the STAR Center or Technical Assistance Center.

Owner Action

If your 2021-2024 Jeep, RAM, or Dodge vehicle is exhibiting any of the described RKE system malfunctions, such as "Remote Keyless Entry (RKE) Functions Do Not Work" or intermittent response, or if you suspect a specific fault like the 2023 Jeep Wrangler RKE B1A76-11, it is recommended to schedule an appointment with an authorized dealership. Be prepared to describe the symptoms in detail, including when and where they occur. While this TSB provides diagnostic steps, the ultimate repair and any associated costs will be determined by the dealership based on their diagnosis.

Source: NHTSA ID 11004151