Is your Dodge Dart key fob suddenly refusing to cooperate? It can be incredibly frustrating when your key fob stops working, leaving you locked out or unable to start your car remotely. While it might seem like a simple issue, a non-responsive key fob can stem from a few different causes, with one common culprit in Dodge Darts being the Radio Frequency Hub Module (RFHM).
Understanding the RFHM and Key Fob Issues
The RFHM is a critical component in your Dodge Dart’s keyless entry and ignition system. It’s responsible for communicating with your key fob, allowing you to lock and unlock your doors remotely, activate the panic alarm, and even start your car if you have remote start. When your key fob isn’t working, especially if it’s not a simple battery issue, the RFHM is often the first suspect.
According to expert sources, including factory service manuals, a failing RFHM is a likely cause for key fob problems in Dodge Darts. The RFHM is located in the vehicle, specifically “under the top of the rear seat back trim.” If this module malfunctions, it can disrupt communication with your key fob, leading to a non-working remote.
Diagnosing the Problem: Is it Really the RFHM?
Before jumping to RFHM replacement, it’s wise to rule out simpler issues. Here are a few basic troubleshooting steps:
- Check the Battery: This is the most obvious and easiest fix. A dead battery in your key fob will certainly prevent it from working. Try replacing the battery with a fresh one of the correct type.
- Try Your Spare Key Fob: If you have a spare key fob, test it. If the spare works, then the issue might be with the original key fob itself, not necessarily the RFHM.
- Check for Interference: Radio frequency interference can sometimes disrupt key fob signals. Try moving to a different location away from potential sources of interference like radio towers or strong electronic devices and see if your key fob starts working.
If you’ve checked these basic steps and your Dodge Dart key fob is still not working, then a faulty RFHM becomes a more probable cause.
Replacing the RFHM: What You Need to Know
Replacing the RFHM is not a simple DIY task and typically requires specialized tools and knowledge. According to factory service manual procedures, here’s a general overview of what’s involved:
- Diagnostic Scan Tool: You’ll need a professional-grade diagnostic scan tool to communicate with your Dodge Dart’s computer system.
- DealerCONNECT and PIN: Programming a new RFHM often requires accessing DealerCONNECT, the official Chrysler/Dodge/Jeep/Ram diagnostic system, and obtaining a temporary PIN (Personal Identification Number). This PIN is security-related and usually dealer-specific.
- RF-HUB Replace Routine: Using the scan tool, you need to navigate to the RF-Hub (RFH) module and perform the “RF-HUB Replace” routine. This initiates the process of installing and configuring the new module.
- PROXI Configuration Alignment: After replacing the RFHM, a “PROXI Configuration Alignment” routine is necessary. This synchronizes the new module with the rest of your vehicle’s electronic systems.
- Key Fob Programming: Once the RFHM is replaced and configured, you’ll need to program your key fobs to the new module. This involves a specific procedure using the scan tool, often requiring you to place the key fobs in a specific location within the car and press buttons as instructed by the scan tool.
Important Notes from the Factory Service Manual:
- Avoid placing laptops or wireless devices near the center console during the programming process, as the RKE antenna is located there and interference can occur.
- When programming key fobs, you may be prompted to “Press the Unlock button.” It’s crucial to press it quickly and only once, not hold it down.
DIY Option: Exploring alfaOBD
While the official procedure often points to dealer involvement, there might be a potential DIY route using a third-party diagnostic tool called alfaOBD. According to discussions in online forums, some users have successfully replaced the RFHM on similar vehicles (like RAM trucks) using alfaOBD and a 4-digit PIN.
If you are considering this DIY approach, research the compatibility of alfaOBD with the Dodge Dart RFHM specifically. You may also need to source the 4-digit PIN, which some apps or services claim to provide, potentially avoiding a dealer visit for this step. However, proceed with caution and understand the risks involved if you are not experienced with automotive diagnostics and programming.
Conclusion: Getting Your Key Fob Working Again
A non-working Dodge Dart key fob can be a major inconvenience. While simple issues like battery replacement should be checked first, a failing Radio Frequency Hub Module (RFHM) is a likely culprit. Replacing the RFHM typically involves professional diagnostic tools and potentially dealer programming. However, DIY options like alfaOBD might be explored with caution.
If you’re uncomfortable with DIY car repairs or diagnostics, it’s always best to consult a qualified mechanic or your Dodge dealership. They have the expertise and equipment to accurately diagnose the problem and perform the necessary repairs to get your key fob working reliably again.
