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I have a 2003 GMC Yukon XL and on the instrument panel when I start my engine an err-code reads RFA 2 Battery Low? What does that mean?

Vehicle: 2003 GMC Yukon XL

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RFA = Remote Frequency Actuation. The code is triggered when the key fob remote battery voltage is low. Replacing the key fob battery usually takes care of the problem.

https://www.autocodes.com/glossary/346/rfa.html
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the battery voltage in your remote is low, replace the battery in the remote.

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