I have an error message on my display that says RTA 2 battery low. What is that? on 2003 Chevrolet Avalanche 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
It occurs every time I start my truck
(1) Answer
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ck batteries in remote transmitter
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