If you are getting only 11.5 volts on the battery, yes replace the battery. NOTE: these are regular automotive batteries, so you can take out your old battery (NOTE the location of the battery terminals), and go to any automotive parts store and MATCH the battery, I think these are 24F (BUT CHECK), replace the battery and see if the code clears. We got a low voltage code (46 I think) when the battery was failing.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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