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Old 01-17-2024, 04:43 PM   #1
RePete222
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Join Date: Feb 2005
Location: Omaha, Nebraska
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Question 2020 GC "Stop/Start Unavailable. Service Stop/Start System" after main battery change

Hello, I changed the main battery in my 2020 GC Limited earlier this week (did not change auxiliary ("sidecar") battery). Now I'm getting the message "Stop/Start Unavailable. Service Stop/Start System", and a yellow light on the dash consisting of the Stop/Start icon with an exclamation point next to it, every time I start the engine.

Is it possible that the aux battery also needs to be replaced? Would that be a possible cause of this message? Turning off the stop/start system with the console button doesn't make the yellow light go away.

Having changed the main battery in a VERY COLD garage (outside temps were in the subzero teens), I'm planning to wait for warmer weather here in Omaha before dealing with the aux battery.

Thanks

Last edited by RePete222; 01-17-2024 at 09:47 PM. Reason: corrected wording of message
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auxiliary , stop/start , warning
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