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This article replaces the one posted in December 2015 to extend the article?s shelf life. The issues covered are still being addressed. Are you reading a DTC B121E (climate control unit lost communication with touch control panel) on the HDS and you can?t find anything in the service information to help you troubleshoot it? Just use the troubleshooting procedure for DTC U0180 (lost communication with auto L/T); it?s the one you want.