DTC U1100: Lost Communication With ECM (Reception Error): DTC Detecting Condition
WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara, 2007 Suzuki Grand Vitara, and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Reception error of communication data for ECM is detected more than specified time continuously.