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U1016 Loss of Communications with PCM U1055 Loss of Serial Communications for Class 2 Devices
This is going to require special testing with a GM scanner, it is not a do it yourself repair. My guess is this you have a defective instrument cluster display
U codes are a communication problem between computers. They will usually turn on a light in the dash for the area to look at. IE.. ABS,Check engine,Security... Some wont turn a light on, BCM..U codes can come from disconnecting the battery or the battery gets to low on voltage. (like a bad alternator) Last but not least would be a short or broken wire in the communications line. Depending on the year, communication lines were from computer to computer. Newer models splice the commuication lines into one place that feed all the computers.
If you are asking how to fix a serial commuication link failure on your 2003 Kia Sorento, you must first have access tothe proper scan equipment that is programmed with the correct software for your vehicle to acess all of the several modules that are linked to your onboard communications network. This is necessary to determing which modules are able to communicate and which modules cannot, so the location of the failure can be determined.
CS320 polygon motor (laser), you will need to replace it, it is not expensive! CS672 control communication on start up, to many options, from circuit board to bad connection, you will need a tech for this.