If your going into limp mode after the update, go to another dealer. If the knock sensor detects knocking the vehicle is put into limp mode. The dealer is fully aware of this . Look at post #6 second page in yellow.Little late to the party but... Ive had my 14 Forte Koup updated and have had NOTHING but issues. KIA believes the engine is "fine" but it keeps tripping into limp mode after the update..frustrating when a seven year old vehicle with 45k miles is now unable to be used to its fullest extent.
A modern car typically doesn't go into limp mode without throwing codes. Your CEL should be lighting up when it happens. Do you have an OBD2 code reader? I don't trust dealers. I've found that they gloss things over, won't provide detailed information and sometimes just straight-up lie about stuff. One thing I do miss coming from a Dodge Dart to a Forte is the AlfaOBD software. It allows you to read the fault codes from every module, whether or not the fault triggered a CEL, but it only works on FCA vehicles. It actually allows you to pull more information from the car than the official dealer tech scan tool, which hides information that engineers don't think technicians need to see.Engine runs flawlessly , dealer did open a tech ticket in which corporate asked for live video to be taken while engine was run through its cycles. They could see no signs of knock or abnormal piston movements. Ill bring up the possibility of piston slap though. Knock sensor was also replaced at no cost so its possible.