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I think those COULD be ECU engine misfire codes with an extra 00 added to it. I see that some manufactures add another 00 to their codes, as perI have a 2019 kona 1.6t and my wife was driving home from work when the engine light came on. Luckily, blue link picked it up and I called service to schedule a time to bring it in. It looks like DTC codes from blue link logged P030200, P030400, P030000, and P030100 codes. Anyone ever come across this issue? I hope it's not engine or tranny failure. Thanks for all feedback.
ECM-P030400 - Volvo Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis
ECM-P030400 Volvo Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis

https://www.reddit.com/r/veloster/comments/habig1
NORMALLY Hyundai has the industry standard P0 3020 (your first #) as a engine ignition misfire on cylinder #2.
Your P0300 would be a
P0300 - Hyundai Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis
P0300 Hyundai Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis

Do you have a piggyback tuning box on your car, or have an after market tune on your ECU? Have yourself just changed sparkplugs, or had a NON Hyundai dealer/auto repair shop change plugs?
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