NHTSA Complaint #11446088 — 2018 KIA SOUL

On 16 November 2021, Kia sent a letter for a Product Improvement Campaign to install software called "Knock Sensor Detection System" ("KSDS") on my 2018 Kia Soul Plus. The software update was installed on 4 December 2021. The 16 November letter noted that if KSDS detected a problem, the car would enter a limp home mode that limited engine RPMs to 1800-2000 RPM and the Malfunction Indicator Lamp ("check engine light") would blink continuously. On 17 December 2021, the check engine light started to blink continuously, and the engine RPMs never exceeded 2000 RPM. I took the car to the dealership on 18 December 2021. The car is not safely operable. The dealership told me that they needed technical assistance from the factory, which they have not yet received as of 3 January 2022. I'm reporting the issue because it appears to be related to the known engine manufacturing defects in Theta, Nu, and Gamma lines of engines, and that these issues persist beyond the 2011-2016 model years (for which a recall has already issued) and at least into the 2018 model year. Answers to questions: (1) powertrain/engine failure, possibly other system(s) (2) safety risk is known fire danger in Theta, Nu, and Gamma engines (3) dealer is currently diagnosing/confirming the issue (as of 1/3/22) (4) only dealer has inspected vehicle (as of 1/3/22) (5) no issues prior to 12/17/21, when Malfunction Indicator Lamp ("check engine light") started to blink continuously and engine RPMs were limited to 2000 RPM.