The contact owns a 2015 Kia Soul. The contact stated that the check engine warning light was illuminated intermittently. The contact received notification of NHTSA Campaign Number: 19V120000 (Engine, Engine and Engine Cooling); and the Catalytic Overheating Protection Engine Control Unit logic was updated to prevent overheating of the catalytic converter. After the recall repair was completed, the failure persisted. The contact took the vehicle to a certified mechanic, who diagnosed that the catalytic converter needed to be cleaned. The vehicle was not repaired. The check engine warning light remained constantly illuminated. The manufacturer was not informed of the failure. The failure mileage was 115,000.