My vehicle (2019 Challenger Scatpack) just threw a code (P0128). I installed a 180 degree thermostat about 8 months ago, and have had no problems until yesterday. As I understand it, the code is for "vehicle not getting up to temp within a specified time frame". I live in South Florida, and it was 82 degrees outside, and my vehicle was already over 180 degrees when the light came on. Car seems to be heating up and cooling normally, So I don't think its a thermostat. This seems odd. Does anyone have any idea why this would happen? I also am unable to clear the code myself, since the PCM is locked.