![Any idea why I'm getting this code? Check engine light is on. What can cause this lol and what do I need to fix? 08 LMM : r/Duramax Any idea why I'm getting this code? Check engine light is on. What can cause this lol and what do I need to fix? 08 LMM : r/Duramax](https://preview.redd.it/lxdsltfcul961.jpg?auto=webp&s=d3a4620f7b135e33d1d3d831c456cb59f117e530)
Any idea why I'm getting this code? Check engine light is on. What can cause this lol and what do I need to fix? 08 LMM : r/Duramax
![OBD-II Trouble Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) OBD-II Trouble Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)](https://www.obd-codes.com/images/thermostat.jpg)
OBD-II Trouble Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
![P0128 Code: Coolant Temperature Below Thermostat Regulating Temperature - In The Garage with CarParts.com P0128 Code: Coolant Temperature Below Thermostat Regulating Temperature - In The Garage with CarParts.com](https://www.carparts.com/blog/wp-content/uploads/2021/06/vehicle-faulty-thermostat-part-replacement-1024x683.jpg)
P0128 Code: Coolant Temperature Below Thermostat Regulating Temperature - In The Garage with CarParts.com
![Need some thoughts- PO128 Thermostat Rationality Code- 2015 Dodge Charger Rallye SXT : r/MechanicAdvice Need some thoughts- PO128 Thermostat Rationality Code- 2015 Dodge Charger Rallye SXT : r/MechanicAdvice](https://i.redd.it/3y22kefzxpgb1.jpg)