08-28-2024, 10:55 AM
Got a P0128 code on my Jeep Grand Cherokee, which I believe is related to the coolant thermostat. How big of a deal is this? I’ve seen everything from “it’s just a sensor” to “your engine’s about to overheat.” Can anyone shed some light on what I should do next? I’m comfortable with basic repairs, but I’d rather avoid a full-on DIY disaster if this is more serious.