P0128 Coolant Temperature Below Thermostat Regulating Threshold: Why This Code Matters More Than You Think
P0128 is easy to dismiss. The car drives fine. The engine seems normal. The only clue is the check engine light and a code that says the coolant temperature is below the thermostat regulating threshold. It sounds like a sensor issue at worst. But what P0128 is actually telling you is that your engine is […]
P0430 Catalyst System Efficiency Below Threshold Bank 2 on GMC Sierra: Right Side, Real Diagnosis
Your GMC Sierra is showing P0430, and the first thing to clarify is which side of your truck this code refers to. Bank 2 on the Sierra V8 is the passenger side of the engine, and the catalytic converter on that side is what the ECM is flagging as inefficient. P0430 is the Bank 2 […]