Category: General Motors

GM P0128 – Meaning, Causes, Symptoms, & Fixes

GM Code P0128 Definition Coolant thermostat temperature below regulating temperature GM  Code P0128 Meaning The powertrain control module (PCM) tracks how long it takes for the engine of your GM to reach and maintain the correct operating temperature. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter “closed...

P0128
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