download Tests/Procedures: Potential Causes: Tech Tips: Diagnostic Codes: 1. Replace the thermostat and test drive to see if the code returns. Thermostat This code indicates the engine has not reached a set temperature based on engine run time. P0128 Reported Fix Details 2003 Chevrolet Trailblazer, 4.2L * Replaced Engine Thermostat – We replaced thermostat (with [...]
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