what cause it too do this

Asked by DENNISfarmer Mar 26, 2020 at 06:20 AM about the 2005 Chevrolet Impala LS FWD

Question type: Maintenance & Repair

code P0128 COOLANT THERMOSTAT , COOLANT TEMPERATURE BLOW
THERMOSTAT REGULATING.     HOW TOO FIX IT?????

1 Answer
2,260

RickMN answered 4 years ago

The most common fix is to replace the thermostat. The computer is expecting the engine to warm up at a certain rate based on intake air temp and RPM. If the engine takes longer to heat up it often sets this trouble code. It can also be a bad coolant temp sensor, but 90% of the time is a bad thermostat that's sticking open.

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