Question about 2002 Chevrolet Malibu
Ashart81 : where do you get the code P0128 from? I have a check light steady and cannot get solution. thanks
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature
REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE, 190-195 DEGREE'S FAHRENHEIT.
Posted on Feb 19, 2009
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Posted on Jan 02, 2017
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This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
A code P0128 may mean that one or more of the following has happened:
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
I hope this helps a bit!
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