Question about 2002 Chevrolet Malibu
This code has set twice and if you read the freeze frame data coolant start temp goes to 255 inlet air temp goes to -38 and coolant temp goes to 38 this happenes for about 10 frames then all goes back to normal
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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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