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.
Symptoms
You will likely not notice any drivability problems other than the MIL
illumination.
Causes
A code P0128 may mean that one or more of the following has happened:
Possible Solutions
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:
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