OBD code reads po128 on my car MD reader what is it ?? on 2003 Saturn L200

Low mi. car 60.000 Wifes car where do I look first ect. Light just came on 3 days ago car has been setting 23 degree temps.is it ok to start and let it warm up ?

by in Lansing, MI on December 27, 2012
3 answers
ANSWER by on December 27, 2012
Most likely the engine coolant thermostat is stuck open and needs to be replaced. The fault code is due to engine coolant tempuature is staying too low.
ANSWER by on December 27, 2012
ANSWER by on December 28, 2012
1. Check for a possible code P0128 set in the Powertrain Control Module (PCM). 2. Check if the engine is taking a long time getting up to operating temperature, as if the thermostat was bad. 3. Try clearing the codes with the scanner anyway and see if the fans shut off. Tech Tips:With this code, the PCM will default the cooling fans You have a bad thermostat

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