got a code today: P0128
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Senior Member
Joined: Nov 2006
Posts: 474
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From: ludlow,PA
got a code today: P0128
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
got this on the way to work today. it was 19 degrees outside. what does this mean? anything to worry about or check besides antifreeze level? it seems like its hard to get the truck up to normal operating temps unless im climbing hills or have a load on the motor (im talking about the 1/4 way mark)? not sure what thermostat is in the truck.
got this on the way to work today. it was 19 degrees outside. what does this mean? anything to worry about or check besides antifreeze level? it seems like its hard to get the truck up to normal operating temps unless im climbing hills or have a load on the motor (im talking about the 1/4 way mark)? not sure what thermostat is in the truck.
Senior Member
Joined: Feb 2010
Posts: 458
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From: latrobe, pa
Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
possible causes -
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor
Malfunctioning CHT sensor
possible causes -
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor
Malfunctioning CHT sensor
Technical Article Contributor
Joined: Apr 2009
Posts: 10,697
Likes: 14
From: In the fast lane from LA to Tokyo...
Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
possible causes -
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor
Malfunctioning CHT sensor
possible causes -
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Malfunctioning ECT sensor
Malfunctioning CHT sensor
Derived from CHT senser....
Technical Article Contributor
Joined: Apr 2009
Posts: 10,697
Likes: 14
From: In the fast lane from LA to Tokyo...
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
got this on the way to work today. it was 19 degrees outside. what does this mean? anything to worry about or check besides antifreeze level? it seems like its hard to get the truck up to normal operating temps unless im climbing hills or have a load on the motor (im talking about the 1/4 way mark)? not sure what thermostat is in the truck.
got this on the way to work today. it was 19 degrees outside. what does this mean? anything to worry about or check besides antifreeze level? it seems like its hard to get the truck up to normal operating temps unless im climbing hills or have a load on the motor (im talking about the 1/4 way mark)? not sure what thermostat is in the truck.
