OBDII Code List > P0128 SATURN
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P0128 SATURN
P0128 SATURN - Coolant Thermostat Malfunction
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Possible causes
- Insufficient warm up time
- Low engine coolant level
- Leaking or stuck open thermostat
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
- Faulty engine coolant temperature sensor
- Low engine coolant level
- Leaking or stuck open thermostat
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
- Faulty engine coolant temperature sensor
Tech notes
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 SATURN Description
Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
SATURN Technical Service Bulletins for P0128 code
2006 SATURN ION ENGINE AND ENGINE COOLING:ENGINE Details
2002 SATURN L-SERIES ENGINE AND ENGINE COOLING Details
2002 SATURN VUE ENGINE AND ENGINE COOLING Details
2003 SATURN L-SERIES ENGINE AND ENGINE COOLING Details
2003 SATURN VUE ENGINE AND ENGINE COOLING Details
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