Question about 2003 Cadillac CTS
Check engine light on. When it was running, it had sputtering and ruff acceleration. Autozone code read P0128 relating to the thermostat Could there be something else going on?
Temperature sending unit could be sending erratic signal.
Posted on Nov 22, 2013
Battery is dead
Posted on Nov 22, 2013
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Posted on Jan 02, 2017
A code P0128 may mean that one or more of the following has happened:
1-Low engine coolant level
2-Leaking or stuck open thermostat
3-Faulty cooling fan (running too much)
4-Faulty coolant temperature (ECT) sensor
5-Faulty intake air temperature (IAT) sensor
Check coolant level Check to make sure thermostat is functioning properly Check the Cooling fan Check the ECT sensor Check the IAT sensor If all else fails replace the thermostat
Posted on Jan 05, 2011
SOURCE: CTS CODE PO420
most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.
Posted on Jul 02, 2008
First off who ever said $400 to change a thermostat is trying to rip you off. The actual part is like $20 bucks max and its so easy to change. I can guide you through it if you would like.
The P0128 code is Coolant Thermostat Malfunction.
These are the possible causes for this code:
- Insufficient warm up time.
- Low engine coolant level.
- Leaking or stuck open thermostat.
- Malfunctioning engine coolant temperature sensor.
These are the possible quick fixes:
- Top OFF Engine Coolant
- Replaced Thermostat
Posted on Jan 15, 2011
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