Question about 2002 Buick LeSabre
This code is triggered because your cooling system temperature is out of range for the designated time frame that the computer is monitoring it for. Check your coolant level and if the level is correct than you need to replace the thermostat. This should fix your light issue.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
Follow your upper radiator hose to the motor. It will be clamped to your thermostat housing. Unscrew the 2 or 3 bolts holdng the housing down and your thermostat will be right there. Replace thermo. and gasket then reaffix housing and hose. LET MOTOR COOL DOWN BEFORE CHANGING and hour+!!
Posted on Jun 12, 2009
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature.)
Meaning the regulating temperature is higher than the themostat cooling temperature . you may have to replace the Coolant sensor again. or maybe both. Sorry !
Posted on Jan 06, 2010
May be a faulty thermostat or the thermostat sensor. Change the thermostat first it's a lot cheaper, unplug the neg battery terminal for 10 minutes to allow the code to erase and check it again. Good luck
Posted on Mar 02, 2010
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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.
A code P0128 may mean that one or more of the following has happened:
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:
I hope this helps a bit!
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