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#1
12-08-2005, 03:35 PM
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02 Sonoma service engine soon lite
Code PO128 kept coming up.Changed thermostat and will see what happens.Any other repair suggestions for this code??
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#2
12-16-2005, 11:40 AM
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po128 code, coolant temp was low...
P0128 - Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
I just added coolant to my zr2 and the temp is runing around 160+- when it usually runs @ 240+-. Is it safe to drive if coolant resivior is full? How do you clear this code? Do I need a new Tstat? Does it need to be cleared by a shop computer? Is it hard to change, if you are mechaniacally inclined) any help is much appreciated!  Matt
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#3
12-17-2005, 03:09 PM
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P0128 - Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
I just added coolant to my zr2 and the temp is runing around 160+- when it usually runs @ 240+-. If you added coolant, check for a leak Is it safe to drive if coolant resivior is full? YES, but see answer above How do you clear this code? You need a bi-directional scanner....you can try disconnecting the battery, but that doesn't always work Do I need a new Tstat? Possibly, but I would check for leaks first Does it need to be cleared by a shop computer? Answered that one already Is it hard to change, if you are mechaniacally inclined) No any help is much appreciated! You are welcome
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#4
01-01-2006, 07:31 PM
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first of all your temp is normal at 160
240 is not you can also clear codes by pulling the ecu fuse. my truck had this code before I cleared it and it has not came back on. I have a scanner and it clears codes. I have not tried the fuse deal. if your temp is running at 240 you probably need a new thermostat. and make sure you have sufficiant coolant levels in the radiator and overflow tank.
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