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Old 12-16-2007, 12:10 PM   #1
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Default Check Engine Code p0128

2002 Bonne 130,000+ miles. Original Stock Tstat.

I guess from what I can gather on here that this code is generally fixed by installing a new Tstat correct? I have already replaced the temp/coolant sending unit.

Is a factory 195 tstat fine or should a guy go aftermarket with a 180? If so, someone have a good site or part number to purchase?

Anything else that this code sometimes points to?
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Old 12-16-2007, 01:34 PM   #2
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DTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Tsat is the most likely culprit. Does the 2002 have two temperature sending units?
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Old 12-16-2007, 01:46 PM   #3
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Should be only one two elements in it. One for the PCM, one for the gauge.
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Old 12-16-2007, 01:49 PM   #4
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I just got that code too, is it possibly cause I have a 180 and with it being so cold its just not getting up to temp the pcm wants.
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Old 12-16-2007, 03:37 PM   #5
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Quote:
Originally Posted by willwren
Should be only one two elements in it. One for the PCM, one for the gauge.
For future reference what year did they go to a single unit?
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Old 12-16-2007, 03:57 PM   #6
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Should be all Series 2. But even the 95 Buick Riv L67 (Series 1) had a dual-element single sensor, and the other LIM sensor hole has a brass plug.
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Old 12-16-2007, 10:15 PM   #7
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My drilled 180 took me through all of last winter without an issue. This year, it'* already throwing that code...even after I put the sight shield back on. Looks like I'll be swapping out to the 195 for the winter.
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