po128 code

2007 GMC SIERRA
54,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BILL BENNETT
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  • 2 POSTS
My 07 gmc pickup has a po128 code comeup. What is the problem?
Aug 15, 2011 at 8:47 PM
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RASMATAZ
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P0128 Coolant Temperature below threshold

Check and test the thermostat and coolant temperature sensor-
Aug 15, 2011 at 9:02 PM
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BILL BENNETT
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  • 2 POSTS
Thank you I will do that
Aug 15, 2011 at 9:05 PM
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