2001 GMC Jimmy thermostat or sensor? PO128

Tiny
SABBATH171982
  • 2001 GMC JIMMY

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2001 GMC Jimmy 6 cyl Two Wheel Drive Automatic 73K miles

My engine light came on about 3 days ago. It gave me a troubleshooting code PO128 "coolant temp is always low" I am running a few degrees cooler, my coolant level is fine. Would I replace the thermostat first or the Engine coolant temperature sensor? I have both on hand.

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Saturday, December 15th, 2007 AT 9:05 AM

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