Code PO128

120,000 MILES • 3.4L • 6 CYL • 4WD • AUTOMATIC
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CAT619
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  • 1 POST
PO128. Low temperature. Slow heater. Bad has mileage. Bought new OEM thermostat with seal. Should I get a new gasket? What kind of sealant do I use?
Oct 8, 2019 at 3:30 PM
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SCGRANTURISMO
  • ✓Experienced Mechanic
  • 4,897 POSTS
Hello,

This DTC is not a problem with your vehicle's thermostat. If anything it is a problem with your vehicle's Engine Coolant Temperature Sensor [ECT]. In the diagrams down below I have included the vehicle manufacturers diagnostic troubleshooting flowchart for DTC P0128. Please go through this guide and get back to us with what you find out.

Thanks,
Alex
2CarPros
Oct 8, 2019 at 3:41 PM
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