Code PO128

Tiny
CAT619
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 3.4L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
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?
Tuesday, October 8th, 2019 AT 10:30 PM

1 Reply

Tiny
SCGRANTURISMO
  • 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
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Tuesday, October 8th, 2019 AT 10:41 PM

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