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P0128 Error Code

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Old 07-30-14, 12:17 PM   #1
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Default P0128 Error Code

Hi Everyone,

I have been getting a P0128 pretty often lately. It doesn't stay on all the time, sometimes it does go away and comes back. This is the only error code I get when I look up the Check Engine Light.

Based on the error code, I assume its either the Thermostat or the Coolant Temp Switches.

With the car cool, I remove the radiator cap and start the car. The coolant does not flow. I just slow rises after a while. Based on this, I assume the Thermostat is not stuck wide open.

I'm going to test the 2 Coolant Temp Switches. I know the #1 CTS is located at the bottom of the radiator. Can anyone show me a picture of where the #2 CTS is located?

Anyone have an idea what might cause this error code?
Any other troubleshooting ideas?

Thank you.
chopstick8 is offline   Reply With Quote
Old 07-30-14, 03:08 PM   #2
Join Date: Apr 2001
Location: Austin, TX
Posts: 9,610

Please post the behavior of temp gauge.

If the thermostat is stuck open, then it would take abnormally long time to get to the middle of the gauge.

salimshah is offline   Reply With Quote

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