P0128 (reposted from the other site)

[MAY03LT]

This happened back in August of 2011, reposting it here to build up the archives.

Coming home from Carlisle, the gauge was 2 ticks left of center.

No check engine light. A look into the DTC list revealed the P0128.

I watched the engine temp as it got to 180 degrees or so and stayed there.

After verifying that the coolant level was ok, I swapped out the thermostat.

Temp gauge back to "normal".

I kinda goofed here, I didn't take a pic with a shorter run time. It got up to 205-ish in a few minutes.

And there you have it. During the three or four days it took me to get the time to fix my own TB, I documented a 6mpg loss. Moral of the story - if you have a P0128, fix it!

 

[fishguy1123]

Can you please move to MI.????? That would be great! Thanks, sincerely 360 owners that live in MI.!!!!

 

[Mark20]

That 181F was about what I was seeing on my Scan Gauge when my T-Stat or temperature sensor went.

 

[MichEnvoyGuy]

I just wanted to add my piece. I dont know if its my truck or not, but Ive never run at anything above 195*f. I just replaced my t-stat (2nd time) & original ECT 2 months ago and the highest I get is 195* and only when Im stopped at a red light. Once I start driving it settles at 190*.

Edit: The temperatures are live temps taken from the ECT and read on my Equus 3130.

 

[JPZ]

Thermostat getting changed tomorrow. Mine is running a little cool with a CEL on.