DTC P0128 2007 Jeep Grand Cherokee 5.7 low temp thermostat

[07Overland]

Hi Mike,

I installed a Mishimoto 180 low temp thermostat, Mopar coolant + 1 bottle Lucas Super Coolant, and am getting DTC P0128.
I logged data while driving and the code only trips when the engine temp gets below 170 while driving. (It is 78 degrees today and engine is 173-176 degrees driving; up to 196 degrees idling.)

I see that you are able to fix the P0128 issue, if I send you my last tune can you fix for me?
We have sub-zero temps in winter, what is the lowest temp you adjust to so P0128 doesn't trip?

Also, it would be great if you enable thermostat adjust in the inTune: I realize that may take away custom tuning shops, but a low temp thermostat is such a great weekend project (generally less than $75 bucks for all parts and fluids and only an hour wrench time) that I would appreciate being able to modify with inTune on the fly.

Thank you,
David

[mikel]

post the tune please.

[07Overland]

Hi Mike,

Thank you for the prompt response.
Please see PCM_05187053AH_LastTuneWritten.drg attached.

David

[mikel]

Hi Mike,

Thank you for the prompt response.
Please see PCM_05187053AH_LastTuneWritten.drg attached.

David

here you go.

[07Overland]

Awesome, thank you very much.

Do you mind if I ask how you fix on your end:
Do you adjust the temperature that trips the code?
Or do you make the tune ignore the parameter all together?

[mikel]

just raise the thrershold for setting the code.

[07Overland]

Ok great, thanks again for your help.

Your prompt feedback is some of the best client/customer support I've ever encountered.

[07Overland]

Hi Mike,

I purchased the diablosport from autoanything for my 2007 Chevrolet Trailblazer SS and am going to put a low temp thermostat in, if not too much trouble can you do the tstat fix on my tune?

Please see attached
ECM_12612850_LastTuneWritten.grg
TCM_24234613_LastTuneWritten.grg

Thank you,
David

[mikel]

Hi Mike,

I purchased the diablosport from autoanything for my 2007 Chevrolet Trailblazer SS and am going to put a low temp thermostat in, if not too much trouble can you do the tstat fix on my tune?

Please see attached
ECM_12612850_LastTuneWritten.grg
TCM_24234613_LastTuneWritten.grg

Thank you,
David

this thread is in reference to an issue with Chrysler vehicles, never been an issue on any GM I see....

[07Overland]

My apologies I though I started a new thread.
Thank you for following up. Will let you know if I get a temp error with the new low temp thermostat on the GM.

[07Overland]

Hi Mike,

My 2007 Jeep Grand Cherokee 5.7 is stalling while driving in cold weather.

You helped with t-stat fix on a tune but in trouble shooting the stalling I had to uninstall the aftermarket throttle body and put back stock.

Two questions:
1. Are there other temperature sensors or parts that have to reach a certain temperature car that will shut down engine?
2. With the new throttle bottle, if I re-submit the tune can you re-post with a lower t-stat over ride? (trying to trouble shoot before taking to dealer and thought that since the old tune w/ the t-stat fix was on the old throttle body a brand new tune w/ t-stat fix may fix overall-- also i logged data and got car to shut off while parked if you're interested.)

Many thanks,
David