HappySalesman

iTrader: (3)

Was driving my car on the freeway on a chilly night a few days ago when the SES light came on. Plugged the scanner in and it came up P0128. This makes sense since I have a 160 degree thermostat installed. My question is is there a table I can edit or some setting to recalibrate the PCM to the lower temp? Or is my only option to just set the DTC to No Error Reported?

Mike@Diablosport

iTrader: (2)

I've never come across this on a GM, but see it on Chryslers all the time.
On the Chrysler stuff there's a pair of scalars for min and max temp to enable t-stat test. You just jack those up to 190/191 (c) and it eliminates the issue.