leochevy2001

iTrader: (6)

on my way to work this morning and as i exit the freeway my ses light comes on. it's dark out and so i wait to hook up the tuner to read the code. about 30mins ago i checked it out and the code was p0128.

p0128 - insufficient ambient temperature (ect) engine coolant temperature

could someone let me know what this means. i changed out my waterpump new year's weekend and switched out my t-stat to a 180* t-stat. i am in the process of replacing the fan clutch too.

SSlow 4.8

iTrader: (4)

could just be the engine temp sensor on the block.. probably not a big deal. You arent overheating or anything are you?

OUT2WIN

iTrader: (1)

I just had that code on my wife's 02 grand prix. The thermostat was staying wide open. It would not even build up past 180*. I had just put a new waterpump and thermo so I guess it was a faulty one. It also took about 400 miles to recognize and to trip the SES light.

leochevy2001

iTrader: (6)

no, it's not over heating at all. the gauge stays right in between 160 and 210.

leochevy2001

iTrader: (6)

i don't have a way to log my coolant temps so i can't say what they are actually reading. i just know that the gauge stays right in between the 160 and 210 marks. i felt like that was odd since a lot of people that put 180* t-stats say their temps don't change. just like you, it has taken about 400-500 miles for the ses light to come on so i am not really sure what it could be.

could my problems be from my programmer not agreeing with the 180* t-stat?

ridnlow

iTrader: (5)

Not sure if this will help or not, but it looks informative

http://gearchatter.com/viewtopic9378...b600a180b44980

budhayes3

iTrader: (19)

Maybe the t-stat is stuck open, or could there have been an air pocket and the coolant is low? There's also a possibility that the coolant temp sensor got some debris (such as RTV, etc.) on it, giving the PCM false readings.

leochevy2001

iTrader: (6)

how can i tell if the t-stat is stuck open? the coolant doesn't look low and i thought that i got all the air out of the system.

SSlow 4.8

iTrader: (4)

squeez that upper tube to move the fluid around and you should be able to hear that little metal ring on the thermo moving around... if its stuck open than i dont think it'll make that sound.... well at least it didnt make that sound when mine was stuck open

leochevy2001

iTrader: (6)

did you do this with the motor running?