2003 Cadillac CTS Error code P0128
I've got a 2003 Cadillac CTS that shows the P0128 error code. I've read other posts but I am still unsure of just what needs to be replaced. I am not a experienced mechanic.
The car has a temp gauge. After the car has run for a short period the radiator cooling fans will come on low even though the temp gauge indicates the engine is only half its normal temp. The engine tends to continue to run just a bit cool though on a long drive the normal temp may be reached momentarily. It seems if the fans did not run all the time the temp may be normal.
I don't believe it is the thermostat, but could it be the ECT sensor? Would it not go bad such that it would read like the engine is cool, not hot? (I can test the sensor with an ohmmeter if I can find it!). I've read about the AIT sensor, could that be it? The weather has been very cold lately.
Any Help is appreciated!
Thursday, January 20th, 2011 AT 2:42 PM