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No! there is nothing to reprogram. The sensors in the coolant system and the temp sensor for the fans dont need to have anything done to them. If you are not getting any check engine light, you are good.
The person running the test is an idiot. The OBDII test instrument is not capable of determining if there is a warning lamp failure. It is probably guessing based on voltage level, but lamp resistance does normally vary. The test is supposed to be done visually. Take it to someone else, and they will probably be more competent and pass your car.
Ah the famous P0128.....It's 1 of 2 things. If your fan is not engaged constantly (would sound like an airplane or big rig everytime you step on the gas) and is working properly, that rules out the fan clutch. The other common problem is the thermostat. Replace the thermostat and the code will go away. Engine temperature needs to be at 210 degrees on these engines. If the fan clutch is constantly engaged, it's cooling the engine off constantly and won't get up to 210 fast enough. If it's the thermostat, it's stuck open and isn't allowing the coolant to properly heat up in time.
You'll find that this is actually your thermostat, not the actual sensor itself. Your thermostat is sticking open causing it to run too cool. Replace the thermostat, and that light will go out. I went a year with this problem, replaced the sensor twice, light would still go on. The bad thermostat was causing bad readings by the sensor. Very common problem for Envoys and Trailblazers.
Need to check to see if the blower motor is running.If it is,but not threw the vents,most likely a vent door actuator motor.The actuator motor in this case would be bad,it is hard to get to,unless you are mechanically inclined,You can do it your self.If the blower motor is bad,just replace it.Check fuses first,and the blower relay.If I can help,let me know.
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.
This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.
Replace the wire harness:
Part Number 89024920 Description Harness Assembly, Engine Cooling Fan Wiring
You should check with a scanner to retrive the codes the PCM register,depending the code you can either send the vehicule to a mecanic or to a GM dealer for repair.Do not desconnect the battery anymore or you'll loose all the PCM codes and it will be difficult to find the exact problem.luck!