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Anyway, here are the weird things I have seen:
1) Changed my oil and did the reset on the reminder, but the oil reset would not "hold". It looked like it cleared out, but on later toggle thru of the gauges it would be back at 8%.
2) Changed the fuel filter after I first disconnected battery. No leaks and the car started like normal. But on test drive a few DIC readings were off. Actually, the oil change was at 8% again, but it accepted the reset and now reads 100%. However, 3 of the tire PSI readings are blank.
Looking for ideas, etc. (and will pull codes sometime tomorrow .....
If you can not reset the olm through the dic, try turning on the key but do not start the car. Push the gas pedal to the floor three times and turn key off. This is a standard method for GM cars.