GM Service Manual Online
For 1990-2009 cars only

If the vehicle does not have a Driver Information Center (DIC):

  1. Turn the ignition to ON, with the engine off.
  2. Fully press and release the accelerator pedal slowly three times within five seconds.
  3. Turn the key to OFF.
  4. If the CHANGE ENGINE OIL SOON message comes back on when you start the vehicle, the engine oil life system has not reset. Repeat the procedure.

If the vehicle has a DIC:

  1. Turn the ignition to ON, with the engine off.
  2. Press the MODE button until the DIC reads OIL LIFE LEFT/HOLD SET TO RESET.
  3. Press and hold the SET button until 100 percent is displayed.
  4. You will hear 3 chimes and the CHANGE ENGINE OIL SOON message will go off.

  5. Turn the key to OFF.

If the CHANGE ENGINE OIL SOON message comes back on when you start the vehicle, the engine oil life system has not reset. Repeat the procedure.