However, you *can* usually reset the *displayed* oil life percentage after an oil change using one of these methods:
* Gas Pedal Method (Most Common): Turn the ignition to the "ON" position (don't start the engine). Then, repeatedly press the gas pedal to the floor three times within 10 seconds. Turn the ignition to the "OFF" position. Start the engine and see if the oil life monitor has reset. This method's effectiveness varies depending on the vehicle's specific software.
* Using a Scan Tool: A professional-grade OBD-II scan tool can often reset the oil life monitor. This is the most reliable method. Many auto parts stores will perform this service for free.
* Manual Reset (Least Likely): Some older vehicles have a manual reset procedure involving specific button combinations on the instrument cluster. The 2003 Envoy is less likely to have this, but check your owner's manual to be sure.
Important Considerations:
* The most crucial part isn't resetting the percentage; it's changing your oil according to the manufacturer's recommended schedule. Don't rely solely on the oil life monitor. Severe driving conditions (towing, frequent short trips) may require more frequent oil changes than the monitor suggests.
* Check your owner's manual: The manual is the best source of information for your specific vehicle. It might detail a specific oil change interval or a reset procedure.
If neither the gas pedal method nor a scan tool works, your best bet is to consult a mechanic or GMC dealership. They'll have the tools and knowledge to reset the system accurately.
