GM Service Manual Online
For 1990-2009 cars only

Your speedometer lets you see your speed in both miles per hour (mph) and kilometers per hour (km/h).

Your odometer shows how far your vehicle has been driven, in either miles or kilometers.

Your vehicle has a tamper-resistant odometer. You may wonder what happens if your vehicle needs a new odometer installed. If the new one can be set to the mileage total of the old odometer, then that will be done. If it can't, it will be set at zero and a label must be put on the driver's door to show the old mileage reading when the new odometer was installed. If the mileage is unknown, the label should then indicate "previous mileage unknown".

Trip Odometer

Your trip odometer shows how far your vehicle has been driven since the trip odometer was last reset. To reset the trip odometer to zero, press and hold the trip/reset button for about two seconds.