2005 GMC Canyon Owner's Manual - Page 107

Notice: Shifting to REVERSE (R) while your vehicle is moving forward could damage the transmission. The repairs would not be covered by your warranty. Shift to REVERSE (R) only after your vehicle is stopped. Use REVERSE (R), along with the parking brake, for parking your vehicle. While you accelerate, it is normal for the light to go on and off if you quickly change the position of the accelerator. Ignore the shift light when you downshift. If your vehicle has four-wheel drive and is equipped with a manual transmission, disregard the shift light when the transfer case is in four-wheel low. For more information, see Up-Shift Light (Manual Transmission) on page 3-28. Up-Shift Light This light will show you when to shift to the next higher gear for best fuel economy. Shift Speeds {CAUTION: If you skip a gear when you downshift, you could lose control of your vehicle. You could injure yourself or others. Don't shift down more than one gear at a time when you downshift. When this light comes on, you can shift to the next higher gear if weather, road and traffic conditions permit. For the best fuel economy, accelerate slowly and shift when the light comes on. 2-25