2005 Pontiac GTO Owner's Manual - Page 81

After shifting to FOURTH (4), you may downshift to a lower gear if you prefer. Notice: Forcing the shift lever into any gear except FOURTH (4) when the 1 TO 4 SHIFT light comes on may damage the transmission. Shift only from FIRST (1) to FOURTH (4) when the light comes on. This light will come on when: Parking Brake • The engine coolant temperature is higher than 169°F (76°C), • you are going 15 to 19 mph (24 to 31 km/h) and • you are 21 percent throttle or less. See One-to-Four Shift Light (Manual Transmission) on page 3-26 and Trip Computer on page 3-33 for more information. To set the parking brake, pull up on the parking brake handle without pressing the release button. If the ignition is on, the brake system warning light will come on. See Brake System Warning Light on page 3-27. To release the parking brake, hold the regular brake pedal down. Pull the parking brake handle up until you can press the release button. Hold the release button in as you move the brake handle all the way down. Notice: Driving with the parking brake on can overheat the brake system and cause premature wear or damage to brake system parts. Verify that the parking brake is fully released and the brake warning light is off before driving. 2-23