2007 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 256

If the transmission continues to operate above 265°F (130°C), contact your nearest dealer or the GM Roadside Assistance Center. See Roadside Assistance Program on page 640. Notice: If you drive your vehicle with the transmission temperature gage above normal operating range, you can damage the transmission. This could lead to costly repairs that would not be covered by your warranty. Do not drive your vehicle while the transmission temperature gage reading is above normal. See your dealer for service. The following situations can cause the transmission to operate at higher temperatures: • Towing a trailer • Hot outside air temperatures If the transmission is operated at higher temperatures on a frequent basis, see Scheduled Maintenance (Gasoline Engine) on page 615 for the proper transmission maintenance intervals. Malfunction Indicator Lamp Check Engine Light Your vehicle has a computer which monitors operation of the fuel, ignition, and emission control systems. This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The check engine light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. Hauling a large or heavy load Low transmission fluid level High transmission fluid level Restricted air flow to the radiator and the auxiliary transmission oil cooler, if equipped. A temporary solution to reduce hotter transmission operating temperatures may be to let the transmission cool down. 256