2008 GMC Canyon Owner's Manual - Page 103

Automatic Transmission Operation {CAUTION: Plugging the cord into an ungrounded outlet could cause an electrical shock. Also, the wrong kind of extension cord could overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong 110-volt AC outlet. If the cord will not reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. 4. Before starting the engine, be sure to unplug and store the cord as it was before to keep it away from moving engine parts. If you do not, it could be damaged. How long should you keep the coolant heater plugged in? The answer depends on the outside temperature, the kind of oil you have, and some other things. Instead of trying to list everything here, we ask that you contact your dealer/retailer in the area where you will be parking your vehicle. The dealer/retailer can give you the best advice for that particular area. Your automatic transmission has a shift lever on the steering column. It features an electronic shift position indicator within the instrument cluster. This display must be powered anytime the shift lever is capable of being moved out of PARK (P). This means that if your key is turned off, but not in LOCK, there will be a small current drain on your battery which could discharge your battery over a period of time. If you need to leave your key in the ignition but not in LOCK for an extended period, it is recommended that you disconnect the battery cable from the battery to prevent discharging your battery. 2-23