GMC trucks include multiple warning lights that can be used to troubleshoot problems within the vehicle. In addition, symptoms that occur along with such problems can also be used to identify certain issues while eliminating others. Problems with a GMC truck can be related to the engine, electrical system or any other component of the truck's operational systems. These kinds of issues can be identified and corrected by following some simple troubleshooting steps.
Monitor warning lights. Warning lights that light up in the instrument cluster relay messages that identify problems. In addition to the usual lights, like "Check Engine," newer lights, like a low tire pressure warning light, can be displayed on later GMC truck models. Some lights, like the airbag readiness light, will come on briefly when starting and then go out. If the light stays on and is accompanied by a chime, you should contact a dealer for corrective action.
Be aware of physical symptoms. If the vehicle doesn't behave as normally expected, such issues may be symptomatic of larger problems. Poor handling can be indicative of low tire pressure, so it would be wise to check the air levels in the tires. Unexpected engine stopping could mean that the gas tank is empty; fill it. Noisy brakes may mean the brake pads need to be checked for wear.
Check the fuse boxes. If electrical parts stop working, like the memory seat, for example, a blown fuse may be the issue. If, when you press your seat memory button it doesn't work, replace the fuse. The seat fuse is in the interior cabin fuse box and is located under the left side of the steering wheel. There is also an additional fuse box in the engine compartment that holds high-current fuses, like the fuel pump. Consult the index on the lid of the fuse box and replace the fuse--with the included fuse puller--for corresponding problem part. Use like fuses.
