If you get into your 2002 GMC Envoy expecting to go somewhere but the vehicle won't start, it could be the result of several different problems. You most likely have a faulty component in your ignition system. Clicking sounds, without engine firing is a sign that the battery, ignition switch, starter motor or starter solenoid has become defective. Diagnosing which part became defective requires troubleshooting.
Things You'll Need
- Socket set
- Baking Soda
Place the negative lead of your voltmeter onto the negative terminal of your battery and then place the positive lead of your voltmeter onto the positive terminal. If the voltmeter reads 12 volts, the battery is fine. If not, charge the battery and test it again. After charging the battery and determining it works, attempt to start the vehicle. If it will not start, move to the next step.
Remove the battery connectors from the battery with a socket and ratchet. Clean the connectors with a 50/50 solution of water and baking soda to remove corrosion and battery acid that could prevent a good connection with the electrical system. Reattach the connectors. If the Envoy will not start, move on to the next step.
Turn on the headlights and attempt to start the Envoy. If the lights dim, the ignition switch works because it is sending current from the battery to the starter solenoid. If it does not work, the ignition relay is likely defective. If it does dim the lights, move to the next step.
Locate the starter motor. It bolts to the transmission housing on the lower half of the engine. The starter solenoid bolts to the top of the starter motor. On the back of the solenoid, you will find two large metal contacts with wires connected to them. Create a bridge between the two contacts with the blade of your screwdriver. This shorts out the solenoid and creates a direct connection between the starter and the ignition. Have a second person attempt to start the GMC. The starter motor should turn on and start to hum. If it does not turn on or it runs rough, the starter motor is defective. If it runs smooth, the solenoid is defective.
- Type2: Troubleshooting Ignition System
- "Chevrolet TrailBlazer, GMC Envoy Repair Manual 2WD & 4WD 2002-2009"; Alan Ahlstrand, Ralph Rendina, John H. Haynes; 2009
- Photo Credit Scott Halleran/Getty Images News/Getty Images
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