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What does the warning light symbol wrench and gear mean on a 2004 gmc c5500 duramax diesel 6.6 top kick?

The warning light symbol wrench and gear on a 2004 GMC C5500 Duramax diesel 6.6 Top Kick indicates a problem with the vehicle's emission control system. This could be due to a variety of factors, such as a faulty oxygen sensor, catalytic converter, or EGR valve. It is important to have the vehicle diagnosed by a qualified mechanic as soon as possible to prevent further damage to the engine or emission control system.