See also:

Tow/Haul Mode Light
This light comes on when the Tow/Haul mode has been activated. For more information, see Tow/Haul Mode on page 9‑26. ...

Emissions Inspection and Maintenance Programs
Some local governments may have programs to inspect the on-vehicle emission control equipment. For the inspection, the emission system test equipment is connected to the vehicle’s Data Link Conn ...

Vehicle Overview
The GMC Sierra 1500 and Chevrolet Silverado share the same platform, but the GMC product is often positioned as a more upscale offering. Mechanically, the trucks are the same. There might be sligh ...