See also:

Taillamps, Turn Signal, Sidemarker, Stoplamps, and Back-Up Lamps
A. Stop/Tail/Turn Signal/ Sidemarker Lamp B. Auxiliary Taillamp C. Back-up Lamp ...

When the Light Is On Steady
This indicates that one or more of the tires are significantly underinflated. A Driver Information Center (DIC) tire pressure message may also display. See Vehicle Messages on page 5‑42 for mor ...

Engine Air Cleaner/Filter
If the vehicle has a diesel engine, see “Pickup Models” under “Engine Air Cleaner/Filter” in the Duramax® Diesel Supplement for the correct inspection and replacement procedures. See Engine ...