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The 2018 GMC Sierra 1500 features a timing chain instead of a timing belt. While both serve the same purpose, the chain is positioned inside the engine as opposed to the belt which is situated outside. This internal placement protects the chain from wear and tear, allowing it to last the lifetime of the vehicle without needing frequent replacements like belts. Chains typically only require inspection due to their durability and minimal chances of malfunction.
In all engine choices for the GMC Sierra, a timing chain is used. The visible belt that runs the engine accessories is called a 'serpentine belt' or 'accessory belt'. It is important to note that these are distinct components that work separately. The timing chain or belt is typically hidden behind the timing cover on most vehicles and cannot be seen without removing it.
The GMC Sierra is equipped with a timing belt.