**Ticking noises in a 2014 GMC Sierra are most commonly caused by lifter issues. The lifter is a part that sits between the cylinder valves and a car’s camshaft that allows the valve to open. When the lifter begins to fail, it can often make a ticking noise that’s consistent as long as the engine is in motion—driving, idling, or otherwise.
If fixing that doesn’t solve the issue, some other components to check are:
Unfortunately, fixing a lifter issue isn’t exactly cheap. It runs from about $1,000 to $2,500. This isn’t really due to the price of the part; reaching the lifters in most vehicles is just insanely time-consuming, which causes you to rack up a ton of labor charges.