Some units of the GMC Sierra 1500, Yukon, and Yukon XL trucks and SUVs need an ECM software update to fix a glitch with the ...

Some units of the Chevy Silverado 1500, Tahoe, and Suburban trucks and SUVs need an ECM software update to fix a glitch with the check engine light.

A check-engine light could be a gentle reminder or a sign of something catastrophic. We explain what a malfunction indicator light is and what you can do about it.

The Engine Control Module (ECM) is the computer responsible for controlling the engine. The ECM communicates with other vehicle control units via a communication bus.