GMC Sierra Shuts Down While Driving (Common Causes)

If your GMC Sierra is shutting down while driving, it’s a real safety hazard.  Vehicles are a lot harder to control without power brakes or steering.   GMC Sierra Shuts Down When Driving: Top Causes Directly below is a list of the most common reasons why your Sierra would randomly die while driving.  It may … Read more

GMC Sierra:  Brake Lights Not Working Diagnosis

Brake lights are one of the most critical safety features that your GMC Sierra has.  They let other drivers know when you are slowing down, and that they need to slow down too.  If your brake lights aren’t working, you’re way more likely to get rear ended than normal.  The good news is that troubleshooting … Read more

GMC Sierra: What’s Causing That Rotten Egg Smell?

One of the most undervalued diagnostic tools is the human nose.  There’s a lot our nose can tell us about a vehicle with a few quick sniffs.  If you happen to smell a rotten egg smell coming from your GMC Sierra, it is certainly a cause for concern.  It is most commonly associated with a … Read more

GMC Sierra Dies After Starting Diagnosis

It can be very disconcerting if your GMC Sierra is starting and then dies.  It is most likely caused by some type of issue with the electrical or fuel system.  But, there can be other causes as well. Your Sierra’s engine needs 3 things constantly and in the proper proportion to keep running. Air Fuel … Read more

GMC Sierra: Brake Lights Stuck On → Diagnosis

It is both frustrating and unsafe to drive your GMC Sierra if the brake lights are stuck on.  The most common reason that they stay on is a brake light switch that has failed.   How Brake Lights Work Brake lights work by having an electric current sent to the brake pedal switch at all … Read more

GMC Sierra: Shaking When Accelerating → Diagnosis

One of the more common issues that can occur is a vehicle that shakes when accelerating.  If your GMC Sierra is shaking when accelerating, it’s something that should not be ignored.  While the vibration can be annoying, it is often indicative of a serious problem.   Speed Matters Vehicle speed matters when you feel a … Read more

GMC Sierra:  Lifter Ticking Diagnosis

One of the most annoying things that you can coming from under the hood of your GMC Sierra is a ticking lifter.  The ticking noise makes it sound like the engine is going to give up the ghost at any time.  There are a few things that can cause a lifter to tick, such as … Read more

GMC Sierra:  Clutch Slipping → Diagnosis

Your GMC Sierra’s clutch provides a direct connection between the engine and transmission.  Without it, it can’t move at all. This connection requires a tremendous amount of pressure.  This guide is intended to help you determine why your clutch is slipping on the flywheel. Note:  This article is for manual cars only.  Here’s the automatic … Read more