Used GMC Sierra: Common Problems to Watch Before You Buy

The Sierra shares its bones with the Silverado but often comes with more features and a higher price tag. The same mechanical issues apply, plus a few Sierra-specific concerns. Here's what to check.

The Most Common Sierra Issues (and What to Check)

1) AFM/DFM Lifter Issues (V8 Models)

Just like the Silverado, Sierra V8s with Active Fuel Management or Dynamic Fuel Management can develop lifter problems. This is the big one.

2) Transmission Shudder

The 8-speed and 10-speed automatics can develop shudder, especially at light throttle and highway speeds.

3) MultiPro Tailgate Issues (If Equipped)

The Sierra's signature MultiPro tailgate is innovative but has more moving parts that can fail. Check all positions and functions.

4) Steering and Front Suspension Wear

Heavy wheels, towing, and rough roads accelerate wear on steering and suspension components.

5) Infotainment and Electrical

Denali and AT4 trims come loaded with tech that can develop glitches. Check everything.

6) Rust and Underbody Condition

Same as Silverado, check for rust, especially if it's from salt states or has been used on job sites.

Quick Sierra Checklist

• Cold start listen: tick type and intensity
• Highway cruise: feel for transmission shudder
• MultiPro tailgate: test all positions if equipped
• All electronics: screens, cameras, comfort features
• 4WD operation: engagement and transfer case noises
• Undercarriage: rust inspection with flashlight

When to Walk Away

A Sierra offers everything the Silverado does with some extra refinement and features, but you pay more for it. Make sure the truck you're looking at justifies the premium. The same mechanical issues apply, so don't skip inspection just because it has nicer leather and a fancier badge.