The Worst 2014-2019 Sierra 3500 Problems

  1. The Sierra Has Terrible Headlights

    For such a big, rugged truck, the GMC Sierra has some of the worst headlights on the road. But why?…

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  2. What Are We Missing?

    We know there's more problems than this. Let us know which one you'd like to see us cover next.

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What Owners Complain About

Sometimes it helps just to tally up the complaints and see where the biggest stacks are. Use this information to learn about troublespots or to run for the hills.

3rd Generation Sierra 3500 Key Numbers

  1. 3 model years

    Grouping all models by their year can reveal some baddies.

  2. 8 complaints

    Running tally of owner grievances filed to CarComplaints.com.

  3. 4th in reliability

    Overall reliability rank out of 32 eligible generations.

Recent 3rd Generation Sierra 3500 News

There's a lot of news out there, but not all of it matters. We try to boil down it to the most important bits about things that actually help you with your car problem. Interested in getting these stories in an email? Signup for free email alerts over at CarComplaints.com.

  1. The front gas tank in some 2016-2018 General Motors HD trucks is overfilling, rupturing, and leaking fuel.

    The affected trucks all have two gas tanks. …

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  2. GM allegedly cut corners by installing a fuel pump that isn’t compatible with US diesel in its larger trucks.

    It’d almost be hard to believe, except we are talking about GM here.…

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  3. A lawsuit says a failed vacuum pump in GM’s brake boosters can make the brake pedal extremely hard to push

    , leading to longer stopping distances and accidents.

    While investigating a rear-end collision involving the lead plaintiff ”GM told her she should read the manual to understand how the brakes worked.” Nothing says “we value our customers” like accusing them of not knowing how brakes work. GM promised to fix the plaintiff’s bumper in exchange for confidentiality. Obviously this didn’t go over well.

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  4. A lawsuit regarding the GMC Sierra’s “inadequate” headlights is still burning bright in a California court.

    The plaintiffs allege GM made changes in the bulbs, assemblies and operation of the headlights … GM allegedly changed to projector-style headlights with single bulbs, smaller reflectors, two lenses each and shutters to switch between high and low beams that work from a single voltage source.

    The lawsuit was filed back in 2015 after owners started questioning GM’s headlight redesign for the 2014 and 2015 model years.

    Look – if you saw one of these trucks driving in the oncoming lane at night, I wouldn’t blame you if you confused it for a pair of mopeds with weak batteries. It’s that bad.

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  5. It’s bad enough to have your truck recalled because the brake pedal might fall off.

    It gets worse when you find out there’s a good chance your truck wasn’t properly fixed … and the brake pedal still might fall off. When a 2015 Silverado that had previously been “repaired” as part of the recall was brought back in for service, it raised a big ole’ red flag.

    The automaker then learned the truck had been repaired under a February 2016 recall, something that caused the automaker to open a formal investigation. The GM investigator determined the truck had only been inspected and did not receive adhesive on the brake pivot pedal nut even though the recall procedures required it.

    GM is re-recalling 41,000 trucks to fix the problem. Maybe they’ll read the instructions this time.

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