GMC Sierra problems
790 owners have filed defect reports on this one. That's not a small number. No active recalls — patterns come from the complaint record.
Average for the segment. Some recurring trouble spots worth knowing about.
The data says walk unless this exact vehicle has documented proof the brakes was repaired or replaced.
- 7 fire-related complaints and 1 crash-related complaint on the electrical system
- Brakes: 207 complaints, classified severe, failures cluster 43,000–75,000 mi
- Steering: 87 complaints, classified severe, failures cluster 35,000–76,000 mi
- Reliability score 6.8/10 — around the segment average
Our read of the federal NHTSA complaint and recall record for this exact year and model — not a substitute for a pre-purchase inspection. How we score.
Buying a used 2015 GMC Sierra? Check these first
Here's what this model is known to do — so you can inspect for it, price it in, or make the seller fix it before you sign.
What to inspect on this specific car
- brakes — 207 owner reports · tends to show around 61,461 mi · ~$450 to fix
- lighting — 112 owner reports · tends to show around 21,209 mi · ~$250 to fix
- powertrain — 98 owner reports · tends to show around 56,250 mi · ~$2,500 to fix
- steering — 87 owner reports · tends to show around 57,227 mi · ~$700 to fix
⚠ The one to take seriously: brakes is flagged severe on this model , showing up around 61,461 mi. Inspect it closely on a test drive.
Recalls to confirm are done
Run the VIN from the listing — no active recalls on this model right now, but confirm none were opened after this car was built.
Verdict for buyers: 6.8/10 model. The priciest documented failure is engine (~$3,100) — get the seller's service records for it or inspect closely. Otherwise an average-risk used buy at a fair price.
We tell you what this model is known for and what to inspect — a vehicle-history report tells you what this exact car has been through. Smart buyers get both.
See the full pre-purchase inspection checklist →Ask anything about your 2015 GMC Sierra
A noise, a warning light, a repair quote, "should I buy this?" — get an answer grounded in this vehicle's actual NHTSA record, not generic advice.
Answers use this vehicle's NHTSA complaint & recall record — owner-reported and unverified, not a diagnosis. Verify anything safety-critical with a mechanic.
Top trouble spots 8 categories with 3+ complaints
Your road ahead on this 2015 GMC Sierra
When owners report each system failing, in actual miles — so you can see what's likely behind you, what's due around now, and what to budget for next. Enter your mileage to mark where you are.
- ~11,761 misuspension~$900
- ~12,000 milighting~$250
- ~35,000 miairbags~$1,100
- ~36,000 mibody~$1,500
- ~42,000 mipowertrain~$2,500
- ~44,000 mivisibility~$350
- ~53,000 mielectrical~$850
- ~55,000 misteering~$700
- ~56,000 mibrakes~$450
- ~75,000 miengine~$3,100
"Typical" = median owner-reported failure mileage from the NHTSA complaint record for this exact year and model. Not a maintenance schedule — a heads-up on where this model's failures cluster.
What owners are saying recent NHTSA-filed complaints · verbatim
Steering Suddenly stops working when making a turn and have no control of the steering . Happen 3 times yesterday almost was in a accident. Then starts working again.
Rear sliding glass window defogger contacts are smoking and making sizzling noise. Fire hazard. Had to remove fuse number 10 from engine block to prevent auto start from engaging rear defogger in cold weather, or to prevent defogger switch from being engaged by family member.…
Used the remote start to warm the truck up. Got in and was leaving my driveway and the rear window exploded. Read defrost was on since we received 6+ inches on snow today.
4 months ago the display portrayed a message stating, trailer brake warning, have system checked. Since that time I have attempted on numerous to have my vehicle checked. But as of this date I have not been to have any dealership look at my vehicle. I have been told by…
Estimate your repair exposure
Drag to your current mileage. Numbers are derived from this vehicle's complaint history.
Common questions
Is the 2015 GMC Sierra reliable?
It's got known weak points. With a reliability score of 6.8 out of 10 based on 790 owner complaints filed with NHTSA, the 2015 GMC Sierra has a higher-than-average rate of reported issues. The areas to watch are listed above. Whether it's worth owning depends on price, condition, and how much repair exposure you can absorb.
Should you avoid the 2015 GMC Sierra?
On the NHTSA data, the 2015 GMC Sierra is one to avoid unless a specific vehicle proves otherwise. The data says walk unless this exact vehicle has documented proof the brakes was repaired or replaced. The record behind that call: 7 fire-related complaints and 1 crash-related complaint on the electrical system; Brakes: 207 complaints, classified severe, failures cluster 43,000–75,000 mi; Steering: 87 complaints, classified severe, failures cluster 35,000–76,000 mi; Reliability score 6.8/10 — around the segment average. This is our read of the federal complaint and recall data — not a substitute for a pre-purchase inspection.
What should I check before buying a used 2015 GMC Sierra?
Inspect the brakes first — it's the most-reported issue on this model, with 207 owner complaints filed. Typical failure occurs around 61,461 miles. Average repair cost runs about $450 at an independent shop. Also confirm any open recalls have been completed by running the VIN, and ask for service records covering the problem areas listed above.
Is the 2015 GMC Sierra a good used car to buy?
It scores 6.8 out of 10 on our NHTSA-based read of 790 owner complaints. The main thing to watch is brakes. Typical failure occurs around 61,461 miles. Priced fairly and clean on inspection, it's a reasonable used buy. Our data covers what this model is known for — pair it with a vehicle-history report on the VIN to see what that specific car has been through.
What's the most common problem on the 2015 GMC Sierra?
Based on NHTSA records, the most-reported issue is brakes, with 207 complaints filed. Typical failure occurs around 61,461 miles. Average repair cost runs about $450 at an independent shop.
What's the most expensive thing that goes wrong?
The brakes is one of the costlier repair items. Average repair cost runs about $450 at an independent shop. Typical failure occurs around 61,461 miles. Catching early warning signs can sometimes extend life by 20–30,000 miles.
How do I check if my GMC Sierra has open recalls?
Paste your VIN into the decoder at the top of this page. We pull live from NHTSA, so you'll see exactly which campaigns apply to your vehicle and whether the dealer has logged the fix. Recall repairs are always free regardless of mileage or warranty status.
Is an extended warranty worth it on a 2015 GMC Sierra?
Math is straightforward: a quality service contract runs $1,800–3,500 over 3 years. With 790 complaints on file and the costliest repair averaging $450, one major failure more than pays for it. The catch is reading the contract — many providers exclude wear items and require pre-authorization, so cheaper plans are not always better value.