2018 GMC Sierra 3500: Problems & Reliability
TOO FEW REPORTS2018 GMC Sierra 3500: TOO FEW REPORTS — 14 owner complaints; top issue: service brakes (6 complaints).
The verdict engine has only 14 complaints for the 2018 — under the 15-complaint floor — so it is not rated yet rather than called clean by silence.
Sources: NHTSA owner complaints (ODI), recall campaigns and manufacturer service bulletins, CarWhere verified buyer prices · Model years 2015–2026 compared · Updated 2026-11-07 · By CarWhere Research · Methodology
14
NHTSA complaints
12
Model years compared
749
Service bulletins
6
Recall campaigns
Most-reported 2018 GMC Sierra 3500 problems
Service brakes is the clear leader, named in 43% of complaints.
| Component | Complaints | Share of 2018 complaints |
|---|---|---|
| Service brakes | 6 | 43% |
| Steering | 3 | 21% |
| Electrical system | 2 | 14% |
| Exterior lighting | 2 | 14% |
| Fuel system | 1 | 7% |
A complaint can name more than one component, so shares can add up to more than 100%.
2018 GMC Sierra 3500 recalls
6 recall campaigns on federal record for the 2018, reported between Sep 14, 2017 and Oct 10, 2024.
| NHTSA campaign | Reported | Component |
|---|---|---|
| 24V756000 | Oct 10, 2024 | Air bags › Side/window › Curtain › Inflator |
| 23V047000 | Feb 2, 2023 | Fuel system, diesel › Storage › Tank assembly |
| 21V496000 | Jul 1, 2021 | Equipment › Electrical › Engine block heater |
| 19V328000 | Apr 25, 2019 | Engine |
| 19V088000 | Feb 7, 2019 | Fuel system, gasoline › Storage › Tank assembly |
| 17V567000 | Sep 14, 2017 | Seat belts › Front › Retractor |
2018 GMC Sierra 3500 service bulletins
The manufacturer has filed 749 technical service bulletins with NHTSA for the 2018 — close to the 735 of the median Sierra 3500 year from 2015 to 2026. Coded bulletins most often cover electrical system (157), engine & cooling (142), powertrain / transmission (78). Bulletins are repair instructions for dealer technicians, not recalls.
The 2018 vs. the year before and after
From the 2017 to the 2018, owner complaints fell by more than half (74 → 14) — an improvement. The 2019 that followed held roughly level (14 → 13).
| Model year | Verdict | Complaints | Bulletins | Recalls | Avg. buyer-paid |
|---|---|---|---|---|---|
| 2017 Sierra 3500 | AVOID | 74 | 628 | 7 | — |
| 2018 (this page) | TOO FEW REPORTS | 14 | 749 | 6 | — |
| 2019 Sierra 3500 | TOO FEW REPORTS | 13 | 655 | 7 | — |
Prices are averages of CarWhere verified buyer transactions (shown when 3+ deals exist for the year). Full year-by-year table: GMC Sierra 3500 years to avoid.
What to check on a used 2018 GMC Sierra 3500
Service brakes (6 complaints on the 2018): check pedal feel, pulling and grinding, look at rotor and pad wear, and ask when the brake fluid was last changed.
Steering (3 complaints on the 2018): check for a steering warning light, heavy or notchy steering at parking speed, and clunks over bumps.
Electrical system (2 complaints on the 2018): test every light, window, lock, the infotainment screen and the charging system, and have the car scanned for stored fault codes.
Exterior lighting (2 complaints on the 2018): check low and high beams, brake lights and turn signals, and look for condensation inside the housings.
Fuel system (1 complaint on the 2018): smell for fuel around the car, watch for hesitation or stalling, and check for a lit check-engine light.
Recalls: confirm all 6 campaigns above were completed on this VIN.
Know what to pay for the right 2018 GMC Sierra 3500 — then negotiate it
Years-to-avoid tells you which year. Search live listings to see the target price and what verified buyers actually paid for it.
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FAQ
Is the 2018 GMC Sierra 3500 reliable?
2018 GMC Sierra 3500: TOO FEW REPORTS — 14 owner complaints; top issue: service brakes (6 complaints). The verdict engine has only 14 complaints for the 2018 — under the 15-complaint floor — so it is not rated yet rather than called clean by silence.
What are the most common 2018 GMC Sierra 3500 problems?
By NHTSA owner complaints, the most-reported areas on the 2018 GMC Sierra 3500 are service brakes (6, 43%), steering (3, 21%), electrical system (2, 14%). The manufacturer has 749 service bulletins on file for this model year.
How many recalls does the 2018 GMC Sierra 3500 have?
6 recall campaigns on federal record for the 2018 GMC Sierra 3500, most recently 24V756000 (Oct 10, 2024, air bags); 23V047000 (Feb 2, 2023, fuel system, diesel); 21V496000 (Jul 1, 2021, equipment). Recall completion is VIN-specific, so check the exact car.
How do I check a specific 2018 GMC Sierra 3500 before buying?
Decode the VIN free at carwhere.com/tools/vin-decoder to confirm the build, then run the $9.99 CarWhere Full VIN Report for the exact VIN — recall, complaint, and service-bulletin record for this model year, the original window sticker where the manufacturer publishes one, and a market price check from verified buyers. One-time purchase, no subscription.
Sources & method
Complaint, recall and service-bulletin counts for the 2018 GMC Sierra 3500 come from NHTSA's Office of Defects Investigation; the verdict is CarWhere’s severity-weighted, time-on-road-adjusted score compared with the model’s own median year. Complaints are owner allegations, not verified defects. Full methodology.