Is GMC reliable?
50% of the 66 GMCs we inspected scored 60/100 or higher, averaging 58/100 — they tend to be in slightly worse shape than average.
#9 of 24
Longevity rank#1 Tesla holds up to ~177k~121k
Trouble-free mileageacross all body styles66
GMCs inspectedreal pre-purchase inspections58/100
Average conditionall cars we check: 61/100Based on 66 used GMCs we inspected, they tend to be in slightly worse shape than average — average condition 58/100 vs 61 for all cars we check. Every number on this page comes from real pre-purchase inspections — cars people were about to buy and paid an independent inspector to go through point by point, engine to underbody, paint depth to error codes. Not owner surveys, not warranty statistics, not forum lore: what we actually found.
What we found
Most common faults
Active error codes · Electronic equipment
47%
Oil leaks · Engine
47%
Fuel trim out of range · Engine
38%
Tires condition & wear · Brakes and tires
36%
Leaking or worn shock absorbers · Suspension
26%
Share of inspected GMCs where each item was flagged.
How they score
Excellent 18%
Good 32%
Mediocre 32%
Poor 18%
Hidden history
What the seller might not mention — how often we find it on GMCs.
76%had a repainted or replaced panelall cars: 75%
5%showed structural repairall cars: 4%
27%had fault codes recently clearedall cars: 23%
Compare with another brand:
Cross-shopping? GMC vs Toyota · GMC vs Ford · GMC vs Honda
How long does a GMC last?
Across every GMC body style we've inspected — sedans, SUVs and anything else pooled together — the average one's condition dips below decent (a 55/100 score) around ~121k miles. It ranks GMC #9 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~177k. Shopping a GMC near that mileage? Expect more wear ahead — see which makes give the best odds at your budget.
Good cars by mileage
Good cars by age
Share of GMCs in good shape (scoring 60+/100) by mileage and by age when we inspected them (each dot ≥5 cars; rolled-back odometers excluded from the mileage curve). The dashed grey curve is all cars we check.
GMC models we've inspected
Sierra
29 cars · 52% good
Yukon
22 cars · profile soon
Recently inspected:
2023 GMC Sierra 1500 · 36k mi — flagged: engine control module, tires condition & wear. Inspected Jul 22.
2023 GMC Sierra 1500 · 36k mi — flagged: crankcase gas pressure, battery condition, engine control module. Inspected Jul 17.
The bottom line
GMC holds up longer than most brands, staying decent out to about 121,000 miles, yet the cars in front of you frequently hide engine oil leaks and active error codes that demand first attention. Scan for those two issues and any fuel-trim problems right away—they justify a steep discount or walking if the seller downplays them. Check tire wear and shocks next, then confirm no recent code wipes. Repaints are common but structural work is rare, so body cosmetics matter less than proving the powertrain is dry and talking clean.
FAQ
?
?
What are the most common problems with a used GMC?
Across the GMCs we inspected, the items we flag most often are active error codes (47%), oil leaks (47%), fuel trim out of range (38%).
Thinking of buying a GMC? Get the exact car inspected before you pay.
Book an inspection
Based on 66 inspections · updated Aug 1, 2026
