Is GMC reliable?
48% of the 64 GMCs we inspected scored 60/100 or higher, averaging 57/100 — they tend to be in slightly worse shape than average.
#10 of 24
Longevity rank#1 Tesla holds up to ~176k~119k
Trouble-free mileageacross all body styles64
GMCs inspectedreal pre-purchase inspections57/100
Average conditionall cars we check: 60/100Based on 64 used GMCs we inspected, they tend to be in slightly worse shape than average — average condition 57/100 vs 60 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
Oil leaks · Engine
48%
Active error codes · Electronic equipment
47%
Fuel trim out of range · Engine
39%
Tires condition & wear · Brakes and tires
36%
Leaking or worn shock absorbers · Suspension
27%
Share of inspected GMCs where each item was flagged.
How they score
Excellent 17%
Good 31%
Mediocre 33%
Poor 19%
Hidden history
What the seller might not mention — how often we find it on GMCs.
78%had a repainted or replaced panelall cars: 76%
5%showed structural repairall cars: 4%
28%had fault codes recently clearedall cars: 23%
Compare with another brand:
Cross-shopping? GMC vs Toyota · GMC vs Honda · GMC vs Ford
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 ~119k miles. It ranks GMC #10 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~176k. 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
27 cars · 48% good
Yukon
22 cars · profile soon
Recently inspected:
2014 GMC Sierra · 113k mi — flagged: oil leaks, fuel trim out of range, dirty or low transmission fluid. Inspected Jun 21.
2016 GMC Sierra 1500 · 166k mi — flagged: signs of recent repair, seat belts, leaking or worn shock absorbers. Inspected May 26.
The bottom line
Engine issues dominate the picture on used GMCs, so begin every look with a careful check for oil leaks and fuel-trim problems while scanning for the active error codes that plague so many. The 78 percent repaint rate means you should also verify panel thickness and history carefully before trusting the exterior. These hold up reasonably until about 119,000 miles, making lower-odometer examples the smarter buy; use any shock or tire wear to negotiate, and walk if leaks or codes are already present.
FAQ
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What are the most common problems with a used GMC?
Across the GMCs we inspected, the items we flag most often are oil leaks (48%), active error codes (47%), fuel trim out of range (39%).
Thinking of buying a GMC? Get the exact car inspected before you pay.
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Based on 64 inspections · updated Jul 12, 2026
