Is GMC reliable?
49% of the 68 GMCs we inspected scored 60/100 or higher, averaging 56/100 — they tend to be in slightly worse shape than average.
#17 of 24
Longevity rank#1 Tesla holds up to ~187k~108k
Trouble-free mileageacross all body styles68
GMCs inspectedreal pre-purchase inspections56/100
Average conditionall cars we check: 61/100Based on 68 used GMCs we inspected, they tend to be in slightly worse shape than average — average condition 56/100 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
Oil leaks · Engine
47%
Active error codes · Electronic equipment
46%
Fuel trim out of range · Engine
38%
Tires condition & wear · Brakes and tires
37%
Leaking or worn shock absorbers · Suspension
25%
Share of inspected GMCs where each item was flagged.
How they score
Excellent 21%
Good 28%
Mediocre 25%
Poor 26%
Hidden history
What the seller might not mention — how often we find it on GMCs.
75%had a repainted or replaced panelall cars: 75%
4%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 ~108k miles. It ranks GMC #17 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~187k. 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 · 49% good
Yukon
23 cars · profile soon
Recently inspected:
2019 GMC Terrain · 49k mi — flagged: oil leaks, fault codes recently cleared, fuel trim out of range. Inspected Aug 27.
2019 GMC Acadia · 82k mi — flagged: oil leaks, battery condition, fault codes recently cleared. Inspected Aug 26.
The bottom line
On a GMC, start under the hood and on a scanner before you talk money. Oil leaks hit 47 percent of these cars and fuel-trim issues ride along, so a wet engine or a messy scan is your walk-away signal, not a bargaining opener. A blank dash deserves extra suspicion because codes get wiped a bit more often than you'd like. Condition typically slips below decent around 108,000 miles, which is the smart cutoff unless everything underneath is dry. Worn tires and tired shocks are common enough to knock the price, not to surprise you.
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 (47%), active error codes (46%), fuel trim out of range (38%).
Thinking of buying a GMC? Get the exact car inspected before you pay.
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Based on 68 inspections · updated Aug 27, 2026
