Is GMC reliable?
48% of the 70 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 ~186k~107k
Trouble-free mileageacross all body styles70
GMCs inspectedreal pre-purchase inspections56/100
Average conditionall cars we check: 61/100Based on 70 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
49%
Active error codes · Electronic equipment
44%
Tires condition & wear · Brakes and tires
39%
Fuel trim out of range · Engine
39%
Leaking or worn shock absorbers · Suspension
26%
Share of inspected GMCs where each item was flagged.
How they score
Excellent 21%
Good 27%
Mediocre 24%
Poor 27%
Hidden history
What the seller might not mention — how often we find it on GMCs.
74%had a repainted or replaced panelall cars: 74%
4%showed structural repairall cars: 4%
29%had fault codes recently clearedall cars: 24%
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 ~107k miles. It ranks GMC #17 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~186k. 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; a band under 20 cars follows the nearby bands, so a run above the all-cars line stays above it, and a band of 20 or more uses the rate we measured; where a band has too few cars, the line follows the trend between the bands on either side; 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
24 cars · profile soon
Recently inspected:
2023 GMC Yukon XL · 102k mi — flagged: oil leaks, tires condition & wear, instrument panel cluster control module. Inspected Sep 29.
2019 GMC Terrain · 49k mi — flagged: oil leaks, fault codes recently cleared, fuel trim out of range. Inspected Aug 27.
The bottom line
GMC buyers should worry about the engine bay before the paint. Repaints match the wider market and structural repairs are uncommon, so cosmetics alone should not kill a deal. Oil leaks and fuel-trim trouble show up often enough that a clean dashboard is not reassurance—codes get cleared more than usual here. Scan it cold, then check for seepage, worn tires, and leaking shocks; those justify a lower price. Condition tends to slip below decent around 107,000 miles, and longevity ranks toward the back of the field, so favor a lower-mileage example with a clean scan and walk if engine faults stack on wiped codes.
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 (49%), active error codes (44%), tires condition & wear (39%).
Thinking of buying a GMC? Get the exact car inspected before you pay.
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Based on 70 inspections · updated Oct 21, 2026
