Is GMC reliable?
49% of the 67 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 ~189k~109k
Trouble-free mileageacross all body styles67
GMCs inspectedreal pre-purchase inspections56/100
Average conditionall cars we check: 61/100Based on 67 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
Active error codes · Electronic equipment
46%
Oil leaks · Engine
46%
Tires condition & wear · Brakes and tires
37%
Fuel trim out of range · Engine
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 24%
Poor 27%
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%
27%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 ~109k miles. It ranks GMC #17 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~189k. 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:
2023 GMC Yukon · 55k mi — flagged: low coolant / cooling system issues, tires condition & wear. Inspected Aug 17.
2023 GMC Sierra 1500 · 36k mi — flagged: engine control module, tires condition & wear. Inspected Jul 22.
The bottom line
A used GMC demands you start with a full scan for active error codes and a close look at the engine for oil leaks, because those two issues dominate what we see going wrong. Fuel mixture problems and tired tires or shocks often come along for the ride, so budget for those or use them to talk the price down. Longevity isn't a strong suit here, with condition typically sliding after 109,000 miles, which means lower-mileage examples are the safer bet and anything well past that should make you hesitate or demand a serious discount. Watch for recently cleared codes as a red flag that something was being hidden.
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 active error codes (46%), oil leaks (46%), tires condition & wear (37%).
Thinking of buying a GMC? Get the exact car inspected before you pay.
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Based on 67 inspections · updated Aug 22, 2026
