Is GMC reliable?
49% of the 66 GMCs we inspected scored 60/100 or higher, averaging 56/100 — they tend to be in noticeably worse shape than average.
#17 of 24
Longevity rank#1 Tesla holds up to ~185k~107k
Trouble-free mileageacross all body styles66
GMCs inspectedreal pre-purchase inspections56/100
Average conditionall cars we check: 61/100Based on 66 used GMCs we inspected, they tend to be in noticeably 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
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 20%
Good 29%
Mediocre 24%
Poor 27%
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 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 ~185k. 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
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
Engine and electronics issues dominate here—oil leaks and active error codes each hit nearly half the cars, with fuel-trim problems right behind. Condition tends to slide after about 107,000 miles, so target lower-mileage examples and insist on a full code scan plus a close look underneath for leaks and worn shocks. Those findings give you real leverage to negotiate hard or walk; ignoring them means inheriting deferred maintenance that already shows up often enough to matter.
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 12, 2026
