Is GMC reliable?
48% of the 69 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 ~190k~106k
Trouble-free mileageacross all body styles69
GMCs inspectedreal pre-purchase inspections56/100
Average conditionall cars we check: 61/100Based on 69 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
Oil leaks · Engine
48%
Active error codes · Electronic equipment
45%
Fuel trim out of range · Engine
39%
Tires condition & wear · Brakes and tires
38%
Leaking or worn shock absorbers · Suspension
26%
Share of inspected GMCs where each item was flagged.
How they score
Excellent 20%
Good 28%
Mediocre 25%
Poor 28%
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%
29%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 ~106k miles. It ranks GMC #17 of 24 brands we have enough data to rate; the longest-lasting, Tesla, holds up to ~190k. 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
When you're standing in front of a used GMC, start with the engine. Oil leaks hit 48 percent of them and fuel trim is often out of range, so a dry engine plus a clean live scan is the real buy. Don't trust a blank dash—active codes are common and more of these have had codes cleared than usual, so demand a diagnostic before you negotiate. Price in tires and worn shocks after that. They tend to drop below decent around 106,000 miles, so stay under that or walk if leaks and codes are already there.
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 (45%), 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 69 inspections · updated Sep 11, 2026
