Is the GMC Sierra reliable?
50% of the 30 we inspected scored 60/100 or higher, with an average of 59/100 — it scores a little below average.
30
Cars inspectedreal pre-purchase inspections59/100
Average conditionall cars we check: 61/10050%
In good shape (60+)all cars we check: 56%Across 30 used GMC Sierras we inspected, this model scores a little below average — average condition 59/100 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
43%
Tires condition & wear · Brakes and tires
37%
Oil leaks · Engine
33%
Fuel trim out of range · Engine
27%
Leaking or worn shock absorbers · Suspension
23%
Share of inspected GMC Sierras where each item was flagged.
How they score
Excellent 30%
Good 20%
Mediocre 27%
Poor 23%
Hidden history
What the seller might not mention — how often we find it on this model.
63%had a repainted or replaced panelall cars: 74%
3%showed structural repairall cars: 4%
37%had fault codes recently clearedall cars: 24%
More on GMC
Other GMC models we've inspected — or see the full GMC profile.
Straight from recent GMC Sierra reports
2024 GMC Sierra · 43k mi — flagged: worn brake rotors, excessive pads wear, driver seat adjuster memory module. Inspected Nov 3.
2023 GMC Sierra · 36k mi — flagged: engine control module, tires condition & wear. Inspected Jul 22.
The bottom line
The Sierra in front of you is less a body-shop gamble than an electronics and engine one. Structural repairs barely show up, and repaint history runs better than the wider fleet, so a clean frame is the baseline, not a bonus. What should stop you is a dash that looks quiet: cleared codes are unusually common, and active error codes still turn up on 43% of these trucks. Read the computer before you talk price, then get under the engine for oil leaks and out-of-range fuel trim. Tires and shocks are negotiation chips, not walk-away items, unless the scan or the leaks get dismissed.
FAQ
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What are the most common problems on a used GMC Sierra?
The items we flag most often are active error codes (43%), tires condition & wear (37%), oil leaks (33%). Have these checked before buying.
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Should I worry about cleared fault codes?
On 37% of these cars the ECU codes had been erased shortly before sale, which can hide active faults. Ask for a diagnostic scan and start the engine from cold.
Thinking of buying a GMC Sierra? Get the exact car inspected before you pay.
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Based on 30 inspections · updated Nov 11, 2026
