Is the GMC Sierra reliable?
48% of the 27 we inspected scored 60/100 or higher, with an average of 59/100 — it scores about average.
27
Cars inspectedreal pre-purchase inspections59/100
Average conditionall cars we check: 60/10048%
In good shape (60+)all cars we check: 52%Across 27 used GMC Sierras we inspected, this model scores about average — average condition 59/100 vs 60 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
44%
Oil leaks · Engine
37%
Tires condition & wear · Brakes and tires
37%
Fuel trim out of range · Engine
30%
Leaking or worn shock absorbers · Suspension
26%
Share of inspected GMC Sierras where each item was flagged.
How they score
Excellent 22%
Good 26%
Mediocre 33%
Poor 19%
Hidden history
What the seller might not mention — how often we find it on this model.
70%had a repainted or replaced panelall cars: 76%
4%showed structural repairall cars: 4%
41%had fault codes recently clearedall cars: 23%
More on GMC
Straight from recent GMC Sierra reports
2014 GMC Sierra · 113k mi — flagged: oil leaks, fuel trim out of range, dirty or low transmission fluid. Inspected Jun 21.
2016 GMC Sierra · 166k mi — flagged: signs of recent repair, seat belts, leaking or worn shock absorbers. Inspected May 26.
FAQ
?
?
What are the most common problems on a used GMC Sierra?
The items we flag most often are active error codes (44%), oil leaks (37%), tires condition & wear (37%). Have these checked before buying.
?
Should I worry about cleared fault codes?
On 41% 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.
Book an inspection
Based on 27 inspections · updated Jul 12, 2026
