"How reliable is the 2011 Gmc Sierra Denali?"

"Based on 40 NHTSA complaints, the 2011 Gmc Sierra Denali has a median complaint mileage of 62500 miles. The most common issue is Unknown Or Other."

"What are common problems with the 2011 Gmc Sierra Denali?"

"The most frequently reported component in NHTSA complaints for the 2011 Gmc Sierra Denali is Unknown Or Other, accounting for a significant portion of the 40 total complaints filed."

2011 Gmc Sierra Denali: Reliability Data

Source: NHTSA — 40 complaints

Total Complaints

62,500mi

Median Mileage

Unknown Or Other

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

51,000 25th Percentile

62,500 Median Mileage

90,250 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

Unknown Or Other

Air Bags

Body

Power Train

Wheels

Structure

Suspension

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"ON JULY 29, 2015, WHILE DRIVING AT APPROXIMATELY 45 MPH, THE VEHICLE SUDDENLY DOWNSHIFTED ITSELF INTO FIRST GEAR CAUSING THE VEHICLE TO SLOW DOWN SUDDENLY WITH NO NOTICE. I WAS ABLE TO GET THE VEHICLE OFF THE ROAD AND INTO A GAS STATION. AFTER THE FACT THE CHECK ENGINE LIGHT WAS ILLUMINATED. THE ..."

"DASHBOARD CRACK ABOVE STEERING COLUMN AND ABOVE PASSENGER SIDE AIRBAG. THIS ISSUE POSES SAFETY CONCERNS REGARDING WHETHER THE AIRBAG WILL BE PUNCTURED OR OTHERWISE INEFFECTIVE DURING DEPLOYMENT DUE TO THE SHARP CRACKED EDGES OF THE DASH AS WELL AS THE POTENTIAL FOR SHARDS OF CRACKED DASH BECOMING PR..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

When Were Complaints Filed?

Number of complaints by the year the issue occurred.

When Does Each Component Fail?

Median mileage at complaint for top components.

Unknown Or Other 17 complaints

25th: 60,000 mi Median: 68,000 mi 75th: 92,500 mi

Air Bags 10 complaints

25th: 52,062 mi Median: 57,625 mi 75th: 87,750 mi

Body 8 complaints

25th: 39,000 mi Median: 63,000 mi 75th: 78,750 mi

Where Are Complaints Coming From?

Top states by complaint count.

TX: 5 LA: 4 CO: 3 FL: 3 PA: 3 WA: 3 NC: 2 VA: 2 OH: 2 KS: 2

Gmc Sierra Denali — Other Years

See how this model compares across different model years.

Year	Complaints	Median Mileage	Top Issue	Crashes
2008	21	68,000	Body	0
2015	24	47,800	Service Brakes	1
2016	42	54,000	Power Train	2
2018	25	20,350	Engine	0
2019	46	5,269	Service Brakes	0

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28