Is the 2011 Gmc SIERRA DENALI reliable?

The 2011 Gmc SIERRA DENALI has 40 complaints filed with NHTSA (2.1x the segment average). Our reliability verdict: below-average. Most common issue: OTHER problems.

What are common problems with the 2011 Gmc SIERRA DENALI?

Top problems: OTHER (17 complaints, avg repair $500); AIR BAGS (10 complaints, avg repair $500); BODY/STRUCTURE (9 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2011 Gmc SIERRA DENALI?

No recalls have been issued for the 2011 Gmc SIERRA DENALI.

How much does it cost to insure a 2011 Gmc SIERRA DENALI?

Estimated US average full-coverage insurance for the 2011 Gmc SIERRA DENALI is approximately $1,366/year (sedan-midsize class). Actual quotes vary heavily by state, driver age, driving record, and credit — see the interactive insurance estimator on this page for state-specific pricing.

2011 Gmc SIERRA DENALI

Problems, Recalls & Reliability Report

Below Average

Quick Summary

The 2011 Gmc SIERRA DENALI has 40 owner complaints filed with NHTSA — that's 2.1x the segment average of 19. The most common issue is other problems (43% of all complaints), specifically: 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 .

Total Complaints

Recalls Issued

—/5

Safety Stars

2.1x

vs Segment Avg

Known Problems(top 5 of 6)

OTHER

17 complaints

43%

• 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
• MY DASH CRACKED IN 4 PLACES FROM THE PASSENGER AIRBAG, SPEAKER, ALONG WINDOW LINE ATTACHMENT AND UP THE DRIVERS SIDE INSTRUMENT PANEL. I WAS JUST TURNING A CORNER FROM ONE STREET TO THE NEXT AND I HEARD A LOUD SOUND. I THOUGHT SOMETHING HIT MY WINDOW BUT IT WAS MY DASH ITS SELF AND THE MORE I DROVE
• CRACKED DASHBOARD STARTED AT LEFT CORNER OF PASSENGER SIDE AIRBAG THEN CRACKED ABOVE INSTRUMENT PANEL AFRAID OF FLYING DEBRIS AND PUNCTURE OF AIRBAG. CONSTANTLY HEAR POPPING IN THE DASH MY P/U HAD APPROX 57000 MI AT TIME OF INCIDENT

Typical onset: 50K miles Est. repair: $500

“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 ”

— NHTSA complaint filing

When Problems Appear on the 2011 Gmc SIERRA DENALI

Based on 28 owner complaints that included an odometer reading. Median mileage at time of complaint: 63K miles. Most complaints cluster in the 60-100K miles range.

Overall complaint distribution by mileage

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

AIR BAGS

Reported earliermedian 58K mi · 6 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

OTHER

In line with typicalmedian 68K mi · 11 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

BODY/STRUCTURE

In line with typicalmedian 75K mi · 7 reports

0-30K

30-60K

60-100K

100-150K

150-200K

200K+

Mileage figures are self-reported by owners in NHTSA complaint filings. Peak bucket = the mileage range with the most complaints for that component; it reflects when owners noticed and reported problems, not necessarily when the fault first occurred.

Estimated Insurance Cost for 2011 Gmc SIERRA DENALI

Estimate only, not a quote. Modeled from NAIC + HLDI averages for a hypothetical 35-year-old driver with clean record + full coverage. Your actual quote depends heavily on your age, driving history, credit, ZIP code, and insurer.

Your state (affects local premium average)

Full coverage / year

$1,366

Full coverage / month

$114

Liability only / year

$611

vs US avg

-18%

How this estimate is calculated

US base full-coverage premium$1674

× state (US)1.00x

× vehicle class (sedan-midsize)0.96x

× theft risk1.00x

× safety rating1.00x

× vehicle age0.85x

= Full coverage estimate$1366

Coverage assumed: 100/300/100 liability + comprehensive/collision, $500 deductibles. Data sources: NAIC 2024 + HLDI loss studies.

Maintenance & Warranty

Recommended Gmc SIERRA DENALI Service Intervals

Oil change

8K mi / 12 mo

Tire rotation

8K mi

Brake fluid

36 months

Transmission fluid

45K mi

Engine coolant

150K mi

Spark plugs

100K mi

Cabin air filter

23K mi

Engine air filter

45K mi

Differential (AWD/4WD)

45K mi

Uses GM Oil Life System. Full-size trucks may have shorter differential and transfer case intervals if used for towing.

"Severe service" conditions (heavy towing, extreme temps, city stop-and-go) typically halve these intervals. Always consult your vehicle's owner's manual for the authoritative schedule.

Gmc New-Vehicle Warranty Coverage

Bumper-to-bumper (basic)

3 yr / 36K mi

Powertrain

5 yr / 60K mi

Hybrid/EV battery

8 yr / 100K mi

Corrosion (rust perforation)

6 yr / 100K mi

Roadside assistance

5 yr / 60K mi

These are the terms for a new Gmc. If you're buying a used 2011 SIERRA DENALI, remaining coverage is usually pro-rated from the vehicle's original in-service date. Not all coverage transfers between owners — check with a Gmc dealer for VIN-specific remaining warranty.

Estimated Repair Costs

OTHER(~50K mi)

$500

AIR BAGS(~50K mi)

$500

BODY/STRUCTURE(~50K mi)

$500

TRANSMISSION(~50K mi)

$500

WHEELS(~50K mi)

$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 40 owner complaints for this specific year, here's what to check or ask about:

☐
OTHER: 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
Typically appears around 50K miles. Repair cost ~$500
☐
AIR BAGS: CRACKED DASHBOARD STARTED AT LEFT CORNER OF PASSENGER SIDE AIRBAG THEN CRACKED ABOVE INSTRUMENT PANEL AFRAID OF FLYING DEBRIS AND PUNCTURE OF AIRBAG. CONSTANTLY HEAR POPPING IN THE DASH MY P/U HAD APPROX 57000 MI AT TIME OF INCIDENT
Typically appears around 50K miles. Repair cost ~$500
☐
BODY/STRUCTURE: 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
Typically appears around 50K miles. Repair cost ~$500
☐
TRANSMISSION: 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
Typically appears around 50K miles. Repair cost ~$500
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)