Is the 2015 Gmc DENALI reliable?

The 2015 Gmc DENALI has 27 complaints filed with NHTSA (2.7x the segment average). Our reliability verdict: below-average. Most common issue: LIGHTING problems.

What are common problems with the 2015 Gmc DENALI?

Top problems: LIGHTING (6 complaints, avg repair $500); TRANSMISSION (5 complaints, avg repair $500); ELECTRICAL (4 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2015 Gmc DENALI?

No recalls have been issued for the 2015 Gmc DENALI.

How much does it cost to insure a 2015 Gmc DENALI?

Estimated US average full-coverage insurance for the 2015 Gmc DENALI is approximately $1,478/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.

2015 Gmc DENALI

Problems, Recalls & Reliability Report

Below Average

Quick Summary

The 2015 Gmc DENALI has 27 owner complaints filed with NHTSA — that's 2.7x the segment average of 10. The most common issue is lighting problems (22% of all complaints), specifically: rear taillights have moisture in them. the moisture is constant in one and intermittent in the other. both have been replaced once by dealer 3 months ago. problem still exists.

1 crash report 1 injury

Total Complaints

Recalls Issued

—/5

Safety Stars

2.7x

vs Segment Avg

Known Problems(top 5 of 8)

LIGHTING

6 complaints

22%

• REAR TAILLIGHTS HAVE MOISTURE IN THEM. THE MOISTURE IS CONSTANT IN ONE AND INTERMITTENT IN THE OTHER. BOTH HAVE BEEN REPLACED ONCE BY DEALER 3 MONTHS AGO. PROBLEM STILL EXISTS
• BOTH LED BRAKE LIGHTS HAVE FAILED. IF YOU TAP THEM THEY WOK FOR A MINUTE BUT WHEN DRIVING THEY GO OUT AGAIN. THE SEAT VIBRATES TO ALERT YOU OF OBSTACLES BUT THE MOTOR IN THE SEAT ONLY WORK PERIODICALLY. THE REAR WINDOW WIPER HAS FAILED. THE YUKON HAS BEEN DRIVEN 3 YEARS AND 50K MI AND NOW NEED
• WE BOUGHT OUR 2015 DENALI 1 YEAR AGO AND HAVE APPROX 50,000 MILES AND THE PASSENGERS SIDE TAIL LIGHT IS OUT. AFTER RESEARCHING TAILLIGHT PROBLEMS FOR MY MAKE AND MODEL THIS SEEMS TO BE A VERY COMMON ISSUE. THIS SHOULD BE CONSIDERED AS A RECALL BUT WHEN LOOKED INTO, I SEE IT IS NOT. ITS A SHAME TO S

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

“REAR TAILLIGHTS HAVE MOISTURE IN THEM. THE MOISTURE IS CONSTANT IN ONE AND INTERMITTENT IN THE OTHER. BOTH HAVE BEEN REPLACED ONCE BY DEALER 3 MONTHS AGO. PROBLEM STILL EXISTS”

— NHTSA complaint filing

When Problems Appear on the 2015 Gmc DENALI

Based on 21 owner complaints that included an odometer reading. Median mileage at time of complaint: 50K miles. Most complaints cluster in the 30-60K miles range.

Overall complaint distribution by mileage

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 2015 Gmc 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

$1,478

Full coverage / month

$123

Liability only / year

$611

vs US avg

-12%

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 age0.92x

= Full coverage estimate$1478

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

Maintenance & Warranty

Recommended Gmc 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 2015 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

LIGHTING(~50K mi)

$500

TRANSMISSION(~50K mi)

$500

ELECTRICAL(~50K mi)

$500

STEERING(~50K mi)

$500

BRAKES(~50K mi)

$500

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

🔍 Pre-Purchase Inspection Checklist

Based on 27 owner complaints for this specific year, here's what to check or ask about:

☐
LIGHTING: REAR TAILLIGHTS HAVE MOISTURE IN THEM. THE MOISTURE IS CONSTANT IN ONE AND INTERMITTENT IN THE OTHER. BOTH HAVE BEEN REPLACED ONCE BY DEALER 3 MONTHS AGO. PROBLEM STILL EXISTS
Typically appears around 50K miles. Repair cost ~$500
☐
TRANSMISSION: LETTER FROM SENATOR FEINSTEIN INQUIRY ON BEHALF OF CONSTITUENT IN REGARDS TO HAVING PROBLEMS WITH GMC SIERRA DENALI PICKUP 2015. *LD THE CONSUMER STATED THE VEHICLE HAS HAD MULTIPLE ISSUES WITH THE SUSPENSION, TRANSMISSION, AND ELECTRONICS. THE VEHICLE WOULD RIDE ROUGH AND THE STABILITY LIGHT WOU
Typically appears around 50K miles. Repair cost ~$500
☐
ELECTRICAL: LETTER FROM SENATOR FEINSTEIN INQUIRY ON BEHALF OF CONSTITUENT IN REGARDS TO HAVING PROBLEMS WITH GMC SIERRA DENALI PICKUP 2015. *LD THE CONSUMER STATED THE VEHICLE HAS HAD MULTIPLE ISSUES WITH THE SUSPENSION, TRANSMISSION, AND ELECTRONICS. THE VEHICLE WOULD RIDE ROUGH AND THE STABILITY LIGHT WOU
Typically appears around 50K miles. Repair cost ~$500
☐
STEERING: INTERMITTENT POWER STEERING FAILURE TURNING AT LOW SPEEDS. ALMOST HIT A CAR WHILE TURNING IN A ROAD DUE TO LACK OF POWER STEERING WORKING PROPERLY.
Typically appears around 50K miles. Repair cost ~$500
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)