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U.S. public vehicle records

2015 Gmc SIERRA DENALI problems and owner complaints

Explore the records behind recurring owner reports.

Key facts

22 owner complaints analyzed

0 distinct recall campaigns

47,800 mi median reported failure mileage

Scope: 2015 model year. Data snapshot: . 19 complaints include usable failure mileage.

Owner-reported patterns

Most common problems

Service Brakes is the most frequently named component, appearing in 7 of 22 complaints (31.8%). A complaint can name multiple components.

Recurring terms in complaint narratives
TopicMatching reportsShare of complaints
Braking behavior1045.5%
Transmission and shifting313.6%
Electrical and battery issues29.1%
Steering behavior29.1%

Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.

Component breakdown

Number of unique complaints naming each component. Top eight shown.

Service Brakes
7
Power Train
5
Electrical System
3
Unknown Or Other
2
Air Bags
1
Engine
1
Engine And Engine Cooling
1
Fuel System, Diesel
1
Component breakdown data
CategoryCount
Service Brakes7
Power Train5
Electrical System3
Unknown Or Other2
Air Bags1
Engine1
Engine And Engine Cooling1
Fuel System, Diesel1

Service Brakes: 7; Power Train: 5; Electrical System: 3; Unknown Or Other: 2; Air Bags: 1; Engine: 1; Engine And Engine Cooling: 1; Fuel System, Diesel: 1

Reported problems by failure mileage

Complaint counts in mileage bands. These are not failure rates per vehicle or mile.

Under 25,000
4
25,000 to 49,999
7
50,000 to 74,999
6
75,000 to 99,999
1
100,000 to 149,999
0
150,000 and above
1
Reported problems by failure mileage data
CategoryCount
Under 25,0004
25,000 to 49,9997
50,000 to 74,9996
75,000 to 99,9991
100,000 to 149,9990
150,000 and above1

Under 25,000: 4; 25,000 to 49,999: 7; 50,000 to 74,999: 6; 75,000 to 99,999: 1; 100,000 to 149,999: 0; 150,000 and above: 1

25,000 to 49,999 miles has the most reports with usable mileage (7). 3 complaints have missing, zero or invalid mileage.

Complaints over time

Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.

2017
6
2018
6
2019
4
2020
3
2024
1
2025
2
Complaints over time data
CategoryCount
20176
20186
20194
20203
20241
20252

2017: 6; 2018: 6; 2019: 4; 2020: 3; 2024: 1; 2025: 2

Pattern summary

Service Brakes leads the component reports. Braking behavior appears in 10 complaint narratives. Transmission and shifting appears in 3 complaint narratives. Electrical and battery issues appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.

Calculated from recorded counts. An AI narrative has not been published for this selection.

Complaint evidence

Examples provide context, not a representative sample or a verified diagnosis.

Owner report 11033181 · 2017-10-13 (October 13, 2017)

TL* THE CONTACT OWNS A 2015 GMC SIERRA DENALI. THE CONTACT STATED THAT THE VEHICLE EXHIBITED NUMEROUS ELECTRICAL FAILURES. THE FAILURE CAUSED THE STEERING WHEEL TO LOCK, THE BRAKE SYSTEM NOT TO ENGAGE, AND THE INSTRUMENT PANEL AND ALL OTHER ELECTRICAL SYSTEMS IN THE VEHICLE NOT TO OPERATE NORMALLY. THE VEHICLE WAS TAKEN TO MARTY'S BUICK GMC (5 COLLECTION WAY, KINGSTON MA, 02364, [phone removed]) SEVERAL TIMES FOR THE FAILURE. THE CONTACT STATED THAT THE DEALER REPLACED WIRES, BUT THE FAILURE WAS NOT CORRECTED. THE CONTACT DID NOT KNOW THE NAME …

Owner-reported narrative. 15,000 miles reported. Look up ODI 11033181 at NHTSA ↗

Owner report 11066885 · 2018-02-04 (February 4, 2018)

HARD BRAKE PEDAL. AT LOW SPEED THE BRAKE PEDAL GETS REALLY HARD AND MAKES IT HARD TO STOP THE TRUCK. PEDAL HAS TO GET PUSHED REALLY HARD TO BARELY STOP FROM HITTING OTHER VEHICLES. ONGOING ISSUE.

Owner-reported narrative. 56,000 miles reported. Look up ODI 11066885 at NHTSA ↗

Owner report 11180690 · 2019-02-17 (February 17, 2019)

WHEN COMING TO A STOP, APPLYING A STEADY AMOUNT OF BRAKE PRESSURE THE TRANSMISSION SHIFTS AND LOSES ALL FORMS OF ENGINE BRAKING CAUSING THE TRUCK TO SPEED UP AND OVERSHOOTS THE STOPSIGN.

Owner-reported narrative. 55,000 miles reported. Look up ODI 11180690 at NHTSA ↗

Owner report 11287131 · 2019-12-05 (December 5, 2019)

TRANSMISSION IS NOT ABLE TO BE FIXED. THREE REPAIRS AND GM CAN'T FIX. TRANSMISSION JERKS, SLIPS, CLUNKS. UNCOMFORABLE TO DRIVE. I AM STUCK WITH SUBPAR VEHICLE. GM HAS BEEN HORRIBLE TO WORK WITH. 17 RECALLS? WHY CANT GM MAKE A SOLID RELIABLE VEHICLE AFTER 100 YEARS IN BUSINESS?

Owner-reported narrative. 3,977 miles reported. Look up ODI 11287131 at NHTSA ↗

Owner report 11115739 · 2018-08-04 (August 4, 2018)

VEHICLE STARTED SHOWING "SERVICE LANE DEPARTURE SYSTEM, SERVICE PARK ASSIST, SERVICE TRAILER BRAKE SYSTEM" ALARMS WHILE DRIVING. UPON TAKING IT TO THE DEALER FOR SERVICE IT WAS FOUND TO HAVE BROKEN WIRING FOR HAPTIC MOTOR FOR DRIVERS SEAT. NOT ONLY DID THIS CAUSE A POSSIBLE SAFETY ISSUE WITH THE LANE DEPARTURE SYSTEM AND TRAILER BRAKE SYSTEM NOT WORKING CORRECTLY, BUT IT ALSO CAUSED A POSSIBLE FIRE CONCERN DUE TO BROKEN WIRING.

Owner-reported narrative. 22,567 miles reported. Look up ODI 11115739 at NHTSA ↗

Owner report 11055771 · 2017-12-20 (December 20, 2017)

TL* THE CONTACT OWNS A 2015 GMC SIERRA DENALI. WHILE DRIVING APPROXIMATELY 60 MPH, THE STEERING LOST POWER AND THE POWER STEERING WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS TOWED TO THE DEALER (SEWELL BUICK GMC OF DALLAS IN DALLAS, TX, PHONE NUMBER: [phone removed]) WHERE A DIAGNOSTIC TEST WAS PERFORMED. THE CONTACT WAS NOT GIVEN THE RESULTS OF THE TEST. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND OFFERED TO PAY A PERCENTAGE OF THE REPAIR COSTS. THE FAILURE MILEAGE WAS 39,900. *BF UPDATED 8/28/18*JB

Owner-reported narrative. 39,900 miles reported. Look up ODI 11055771 at NHTSA ↗