"How reliable is the 2018 Gmc Sierra Denali?"

"Based on 25 NHTSA complaints, the 2018 Gmc Sierra Denali has a median complaint mileage of 20350 miles. The most common issue is ENGINE."

"What are common problems with the 2018 Gmc Sierra Denali?"

"The most frequently reported component in NHTSA complaints for the 2018 Gmc Sierra Denali is ENGINE, accounting for a significant portion of the 25 total complaints filed."

2018 Gmc Sierra Denali: Reliability Data

Source: NHTSA — 25 complaints

Total Complaints

20,350mi

Median Mileage

ENGINE

Top Issue

Crash Reports

When Do Complaints Happen?

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

14,700 25th Percentile

20,350 Median Mileage

44,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ENGINE

SERVICE BRAKES

STEERING

STRUCTURE:BODY

ELECTRONIC STABILITY CONTROL (ESC)

EXTERIOR LIGHTING

EXTERIOR LIGHTING:HEADLIGHTS

UNKNOWN OR OTHER

SUSPENSION

WHEELS

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"TL* THE CONTACT OWNS A 2018 GMC SIERRA DENALI. WHILE DRIVING VARIOUS SPEEDS, THE HEADLIGHTS MOVED WHEN DRIVING OVER A BUMP IN THE ROAD. THE VEHICLE WAS TAKEN TO WHITAKER BUICK GMC (131 19TH ST SW, FOREST LAKE, MN 55025, (651) 464-5612) AND MCCARTHY AUTO WORLD (3350 129TH AVE NW, COON RAPIDS, MN 5544..."

"TL* THE CONTACT OWNS A 2018 GMC SIERRA DENALI. THE CONTACT STATED THAT THE HEADLIGHTS VIBRATED AND BOUNCED WHILE THE VEHICLE WAS IN MOTION. WHILE DRIVING ON ROUGH TERRAIN AND ALSO WHEN APPROACHING ONCOMING TRAFFIC, IT WAS DIFFICULT FOR THE CONTACT TO SEE THE ROAD. THE VEHICLE WAS TAKEN TO THE DEALER..."

"TL* THE CONTACT OWNS A 2018 GMC SIERRA DENALI. THE CONTACT RECEIVED A RECALL NOTIFICATION FOR NHTSA CAMPAIGN NUMBER: 19V328000 (ENGINE). THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE DEALER WAS NOT CONTACTED. THE MANUFACTURER WAS NOTIFIED OF..."

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

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