"How reliable is the 2008 Gmc Sierra 3500?"

"Based on 26 NHTSA complaints, the 2008 Gmc Sierra 3500 has a median complaint mileage of 70500 miles. The most common issue is AIR BAGS."

"What are common problems with the 2008 Gmc Sierra 3500?"

"The most frequently reported component in NHTSA complaints for the 2008 Gmc Sierra 3500 is AIR BAGS, accounting for a significant portion of the 26 total complaints filed."

2008 Gmc Sierra 3500: Reliability Data

Source: NHTSA — 26 complaints

Total Complaints

70,500mi

Median Mileage

AIR BAGS

Top Issue

Crash Reports

When Do Complaints Happen?

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

37,918 25th Percentile

70,500 Median Mileage

84,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

AIR BAGS

TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

ELECTRICAL SYSTEM

FUEL SYSTEM, DIESEL

STRUCTURE

SERVICE BRAKES, HYDRAULIC

FUEL SYSTEM, GASOLINE

ENGINE

FUEL/PROPULSION SYSTEM

UNKNOWN OR OTHER

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"THE WATER IN FUEL SENSOR ON MY 2008 GMC 3500 HD WITH A 6.6L DURAMAX DIESEL. I HAD TO TAKE IT IN TO THE DEALER THEY TOLD ME THAT I HAD WATER IN MY FUEL. THE HAD TO FLUSH MY FUEL SYSTEM AND REPLACE THE WATER IN FUEL SENSOR THEY CHARGED ME $840 FOR THIS REPAIR. BUT THE WEIRD THING IS THE LIGHT NEVER C..."

"TL*THE CONTACT OWNS A 2008 GMC SIERRA 3500. WHILE THE CONTACT WAS DRIVING IN REVERSE APPROXIMATELY 2 MPH, THE BACKUP INDICATORS WOULD NOT OPERATE. THE FAILURE OCCURRED SPORADIC. THE VEHICLE WAS TAKEN TO THE DEALER ON FIVE DIFFERENT TIMES FOR THE IDENTICAL FAILURE. THE TECHNICIAN INFORMED THAT THERE ..."

"MY 2008 GMC SIERRA 3500HD HAS A CHATTER WHEN TURNING, GM IS AWARE OF THE PROBLEM AND HAS A BULLETIN FOR A REPAIR, HOWEVER THE REPAIR MAY OR MAY NOT COMPLETELY SOLVE THE ISSUE IT DIDN'T ON MINE. WHILE TURNING THE REAR AXLES STAYS IN A LOCK POSITION AND DOESN'T ALLOW THE REAR TIRES TO TURN SEPARATE SP..."

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