IllustrationTRANSMISSION COOLING LINES LEAKING. *TR
2006 GMC Sierra 3500
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all Sierra 3500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 10 of 11 reports include usable mileage. There isn’t enough coverage to show a useful chart.
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Power Train. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Steering. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Air Bags. Review the 2 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
1 crash reports1 fire reports1 injury reports
Power Train complaints
3 reportsTL* THE CONTACT OWNS A 2006 GMC SIERRA 3500. WHILE EXAMINING THE VEHICLE HE NOTICED FLUID LEAKING FROM UNDER THE FRONT PASSENGER SIDE OF THE VEHICLE. THE VEHICLE WAS TAKEN TO THE DEALERSHIP AND HE WAS ADVISED THAT THE TRANSMISSION COOLING LINES NEEDED TO BE REPLACED. THERE WERE NO PRIOR WARNINGS. THE CURRENT AND FAILURE MILEAGES…
Read full complaint
TL* THE CONTACT OWNS A 2006 GMC SIERRA 3500. WHILE EXAMINING THE VEHICLE HE NOTICED FLUID LEAKING FROM UNDER THE FRONT PASSENGER SIDE OF THE VEHICLE. THE VEHICLE WAS TAKEN TO THE DEALERSHIP AND HE WAS ADVISED THAT THE TRANSMISSION COOLING LINES NEEDED TO BE REPLACED. THERE WERE NO PRIOR WARNINGS. THE CURRENT AND FAILURE MILEAGES WERE 44000.
TRANSMISSION COOLING PIPES HAVE BEEN REPLACE TWO TIMES IN LAST THAN 20 MONTHS BECAUSE OF FLUID LEAKING. *TR
Official recalls
0No recalls in this snapshot.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
0No exact-year investigations in this snapshot.