TL* THE CONTACT OWNS A 2008 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 40 MPH, THE VEHICLE LOST POWER. ALSO, THE TRACTION CONTROL, SERVICE ENGINE, AND REDUCED ENGINE POWER INDICATORS ILLUMINATED. THE VEHICLE WAS TAKEN TO THE DEALER (BETTEN BAKER BUICK, 2901 28TH ST, GRANDVILLE, MI, 49418, PHONE NUMBER: 616-530-9191) WHERE IT WAS DIAGNOSED THAT THE THROTTLE BODY NEEDED TO BE REPLACED. THE VEHICLE…
2008 GMC Sierra powertrain problems
severe 7 complaints filed with NHTSA · avg repair $2,500
Complaints
7
Recalls
0
Crashes
1
Avg fix
$2,500
What owners are reporting 2 most recent
TRANSMISSION LINES LEAKING AROUND CRIMPED PART OF LINE. RESEARCHING THIS ISSUE ONLINE,MANY GMC/GM VEHICLES ARE HAVING THIS ISSUE. THERE SHOULD BE AN EFFORT BY GM TO INSTALL BETTER LINES. *TR
Common questions
How serious is the powertrain problem on the 2008 GMC Sierra?
It's a meaningful issue. 7 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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