2006 CHEVY SILVERADO 2500HD HAS DEVELOPED A TRANSMISSION COOLER LINE LEAK AT THE METALLIC COUPLER. VEHICLE ONLY HAS LESS THAN 50K MILES UNDER LIGHT LOAD CONDITIONS. NEVER TOWED ANYTHING OVER 3KLBS. I UNDERSTAND THIS IS A VERY HIGH FAIL ITEM AND EVEN THEIR IMPROVED LINES ARE LEAKING AS WELL. THIS SHOULD BE A RECALL ITEM AND REPLACED AT NO COST TO THE CUSTOMER. *TR
2006 chevrolet Silverado powertrain problems
severe 69 complaints filed with NHTSA · avg repair $2,500
Complaints
69
Recalls
0
Crashes
3
Avg fix
$2,500
What owners are reporting 4 most recent
THE VEHICLE MAKES A HIGH PITCH NOISE WHILE LIGHTLY ACCELERATING. IT STRONGLY APPEARS TO BE COMING FROM THE TRANSMISSION. THE DEALERS TO DATE HAS REFUSED TO ACKNOWLEDGE THIS PROBLEM WITH MY VEHICLE. I HAVE HAD THIS COMPLAINT SINCE THE FIRST WEEK OF PURCHASING THE VEHICLE. I PRESENTLY HAVE 2200 MILES. *JB
2006 CHEVY SILVERADO HD DIESEL WITH ALLISON TRANS-- TRANSMISSION COOLER LINES LEAKING, DEALER SAID THERE HAS BEEN NO KNOWN PROBLEM. I SEARCHED ONLINE AND FOUND HUNDREDS OF SIMILAR COMPLAINTS. SO I WAS FORCED TO PAY $700 TO HAVE THE LINES REPLACED, WHICH WILL PROBABLY END UP LEAKING AGAIN. THIS IS OBVIOUSLY A DEFECT, AS I HAVE 3 OTHER CHEVY TRUCKS, NONE OF WHICH HAVE EVER LEAKED FROM THE TRANS LINE…
The auxiliary transmission fuel pump system is prone to failure. This makes it so the start/stop feature will not work, as the vehicle will stall when stopped (causing an unsafe situation), and it cannot pass state inspection. The part is entirely unavailable from Chevy, and results in the vehicle being scrapped. There is no way to permanently bypass this system.
Common questions
How serious is the powertrain problem on the 2006 chevrolet Silverado?
It's a meaningful issue. 69 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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