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definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
28,994 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2006 Chevrolet Silverado 2500 transmission problems

transmission problem

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2006 Chevrolet Silverado 2500 Owner Comments

problem #8

Aug 102013

Silverado 2500 4WD 8-cyl

  • 14,285 miles


Service brakelines rotted and caused a complete loss of service brakes - while driving and close to home - used emergency brakes and low gear to get to home. Spoke to friend at Chevy dealer. They are having problems with this truck series due to corrosion and premature rusting. Truck is currently in garage due to failure (corrosion) of transmission cooling lines. Current mileage 15,211. Lost both anti-lock brake modules and alternator and temperature sensors.

- Hazle Twp, PA, USA

problem #7

Mar 012008

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • 35,000 miles
My transmission cooler lines were leaking and I'm concerned about it due to the transmission fluid being a combustible material. If this material dripped onto a hot exhaust and ignited while parked in the "attached" garage of our home, it could pose a major safety hazard...not to mention it could do to the neighbors home being relatively close. Thank you for your time.

- Orchard Park, NY, USA

problem #6

Jan 252008

Silverado 2500 8-cyl Diesel

  • Automatic transmission
  • 44,000 miles
Leaking trans lines on 06 Chevy allison trans.

- Red Deer, 00, USA

problem #5

Nov 282007

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • 42,000 miles


Transmission lines that run from the transmission cooler next to the radiator continue to leak. The lines seem to leak more in colder climates. I am on my third set in 60 days. Transmission fluid was a flammable substance the last I knew.

- Reedsburg, WI, USA

problem #4

Jul 172007

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • miles
Transmissions lines are continuing to leak. Have been to the dealer twice this year. Dealer has replaced cooler lines under warranty. Truck only has 32000 miles on it. Dealer needs to come up with a permanent fix, or it is going to cost the consumer a lot of money to keep having the transmission lines replaced.

- Arlington, WA, USA

problem #3

Feb 042008

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • 56,665 miles
Lower transmission line leaking again shortly after being replaced with a new one. This is happening to very many truck numerous times. 2006 2500 hd duramax /alison.

- Irvine, KY, USA

problem #2

Feb 012008

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • 20,000 miles
The allison automatic transmission cooler lines are leaking. This poses a fire hazard. GM needs to redesign the hoses that connect the transmission and transmission cooler. Many others are having this same problem and have had the lines replaced multiple times.

- Corona, CA, USA

problem #1

Jan 032008

Silverado 2500 4WD 8-cyl Diesel

  • Automatic transmission
  • 20,000 miles
I have a 2006 3/4 ton pick up with the duramax diesel and alison transmission. In November of 2006 at about 20K miles, a low pressure transmission cooling line (part number 219989580) developed a major leak and required repair. Within weeks, the replaced line failed and the dealer informed us that many trucks of the same design were failing for the same part. It took weeks to get a replacement part for GM. Feed back from other GM dealers indicated that the problem was wide spread. When a replacement part was finally provided, we were informed by GM western region service that a design "fix" had been implemented and that the truck was safe to drive. Three weeks ago, (45,000 miles) my truck started leaking transmission fluid again. An inspection by the dealer revealed that not only the same line was leaking again but that two other lines of the same design were also leaking. This dealer, E&L motors in kemmerer had already seen more than a dozen trucks in the past few weeks with the same problem and was frustrated because replacement lines from GM would start leaking within days of installation. We were told by the service manager that there was a rumor that GM would be doing a recall on this part. In the mean time, I am not getting any direct information and the corrective action GM is telling it's dealers is to have the owner check the transmission fluid frequently, a special fluid which is not available through anyone except an authorized GM dealer. Recent contacts with other GM dealers have exposed the same problem with "dozens" of trucks in our area which are also waiting for a reliable replacement part. I use this truck for work. During the winter months, my biggest concern is having one of the leaking lines blow leaving me stranded in freezing weather where cell coverage even on the interstate is not always possible.

- Robertson, WY, USA

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