2006 Chevrolet Avalanche 1500 transmission problems

Filed Jun 25, 2026 · Body, Suspension · WI

After purchasing my vehicle through a bank loan, the frame started to deteriorate resulting in suspension components to come loose and fall off. Lastly, rear driveshaft broke off, leaving me inoperable.

Filed Jan 9, 2025 · Body, Suspension · FL

The vehicle was sold with significant rust damage to the underbody of the truck. The truck parts are rusted to a point the suspension, and axel are about to fall out. The truck is leaking gasoline due to the amount of rust. The power steering that they fixed after one day driving it had issues when sold is still having issues leaking fluid. It has been deemed unsafe to drive on road. The dealership sold the vehicle in unsafe conditions, and will not rectify the situation. I have documentation, and photos of the damage to the vehicle.

Filed Apr 10, 2018 · Driver assistance, Transmission · 83,000 miles · CO

Driving down the road the truck engine will be running with no abnormal sounds, smells, leaks but will act as if not in gear. Rpm's will rev but truck will not move. Only after putting truck in park (lots of grinding noises) then pressing the 4wheel button then back to 2wheel (sometimes through two cycles) the truck will back into gear and operate properly. Took it to a transmission shop put it on the diagnostic machine and no error codes were given to give reason why the transfer case disengages randomly. Replaced the transfer switch per shop recommendation "just in case"it was okay for about a month then once again issues started again just the same as before.

Filed Jan 15, 2017 · Brakes, Fuel system · NE

I purchased the 2006 vehicle used in dec 2013. In 2014 the transmission went bad. In 2015 I replaced the transmission and brake pads & roaders.2016 replaced the fuel pump because it also went bad, replaced tires (normal wear), bought a new battery because it died. 2017 it needed two hub bearing and both front wheel hub replaced. This is an ongoing problem with this vehicle! I just found out my air bag sensor will need to be removed and replaced. All my money has been flushed down to this vehicle. I don't recommend anyone buying a chevy truck.

Filed Nov 27, 2016 · Transmission · 129,000 miles · WA

Transmission slipping. When traveling at shift point 1-2, 2-3 the engine rpms suddenly increase then return to nominal speed. The mileage is way to low for this behavoir. I believe gm should issue (or pay for) the parts (the toughened or improved parts) to correct this problem or re-reimburse the current owner for the retail cost of the gm (improved) parts if the owner chooses to have the work done else where. The shifting action is not firm, it's sloppy. At times you can't feel the shift in the conventional way but you can hear it.

Filed Aug 20, 2016 · Driver assistance, Transmission · 127,000 miles · PA

I backed out of my driveway stopped my truck like always put it in d to drive heard a loud clunk noise and now I have 1 and 2 gear only to use the truck was stationary was on a main road I changed the transmission fluid screens filters everything flushed it out and still the same thing a lot of people are saying it's the sprag unit I have no idea what that is I have only hauled a few things with it when we were moving we only moved eight miles down the road used a trailer and the tow gear that is on the truck. Also about a month before this happened the stability system light came on and said disabled but has not done it since also my truck is very clean always serviced according to the manual and is in very very good condition

Filed Apr 30, 2016 · Transmission · 69,000 miles · MA

Takata recall transmission suddenly stopped. Only drives in first gear, has 70,000 miles, has been maintained. While driving on 128 south in danvers, ma at 4:30 the truck became sluggish, grew worse with in seconds causing my top acceleration to decrease to 20 MPH at best, was able to get off after a mile and speed decreased to 10 MPH. I lost all gears aside from first. I have inquired with a few mechanics getting mixed answers ranging from total rebuild to solenoids. Truck is dead with 70,000 miles.

Filed Jul 2, 2015 · Transmission · 50,000 miles · IL

For no reason and without warning, after a "clunk" noise the truck was coasting. Only 1st, 2nd, and reverse gears work.

Filed May 23, 2010 · Transmission · 79,100 miles · NY

2006 chevrolet avalanche 1500 4wd in 2wd hi, driving at 55 MPH with transmission in d, engine revved freely as if transmission in neutral. Coasted to a stop onto shoulder, shifted into park, released foot brake, vehicle began to roll forward (downhill), apparently because transfer case shifted into neutral. Ses indicator not on. Turned off engine. No codes (had code reader in glove box). Turned engine on, shifted transmission into d and felt transmission engage (apparently, transfer case had engaged from neutral). Accelerated gradually and drove down highway for 1/4 mile and when accelerator pedal was released, transfer case shifted into neutral, again, engine revving freely with transmission still in d. Coasted to a stop on shoulder, pressed 4wd hi and felt transfer case engage, pressed 2wd hi and felt transfer case disengage but now in 2wd hi instead of neutral. Accelerated gradually and drove down highway and when accelerator pedal was released, transfer case shifted into neutral, again, engine revving freely with transmission still in d. Coasted to a stop on shoulder, and repeated above sequence on transfer case to shift into 2wd hi. Shifted transmission into 3, accelerated gradually and drove down highway, transfer case remained in 2wd hi. Slowed down to a stop on shoulder, turned off engine, restarted engine and shifted transmission into d, accelerated gradually and drove down highway and when accelerator pedal was released, transfer case shifted into neutral once again. After coasting to a stop, repeated sequence to engage transfer case into 2wd hi, shifted transmission into 3 and drove vehicle to mechanic. Still diagnosing issue.

Filed Feb 11, 2010 · Transmission · 89,596 miles · TX

Driving home last night, I lost 3rd and 4th gears in my transmission under normal acceleration. I have an '06 chevrolet avalanche z71 with less than 89,600 miles on it. I have never towed anything except for a uhaul trailer once for about 250 miles. I was on the highway when this happened, traveling 50-55 MPH when it occurred. I was able to coast to a stop on the shoulder of the highway without further incident, however I was almost rearended by following traffic the moment it happened because of the sudden decrease of speed without warning. The transmission gave no warning before it broke. I still had 1st and 2nd gears as well as reverse. I have spoken with a mechanic and he estimates repair costs to be around $3000. I have checked several forums for people who have experienced similar problems and have found that this is a "common" problem happening to avalanches that are 2-6 years old and having as few as 14,000 miles on them. My truck is out of warranty, but this is a pervasive problem that has existed since 2002 according to other avalanche owners. The forums I found the information on are; chevyavalanchefanclub.com, avowners.com, and chevyavalanche.com. This is more than an isolated incident, having happened to many people who own avalanche's as evidenced on the forums. This defect is known by gm as evidenced by there own technical service bulletin number "08-07-30-027 june 08 a/t - no movement in drive or 3rd gear". It is a flawed design or flawed parts are being used. Gm should recall all affected trucks with this particular transmission and take corrective action before someone is fatally injured due to a failure on a congested highway. An investigative look at gm's repair records to see how many trucks have been in for repairs, that have experienced the same or similar failures, would probably warrant a federal investigation into the safety of this product, and whether gm should be compelled to institute a recall.