Bulletins
| Bulletin | Bulletin date | Replacement Bulletin | Item no. | Summary | Added |
|---|---|---|---|---|---|
| POWER TRAIN - AUTOMATIC TRANSMISSION | |||||
| 4133 | 4133A | 10022769 | Transmission slips, will not shift, ses light may be illuminated. *kb | 09/26/2007 | |
| 3931 | 09/28/2006 | 3931A | 10021018 | No movement when the shift lever is moved to d4 or d3. normal operation when moved to d2 d1 or reverse. *kb updated. *kb | 02/22/2007 |
| 050730017 | 02/01/2006 | 050730017B | 10017462 | 4l60-e/4l65-e automatic transmission/torque converter clutch (tcc) shudder, water in transmission. *tt | 11/08/2005 |
| 3170 | 3170C | 10010577 | Harsh 1-2 shift. *eh | 12/01/2004 | |
| 3136 | 3136A | 10010080 | The 4l60e/4l65e automatic transmission slip condition in 2nd, 3rd, or 4th gear. also to include the pontiac gto 2005. *tc | 11/04/2004 | |
| 3259C | 3259E | 10005514 | 4l80e, 4l85e whine noise in first and second gear. *tt | 03/01/2004 | |
| POWER TRAIN - AXLE ASSEMBLY | |||||
| 4030 | 4030A | 10021676 | New design front axle side bearing adjusters. *kb | 06/15/2007 | |
| POWER TRAIN - MANUAL TRANSMISSION | |||||
| 3136 | 3136K | 10021019 | Slip condition in 2nd, 3rd, or 4th. damaged 2-4 or 3-4 clutch. *kb updated 10/31/07. *nj | 02/22/2007 | |
| POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE) | |||||
| 05-04-21-003 | 01/01/2008 | 050421003C | 10017464 | Service 4wd light illuminated, diagnostic trouble code (dtc) c0374 set. *tt updated 10/05/07. *nj inspect wiring harness to transfer case speed sensors, replace wiring harness. updated 7/18/08 *pe | 11/08/2005 |
| 3424 | 3424A | 10017299 | Electronic transfer case unable to complete shift. *tt | 11/02/2005 | |
Consumer Complaints
| Fail date | miles | occurences | Purchase date |
|---|---|---|---|
| POWER TRAIN - AUTOMATIC TRANSMISSION | |||
| 05/21/2010 | 79100 | ||
| 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 neutroal). 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 remiained 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. | |||
| 02/10/2006 | 89596 | 1 | |
| 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 | |||
| 09/22/2006 | 9235 | 1 | 06/11/2006 |
| Tl*the contact owns a 2006 chevrolet avalanche 1500. the air bag light illuminated on the instrument panel. the dealer repaired the failure, but it recurred the following year. the failure was repaired a second time. the contact stated that the vehicle has been taken to the dealer repeatedly to have the air bag failure repaired. he also stated that the front seats were making strange noises. he took the vehicle to the dealer twice to have the seats repaired. the transmission also needed to be repaired. the contact stated that the air bag failure was a safety hazard. the failure mileage was 9,235 and current mileage was 45,000. updated 10/03/08 *bf the transmission would not move in forward gear. the dealer found the sprag broke and the clutches were burnt. the front door speaker made a buzzing noise. the dealer stated it was an internal failure. updated 10/06/08. *jb | |||
| POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE) | |||
| 09/20/2005 | 2 | 06/16/2005 | |
| 2006 chevrolet avalanche. consumer states that the check engine light is on. cause: the fuel tank pressure sensor internally open replaced: fuel tank pressure. *mc the consumer sated the 4-wheel drive activated on its own, and the traction control light illuminated. the transfer case was replaced. *jb | |||