Recalls


CampaignManufacturerManufacturing dateType# of units affectedDate Owner notified MfgRecall Initiated byManufacturers of recalled vehicles/productsReport Recieved DateRecord Creation DateRegulation Part NumberFMVSS Number
POWER TRAIN - AUTOMATIC TRANSMISSION
03V075000GENERAL MOTORS CORP.from 04/01/2002 to 09/30/2002V (Vehicle)51116705/29/2003MFRGENERAL MOTORS CORP.03/06/200303/17/2003571114
Defect SummaryCertain sport utility vehicles fail to comply with the requirements of federal motor vehicle safety standard no. 114,
Consequence SummaryThese overrides are not permitted unless the vehicle has a locking steering column.
Corrective SummaryDealers will eliminate these conditions by disabling the overrides. owner notification began on may 29, 2003. owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact chevrolet at 1-800-222-1020, gmc at 1-800-462-8782, oldsmobile at 1-800-442-6537, or hummer at 1-866-486-6376.
NotesGm recall no. 03012. customers can also contact the national highway traffic safety administration

Bulletins


BulletinBulletin dateReplacement BulletinItem no.SummaryAdded
POWER TRAIN
00773100171904l60e, 4l65e replacement valve body gaskets does not seem to fit. *tt10/27/2005
3420A10017010Ping, pop or click noise from under the rear. *sc10/20/2005
313810011821Reduced power light on and diagnostic trouble code p1680 p1221 and or p1271 stored in the powertrain control module. *eh02/01/2005
322212/01/20073222D10010630Intermittent boom, rumbling noise at highway speed. *tt updated 2/27/08. *nj12/02/2004
30023002D100088024l60e/4l65e intermittent neutral condition while accelerating from a stop or while driving. *tt 1999-2006 gm cars, light duty trucks and utilities. *tt08/23/2004
1108200211/08/200210008619Shutter concern during low speed turning maneuvers for all-wheel drive vehicles. *tt08/10/2004
0208601/01/2004100077824l60e, 4l65e intermittent neutral from a stop or steady speed. *tt07/12/2004
0203001/01/200410007750Ping, pop or click noise from the propeller shaft. service vme. *tt07/09/2004
0211701/01/200410007448Tccm will not program through tis. *mj06/23/2004
0159901/01/2004100072374l60e, 4l65e forward and low reverse waved steel clutch plate appearance change. *tt06/04/2004
03042100506/01/200310006121Service 4wd light on, 4wd inoperative, diagnostic trouble codes c0300 and/or c0305 set. *tt04/19/2004
010730002C08/01/2003010730002B10004354Malfunction indicator lamp (mil) is on; the transmission is stuck in third gear; and / or the instrument cluster is inoperative. *tt12/03/2003
0141011/18/200310004214Poor performance from a stop in 2wd, auto or 4wd hi. 2003, 2003 cadillac ext also included. *tt11/21/2003
06190306/19/200310003710Unusual vibration felt at idle or at very low rpm during parking lot maneuvers. also residence noise accompanying the vibration. *tt10/28/2003
05220305/22/200310003659Product field action 03012. vehicles are equipped with a mechanical override that could allow the ignition key to be removed with the shift lever in a position other than park. in addition, these vehicles have an override that can allow t10/27/2003
02042100810/01/200210000174Shudder, rocking motion, binding, feels like vehicle is stuck in 4wd (crow hop) when turning at low speeds. *tt02/14/2003
POWER TRAIN - AUTOMATIC TRANSMISSION
05073003111/01/2005100187214l60-e automatic transmission torque converter clutch (tcc) shudder, water in transmission (repair transmission and replace transmission filler tube, level indicator and seal). *ak01/11/2006
351610017393Vibration felt and heard at low rpm during parking lot maneuvers. *tt11/04/2005
1120200311/20/200310013261Rattle noise underneath the vehicle or an automatic transmission fluid leak. *eh04/13/2005
04073003508/01/200410011217Release of rear transmission mount separate from exhaust mount. *tt01/11/2005
04073000201/01/200410011130Rattle type noise coming from under the vehicle. *tt01/03/2005
31363136A10010080The 4l60e/4l65e automatic transmission slip condition in 2nd, 3rd, or 4th gear. also to include the pontiac gto 2005. *tc11/04/2004
03073005611/01/2003100055664l60-e automatic transmission oil pump first and second design identification. *tt03/04/2004
0070201/01/200400702B10005476Slip condition in 2nd, 3rd or 4th damaged 2-4 band 3-4 clutch on the 4l60e/4l65e automatic transmission. *tt *mj03/01/2004
010730038B10/01/2005010730038C10005162The service engine soon lamp is illuminated, no 3rd and 4th gear, the transmission does not shift correctly, the transmission feels like it shifts to neutral or a loss of drive occurs. *tt02/09/2004
0143201/01/200310004412Automatic transmission poor acceleration, performance. *tt12/05/2003
020421008A02/01/200302042100810001101Shudder, rocking motion, binding, feels like vehicle is tuck in 4wd when turning at low speeds. *tt04/14/2003
03073000103/01/2005030730001A10000943Transmission slipping or torque converter clutch (tcc) inoperative with no service engine soon (ses) light displayed and no diagnostic trouble code (dtc) p1870. *tt update. *tt04/04/2003
POWER TRAIN - AUTOMATIC TRANSMISSION - CONTROL MODULE (TCM, PCM)
306112/01/20073061F10023773Dtc c0327 with or without additional dtc's setting. with four wheel drive (4wd) only. *nj01/31/2008
0148301/01/200410005496Vehicle has no pcm (power train control module) communication with tech 2. sit bulletin 1400427. *tt03/01/2004
POWER TRAIN - AUTOMATIC TRANSMISSION - COOLING UNIT AND LINES
PIT-472210/01/200810026804Gmc: fluid leak from transmission oil cooler lines due to corrosion. all 2000-2006 light duty trucks equipped with the light duty automatic transmission. *pe12/18/2008
0157301/01/200401573A10005419Rattle noise and/or transmission fluid leak from transmission cooler line contact with catalytic converter. *tt *mj02/25/2004
POWER TRAIN - AUTOMATIC TRANSMISSION - LEVER AND LINKAGE - COLUMN SHIFT
020730024A08/01/2005020730024B634999Diagnosis of cracked or broken transmission case. *tt 2006 and prior cars and light duty trucks. *tt10/11/2002
02042100607/01/2002634893Some customers may comment that the 4wd/awd indicator lights on the selector switch do not work or the 4wd/awd system may be inoperative. *tt10/10/2002
POWER TRAIN - AXLE ASSEMBLY
317710010599Repeat front axle fluid leak. *eh12/01/2004
03190303/19/200310001297Rear axle pinion seal leak condition. *tt04/28/2003
03041900209/01/2004030419002A10001123Squeak, squeal or whistle noise from front axle. *tt04/15/2003
03041700212/01/2006030417002A10001111Whine noise from rear axle. *tt04/15/2003
POWER TRAIN - DRIVELINE
04042100105/01/200410008503Delayed engagement of front wheels during a slip condition. *mj08/03/2004
POWER TRAIN - DRIVELINE - DRIVESHAFT
SB-070417001D05/01/200910030590General motors: a bump or thump noise is heard coming from the rear suspension or felt in the floor. the information affect vehicles with g67 automatic level control rear suspension. *pe10/23/2009
POWER TRAIN - MANUAL TRANSMISSION
31363136K10021019Slip condition in 2nd, 3rd, or 4th. damaged 2-4 or 3-4 clutch. *kb updated 10/31/07. *nj02/22/2007
POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE)
04042100412/01/2004100174424wd switch indicator lights flashing, 4wd inoperative, diagnostic trouble codes c0327, p0550 set. *tt11/08/2005
05-04-21-00301/01/2008050421003C10017464Service 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 *pe11/08/2005
34243424A10017299Electronic transfer case unable to complete shift. *tt11/02/2005
335110014853Intermittent malfunction indicator lamp (mil) with diagnostic trouble code (dtc) c0374 or erratic 4wd/awd operation. *tt05/10/2005
0913200209/13/200210009451This message covers comments that the service four-wheel drive indicator is illuminated or four-wheel drive is inoperable. *tt09/30/2004
0184301/01/200401843A10007961Calibration for improved transfer case operation in awd mode. *tt07/19/2004
020421006C03/01/2004020421006D10004357Inoperative 4wd/awd lamps, inoperative 4wd/awd system. *tt12/04/2003
01446A01/01/200401446C10004255Service 4wd light on no codes besides u1000 codes. *tt11/24/2003
020421002A02/01/200302042100210001144Service 4wd indicator illuminated, diagnostic trouble code (dtc) b2725 set, transfer case selector switch is in one position - indicator lamp indicates another range is selected. *tt04/17/2003
020421006A10/01/200202042100610000173Inoperative 4wd/awd lamps, inoperative 4wd/awd system. *tt02/14/2003

Consumer Complaints


Fail datemilesoccurencesPurchase date
POWER TRAIN
08/17/2012771411
 The gear shift selector cable became disengaged from the transmission while backing out of a parking spot. according to my mechanic, there is a small plastic bushing that became brittle and fell off causing the failure of the cable to maintain a connection with the transmission. this caused my transmission to become locked in the park position and unable to be moved into any other drive. while i was in a safe location, i'm concerned that other drivers in similar situations will become stranded in locations that are not safe. i conducted a recall search and found that this item has not been recalled. i placed a call to general motors and lodged a complaint. according to gm, they have received a number of complaints about this issue but are not issuing a recall at this time. i asked gm to provide me the number of complaints they have received about this and they declined to give me that information. i am seeking to file this complaint, have it reviewed, and determine whether a recall should be issued for this vehicle. *tr
08/15/2008420001
 2003 gmc envoy sle with 42,000 miles. check 4 wdrive light came on then went back off. dealer stated that the tccm had to be reprogrammed due to a bulletin. it cost me out of pocket no warranties cover this. also the fan clutches went out but was replaced by extended warranties. i'm also told by dealer that the steering links are worn & should be replaced. this too is at my cost. i have only had this car 1 year. these happened with just a few weeks of each other. *tr
10/26/200519232309/27/2003
 Electronic problem with 4wd was supposedly corrected in 2004, transfer case for 4wd was replaced in april 2005, and 4wd failed again during first day trying to use it during icy conditions after it was repaired in april. had to drive on dangerous, slick roads without 4wd from fairbanks to palmer, ak. this is a major safety issue in alaska where winter driving can be very hazardous without 4wd. have had it into dealer several times for loud squeak under vehicle when making turns or going over bumps at slow speeds. no corrective action by dealer. could not get vehicle out of park. had to have it towed to dealership. they disconnected something and told me to be careful because whatever they did would allow the vehicle to be put into drive without having brakes engaged! had to drive it this way for several weeks until they got replacement part. have had other problems with climate control, wind noise around windows, and more. none repaired satisfactorily. *nm
06/28/20031
 With about 1100 miles on my brand new car , the 4wd light came on. not happy about this purchase. *ak
POWER TRAIN - AUTOMATIC TRANSMISSION
05/14/201095000
 The transmission failed in my 2003 gmc envoy with approx 95,000 miles. while driving down the road i went to pass a slow moving vehicle. as the transmission down shifted there was a bang so i pulled over to look under the truck, and made sure nothing had fallen off. i got back in the s.u.v. and made my way back home with no problem. the next day when i went to back out of my drive way there was no reverse. i called a local gm dealership and was told that the problem appears to the sunshell gear. according to multiple post online, seems to be a common failure among envoy's and trailblazer. i checked the fluid and it appears to be fine, not low, not burnt, and still red and clean.
01/03/20101040001
 It appears that the transmission/solenoid failed. the suv does not always go into gear. slips out of gear. after suv sits for a while it goes into gear only to resort back to afore mentioned problem. *tr
08/05/2009724561
 First problem occurred in 2008, driving to work in 2003 gmc envoy slt (original owner) heard clunking noise when downshifting. took car in to shop for repair (just over 50k miles so out of warranty). shop explained that the transmission needed to be replaced $4000 with one year warranty. since i was planning on driving cross country decided to do the repair. one year later, driving and trying to accelerate on a ramp to find suv stuck in second gear and wouldn't accelerate while rpm kept going up. also heard clunking when downshifting. pulled over and tried to get gears to shift by slowing down and speeding up (to get rpm to drop). drove car to dealer who stated i needed a new transmission (again). dealer removed transmission and found input bushing in pump bad. and reverse drum. and had heavy metal contamination. when asked why this is my third transmission in six years the service agent said bad luck. both replacement transmissions were rebuilds. the current transmission is not under warranty. *tr
07/30/2009807001
 I have a 2003 gmc envoy, 80,700 miles original owner. while merging onto highway transmission locked in 2nd gear. engine rpm's increased to 5,000 speed dropped to 20 mph creating a dangerous situation with oncoming traffic. this happened without warning or any indication of a problem. i had vehicle towed to gmc dealer, asked if there were any known problems with gmc envoy transmissions and was told there were none. the diagnosis, my transmission exploded internally with a failure of the sun shell gear and torque converter. transmission could not be rebuilt and the cost of installing a re manufactured transmission was $3700! gm has been having these transmission failures since 2002 with no acknowledgment of liability! *tr
03/07/200859000103/01/2003
 Tl*the contact owns a 2003 gmc envoy. the contact smelled gasoline, but did not pay it any attention initially. his son entered the vehicle later and also smelled the strong odor. the following day the contact filled up the tank with gasoline and the smell intensified. when he arrived home, he noticed a fuel leak by the rear driver side wheel. a mechanic stated that the leak originated from the top of the fuel tank where the fuel pump connects. the contact dropped the vehicle off at the dealer the next day and they stated that the leak originated from the gas tank, and it needed to be completely replaced. the vehicle is still at the dealer. the current and failure mileages were 59,000. updated 04/16/08. *lj the transmission was slipping and would not engage in 1st gear. the air condtion was blowing hot air. the ignition swithc shorted out.
01/01/2003712/28/2002
 2003 gmc envoy with a list of problems **nar**cc the consumer began to hear a knocking and pinging in the engine on cold starts and felt a hesitation when the automatic transmission shifted into gear. after many complaints, it was finally discovered the engine knock was due to shorter pistons in the re-designed engine and the hesitation in the transmission shifting required reprogramming. the consumer was told he would have to live with the engine knock, because it could be more trouble taking the engine apart. on a separate occasion, the engine stalled due to the battery dying. from april 2004 to october 2004 the battery failed several times and had to be re-charged. during that same time the engine light illuminated and each time it happened, the dealer would have to reprogram the engine computer. the radio was not functioning properly which primarily consisted of static. the driver information center control knobs as well as the radio knobs wore out. the front center console was loose. it was discovered that the engine light was coming on because the third stop light that's on the top of the liftgate malfunctioned. there was a short circuit in the stop light. the cooling fan broke, the brakes and the left front head lamp had to be replaced. the rear tail lights, directional and signal lights have been replaced several times. the lug nut broke while a replacement tire was being mounted on the vehicle. the front stabilizer linkage was replaced. the gas tank had to be replaced along with the fuel lines and a seal on the tank due to a leak. the seat belt was designed poorly and the belt cuts into the consumers neck. the drivers side door didn't close properly, the windshield wipers were replaced within the first 2 years. *jb
11/03/200682000112/01/2002
 The transmission failed in my 2003 gmc envoy with 82,000 miles. the problem appears to the sunshell gear which seems to be a common failure with this transmission. because the transmission was downshifting hard, i took the car to a gmc dealer less than 1000 miles ago to have the transmission looked at. i was told my the dealer that there was a problem but not to worry about it. now the transmission has no reverse and the repair estimate is $1,800. *jb
07/05/200646000105/08/2003
 Parked 2003 gmc envoy at work. left work, unable to start truck. starter did not engage. unable to move transmission from park to neutral with key in on position and foot on brake. truck is stuck in park. *jb
10/03/20048202305/15/2003
 1) sequence of events - nothing happens when we try to start. -battery voltage ok, auto-headlights on, bright - instrument panel completely dead -2 hours later, instrument on the miles per hour instrument is going wild, back and forth finally sets at zero, now engine will start. check engine light is on for the first time - radio looses preset station memory 2) it started about a week; we had problems starting the warm engine. 3) automatic climate control is working sort of, sometime not 4) the check oil came on, at that time there was plenty 5) the backup mirror option is always loosing the input 6) transmission problem light was on for a day some time ago while driving in sb and in 2 wd, called your service and was told to ignore the dealer replaced the ignition switch, a superficial fix as it turned out later when the ignition switch was replaced again. the cause of the problem was not identified. *nm
08/01/20033
 Upon starting the vehicle and taking off the gear shifted, and then dropped down to the correct gear it should have be in. transmission was replaced within the first six months. also, starter made a clicking noise several times before starting. then the vehicle shut down. *ak
07/01/2004809/02/2003
 Problems with vehicle's windshield wipers.*mr the consumer noticed that everytime the windshield wipers were used, they would bounce across the windshield so much that the consumer was unable to see and in order for them to be used, the consumer had to keep turning them on and off to see properly. the vehicle was taken to the dealer at least four times to have the wipers adjusted and replaced. the last time however, it was determined that there was a bow in the windshield and it needed to be replaced. after having the windshield replaced, the consumer continued to experience problems. there was a film on the windshield and when the wipers were used, the consumer could not see properly. on two occasions the 4wd/a4wd light illuminated and the vehicle was stuck in 4wd and then all the lights went out and the transmission was slipping. the vehicle was taken to the dealer and the computer had to be reprogrammed. the consumer also stated the rear wipers failed and the dealer found a nut loose and the front washer hose did not work and there was a kink in it. there was noise coming from the windows, although the dealer said it was coming from the mirrors. *jb
04/03/2004116581
 Vehicle shifted gears without applying the brakes. *ak
106/12/2003
 When driving transmission kept slipping out of gear. dealer could not resolve the problem. *ak
10/08/20034800105/10/2003
 I own a gmc envoy xl. the transmission will not hold the car on an incline. in drive, the car will accelerate backwards down a hill. *la
POWER TRAIN - AXLE ASSEMBLY - AXLE SHAFT - SEAL
06/01/200675000311/01/2002
 Tl*the contact owns a 2003 gmc envoy. the contact stated that the rear passenger side door would not latch. the latches for both driver side doors were previously replaced. the manufacturer stated that the vin was not included in nhtsa campaign id number 05v494000 (latches/locks/linkages:doors:latch) for the envoy xl. the failure mileage was 75,000 and current mileage was 102,000. updated 01/11/08. *lj the front door latch are not starting to fail. the windshield wiper motor failed. the pinion seal was leaking and the taillight circuit board shorted out
POWER TRAIN - DRIVELINE - DIFFERENTIAL UNIT
01/15/20049985110/07/2003
 Steering failed when in 4 wheel hi also front wheels locked there was a rubbing noise under the vehicle. sounded like the transmission was falling apart. had this problem before and told by the dealer can't find anything wrong. had this vehicle only 4 months. major problems with 4 wheel drive. *cb
06/05/20031263105/05/2003
 When my vehicle had less than 200 miles on it the check four wheel drive light came on. whe had only had the car for less than a week. i asked the dealer and they said that as long as it was running fine the would put it on the computer at my 3,000 mile checkup. a few weeks later i started hearing a rubbing noise. i brought it in and they took it for a test drive. they told me that they had swiched it from 2 wd to 4wd high and the noise was gone. it was not. the next day i switched it into awd and there was no noise. that afternoon the front wheels locked up on me when i was going about 30 mph. we had the vehicle towed back to the dealership. they told us that the front differental was litteraly falling apart and have now said they are going to replace the transfer case. the milage on our envoy is 1263. needless to say, i am not happy. i purchased a new vehicle so i would not have problems. i have only had it for a month. *ak
POWER TRAIN - DRIVELINE - DRIVESHAFT
07/10/20032000305/31/2003
 I purchased my 2003 envoy in may 2003. soon afterwards i started getting a feedback through the gas pedial. it was kind of like a vibratipon. they said it was the drive shaft so they replaced it. that didn't help. each time i take it in they say it something different, but the problem still has not been resolved. it has been worked on three times for this and i am planning on taking it back in again. *ak
POWER TRAIN - TRANSFER CASE (4-WHEEL DRIVE)
12/24/2005205/13/2005
 I was making a slow left hand turn from a stop sign and my 2003 gmc envoy drive train had locked up causing the vehicle to come to a dead stop in the middle of the road. when this occurred i noticed the lights flashing for the 4wd and 4lo switch even though the switch had not been touched. the vehicle corrected itself and 15 sec later as i was making a left turn into my driveway the vehicle drive train locked up once again. to remedy this i put the car in park and there was a loud clunk and the lights went out and operation went back to normal. *nm
12/16/2004100001007/10/2003
 The consumer experienced a problem with the four wheel drive. the owner says that the light for servicing comes on and the vehicle has been to the dealer for servicing on 9 occasions in the last 18 months. the dealership doesn't seem to know what the problem is all about. *jb the diagnosis are as followed: on three occasions no problem was found, there were three transfer case repairs, there was a faulty ignition switch found related, wiring had to be replaced and a vdb was installed. *sc
02/29/2004574505/15/2003
 4-wheel drive light, my 2003 $35,000 envoy's service 4-wheel drive light came on the first time at 574 miles. the second time at 4,242 miles. the third time at 6,490 miles. the fourth time at 9,387 miles. it was then towed in for a fifth time just after that for several other problems. it went through three ignition switches in one week. it has had the transfer case modules, actuators, front hubs and more done. it has been reprogramed each time as well. i have only owned the vehicle for 9 months. i contacted gm about this and was told about a repurchase then told no. i hate my envoy and i will never purchase another gm product!!!!!!! everyone that asks me about it i tell them my story so i hope it gets around how bad this is and how bad this sucks! my dealership has been helpful but the reps from gm suck! i was never given a reason as to why the gm rep (moiz ahmad) said no and i was told that he not only doesn't have to give a reason that he doesn't have to call me when i asked for him to. and... they will not give me any information to even contact this guy. they don't have to. then when i complained that this was unexceptable and asked to speak with a supervisor the supervisor hung up on me!!! i was not very suprised to see that i am not the only one with this problem. i looked up the service bulletins and recalls (at alldata.com) and there were several bulletins on this. gm needs to get the envoys act together!!!! i am going through ny state lemon law now. wish me luck! *ak
12/17/2003130001
 While driving the 4 wheel drive automatically engaged. the consumer tried to manually disengage it several times. the dealership was notified, but has been unable to resolve the problem. please provide any additional information. *nm
12/11/20031877110/30/2003
 When vehicle started up, 4-wheel drive light came on. diagnosed as no codes stored in atcm. old atcm programming scanned for codes no codes stored. reflashed atcm with new update. *ak
11/22/200318000611/29/2002
 When the light went out on the 4-wheel drive, the consumer had to the shut vehicle off and restart the 4-wheel drive.*ak during snow conditions, the owner found out the vehicle would not shift to 4 wheel drive when the indicator light was on. in order to restore 4 wheel drive the vehicle must be shut down and started again until it lights up . the vehicle has been worked on three times with no repair orders provided. *cb *jb
11/09/2003108/17/2003
 While driving down freeway my check 4wd light came on. so now it is in the dealership for 2 days, with only 1600 miles on the vehicle... no 4 wheel drive ever used yet...it not going the way i expected for the price of this vehicle. *ak
3001
 The 4-wheel drive intermittently malfunctioned. dealer indicated to the consumer that the manufacturer was aware of the problem, but had no remedy. *ak
07/04/200305/15/2003
 My husband and i purchased a 2030 envoy slt in may 2003. the 4 wheel service light has come on twice. the first time, it was repaired. the 2nd time it came on, we were told we have no 4 wheel drive. we have been in contact with gmc customer service dept (1-866-996-9463, our representative is brandy johnson and our ref $ is 1-127444813). the resolution; we need to wait until the service 4 wheel drive light comes on again so we can take it into the dealer (if they are open) so a code can be read. i feel with winter coming, this issue has now turned into a safety issue as we will use this vehicle daily to take our son to daycare and go to work. i would appreciate any input you could assist me with as i strongly feel this vehicle should be replaced.
06/28/20031
 With about 1100 miles on my brand new car , the 4wd light came on. not happy about this purchase. *ak
06/05/20031263105/05/2003
 When my vehicle had less than 200 miles on it the check four wheel drive light came on. whe had only had the car for less than a week. i asked the dealer and they said that as long as it was running fine the would put it on the computer at my 3,000 mile checkup. a few weeks later i started hearing a rubbing noise. i brought it in and they took it for a test drive. they told me that they had swiched it from 2 wd to 4wd high and the noise was gone. it was not. the next day i switched it into awd and there was no noise. that afternoon the front wheels locked up on me when i was going about 30 mph. we had the vehicle towed back to the dealership. they told us that the front differental was litteraly falling apart and have now said they are going to replace the transfer case. the milage on our envoy is 1263. needless to say, i am not happy. i purchased a new vehicle so i would not have problems. i have only had it for a month. *ak