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Chevy TrailBlazer Transmission Problems



  • :) :) :) :) Took the 02 Trailblazer to Cottman transmission Center today.They are the BEST! They changed 2 cellanoids in the trany and a loose prong on the fuse wasn't connecting and Bingo, everything works great.The cruise works and it shifts normal again.If you live in Kenosha WI and have transmission problems,This is the place to go! We got our truck back the same day too.Thanks Scott! :) :) :)
  • steverstever Posts: 52,572
    Always to hear of a good mechanic!

    Please click on the Local Services tab above, select repair shops and the zip and see if they are on the list. If so, please post a review. If they aren't on the list, maybe you can email them the link so they can add their shop.
  • dws2kdws2k Posts: 12
    I've had problems with my 2003 trailblazer. I would take off in drive and trans would be in low gear. When the snow was here, my wife drove it and put it in 4 wheel drive and it sounded like a rattle while driving. Come to find out the drive axle is busted.
  • steve4979steve4979 Posts: 6
    2005 Trailblazer LT, 4WD, 63,000 miles.

    Transmission failed on Sunday while in cruise control. We were stuck 4 hours from home and had to spend the night. Towed to a dealership and it wil cost $6400 for a new transmission. Can believe a transmission failed with so few miles on it.
  • steve4979steve4979 Posts: 6
    Correction, it cost $3300 for a new transmission. Plus hotel and car rental costs and missed work.

    GM "customer service" in the Phillipines told me they could do nothing for me. A transmission with 63,000 miles on it essentially disintegrated! This is a catastrophic failure of a major drive train component and GM won't help to mitigate the problem because it is out of warranty.
  • I have problem with my 06 trailblazer going in Drive. I have to start the car off in 1 and work my way up to 3, like a stick shift. I took the car to the dealer and they told me that it was my park neutral switch and they wanted to charge me 300 hundred dollars to fix it. I fix it my self for 50.00,but I'm still having the same problem. I took it to a transmission shop and told they me I needed a transmission. I've driven the car about 3000 miles since this problem occurred. Any Suggestionssssssssssss.
  • mghunt73mghunt73 Posts: 2
    I've got a 2002 Trailblazer 2WD with 172,000 miles. A couple of weeks ago, while driving through some hilly country (north central Arkansas, US 412...if anyone's familiar) and noticed my tranny was actin funny. While driving at 45-55 mph in cruise and as i would climb a hill, the tranny would act like it was wanting to shift out of overdrive. It would increase by 400 rpms then lug back down 400-500 rpms. Then, it would completely skip shifting out of overdrive and downshift completely. So I took it out of cruise, and it would do the same as I slightly pressed the gas for more power to ascend the hills and it would do the same thing. I'd give it more gas and it again skip shiftin out of overdrive and downshift completely. I pulled over to check fluids, everything was good. No leaks, no smells, nothin loose. Stayed put for an hour to let it cool down but it still had the same problem once I got started back. I changed spark plugs and flushed tranny and put on a new tranny filter at 150,000 miles. Also had injectors cleaned at 150,000. Anybody have a clue what's goin on? Transmission doesn't slip, power is getting to the wheels just fine.

    Also, ever since I got it with 95,000 miles on it there's been a hesitation in accelerating from dead stop or <5mph and a somewhat rough idle where it seems like something would drag the engine down. It felt like a hesitation in power getting from the engine to the tranny when accelerating. Problem hasn't gotten worse or better since. Dealership said it was a dirty throttle body, so I had em clean it since I bought an extended warranty on it and it didn't cost a thing. But it didn't fix the problem. And it's not throwing any codes for any of the problems listed above. Anybody got suggestions/fixes?
  • jimb68jimb68 Posts: 2
    edited June 2010
    Replaced the fan clutch and temp coolant sensor in my 03 trailblazer. Took it to the chev dealer and had the updates done still roars when I first leave a light. Makes a ticking noise with ac on. Now I am told it is the compressor failing yet it roars with the ac off. Any thoughts sugg. Ty Jim B Also replaced the fan relay
  • brettd1brettd1 Posts: 3
    Im a mechanic at chevy dealership Ive worked on your problem more than once even on my own trailblazer. Under the hood in the fuse relay box (its the bigger box) on the drivers side open it up directly look down there should be two large fuses side by side remove them and switch them out run the vehicle from a dead stop at a street light whereever youve heard the grinding roar,see if that helps if not go to your dealer parts take both fuses in and get new ones these are the relay fuses for the fan clutch and a/c.defrosters dont let them fool you into thinking its not them Ive replaced about 60 in the past 3 years it worked on mine by just switching them out ..If youve ever had a dead battery or had the car jumped it is just murder on those fuses..hope this helps some.later,Brett.
  • jimb68jimb68 Posts: 2
    the relays are number 45 and 46 in my owners manual. 45 controls the cooling fan 46 is the headlamp driver module. These are $45.00 apiece at the local chev dealer! Swapped them with no difference. Are you pretty positive of your idea? I cannot return these relays. Ty Jim B
  • Do you have any suggestions on tranny problem post #450
  • mghunt73mghunt73 Posts: 2
    Thanks brettd7. I'm gonna try your suggestion tonight when I get off work.
  • I bought my wife this 2005 TB thinking I was doing a good thing. I have always been a Chevy guy and have had pretty good luck up to this point. First at 40,000 miles the water pump went out. The dealership wanted $1500 to replace it. We have 75,000 miles now and both front wheel bearing hubs went bad and the tranny in whinning like crazy. I replaced the waterpump and both front wheelbearing hubs myself but I am not a tranny guy. Has anyone had issues with a 2005 TB tranny?
  • More to my story!
    So, May 2009, new water pump (which is another GM continuous problem), serpentine belt, radiator and transmission flush costing me $869. Scroll forward to Aug 2009, new $4000 transmission in my Trailblazer at 67000 miles. Scroll forward to May 2010. 2nd transmission fails 600 miles from home at 79000 miles. Transmission was covered by warranty. But seems that someone clamped the lines that went from the radiator to the trans cooler thus making my 2nd transmission overheat. Now the transcooler ran dry and needs to be replaced. Another $500. Within 15 months, I am now out $5400 not to mention the cost of hotels, rental car, etc. I am so fed up! I am taking action to get some of my money back being as a lot of this is GM's failure to support its customers by producing a quality product. Seems they took short cuts with inferior parts that they knew would only hold up for so long. Then we'd take it to a GM dealer for repair. BY THE WAY, I was told by a GM dealership that we shouldn't be flushing the transmission. Anyone hear of this?
  • Because of ongoing transmission issues on my 2004 Trailblazer (and many of you here know what I mean), I went to a GM dealership for a 2nd opinion. I had my transmission flushed a year ago. The service manager told me that they don't do transmission flushes on some vehicles because it takes the internal transmission parts down to the bare metal? I kind of understand, but has anyone heard of this? Ever since then, I've had a new trans installed at 67000 and it blew at 79000 miles because it overheated. No coolant in the trans cooler because someone clamped off the line from the radiator to the trans cooler. Thus, the 2nd trans overheated...uuuggggggghhhhhhh...... ANYWAY, anyone hear about not flushing transmissions?
  • burdawgburdawg Posts: 1,524
    edited July 2010
    Yes, I have. I don't do it myself, fluid & filter changes at 50K intervals is all I do. If you found the trans cooler line or lines clamped off, then it sounds like the second transmission failed due to someone leaving the clamps on the lines during some other service, probably the 1st transmission change.
    The transmission in the standard TB is basically a TH700R4 that goes way back to 1985(?).
  • burdawgburdawg Posts: 1,524
    Also, why would the trans cooler need to be replaced just because it was run dry? It's just a cooling coil inside the radiator..........
    Your probably going to spend more trying to get money out of GM than you have in repair costs.....
  • Hi,
    I have a 06 TB, bought it with 40,000 on it. Have had nothing but problems with it. In 1-10 a month after buying it the water pump went out. The a pully broke, at 90,000 my wheel bearing hubs have went bad and my transmission started slipping. A month later it went out. I didn't know all the bad things about trailblazers until I bought one. Still owe $10,000 on it and want to get rid of it asap.
  • showerqueenshowerqueen Posts: 2
    edited August 2010
    I bought an 03 TB in Jan of 08 with just over 100,000 miles on it. In Oct of 08 at 112,000 miles the tranny went out. Had it replaced at a reputable shop. In Aug of 09, it went out again, replaced at same shop. Went out in March of 2010, replaced at same shop. It has gone out again, 30,000 miles after the 1st time and 7000 miles after the last. My question is when does it stop being the truck and start being the shop?? Last time they 'only' charged us $750 to fix it. This time I am demanding it be done for free. But is it their problem or is it the truck? We do not abuse it, only use the 4wd 3-4 times a year, we do tow a boat occasionally with about 2500lb tongue weight (it should be able to handle that-it's rated for 5000lb) and for about 10 miles round trip. What other issues could be causing the transmission to go out so frequently? I drive 60 miles round trip to and from work, mostly highway, use the cruise control most of the time, do not accelerate quickly or stop suddenly. Have not had any other problems with the truck at all.
  • hammakerhammaker Posts: 1
    edited August 2010
    I have a 2004 Trailblazer, I revved the motor high and dropped it into drive, and lost my reverse gear, also neutral is now drive, still works in 2nd, 3rd, and overdrive, but when in park only revs to 35 rpms. This has happened to me a couple of times was able to fix by disconnecting the battery, will not work this time around. Other than not having reverse gear drives fine. Any suggestions?
  • My wife bought an 04 TB new, it now has 98K miles and we have had very little problems with it. Last night we pulled out of a driveway and the engine over reved. I tried shifting but it wouldn't work. I was able to drop it into 1st and then into 2nd, but Drive and 3rd are gone. A former Chevy Service rep said with that many miles just replace the tran. Most tran problems I've had in the past come on over time, I've never had one happen this sudden. Any suggestions?
  • I came to work and tried to put my car in park; car wouldn't go in park, but I did get gear shift to go into 1 but now can't get it in any gear; it is almost like it is "not catching" something; can't turn car back on because can't put car in park to turn ignition!
  • I have never had a transflush on my 2005 Trailblazer and it has 128.000 miles on it, is it safe to do now?
  • burdawgburdawg Posts: 1,524
    I wouldn't flush it, only drain & remove the pan, change the filter and refill it.
  • One of the problems with the TB transmission, especially when it comes to not changing gears, is that the shift solenoids go bad. I bet most of the problems people have with TB transmissions is the shift solenoids. They cost around $25 and are easy to replace...but a little messy. All you have to do is take off the transmission drain pan cover (around 18 bolts) and drain the tranny. Make sure you have a new pan gasket and you might want a new transmission filter. You can get a gasket and filter (one kit) at Autozone for around $30. There is a shift solenoid for each change of gears, 1-2, 2-3, etc. My 2-3 went out, so I just replaced them all. Before a transmission repair shop tells you you need a new tranny, I would go to Autozone and get a free Check Engine Light diagnostics. I've read so many similar problems with the transmission, where people are going and having the entire transmission replaced for more than a $1000 dollars, when all they might need is a new shift solenoid for around a $150 repair if you don't do it yourself. Hope this helps.
  • About 2 weeks ago, my 2004 TB ( 4 wheel drive -75,000 miles) began to stay in low gear. Rpm's quite high before switching to the next gear. Not knowing much about transmissions, I figured I had better check the fluid. The dip stick was corroded off. There was no dip stick. Now what?
  • I have an 04 tb ext. About two weeks ago i got my oil changed, fluids topped off, tires rotated due to me going on a road trip. This past weekend I drove down to Dallas, TX. AS SOON as i hit dallas my service engine soon light came on. I wasnt at my destination yet maybe just 10 mins out, but the car was still running fine. After i got to the hotel I did not drive the car until about 3 hours later which is when the tranny would slip i guess and would not go above 30mph. The nxt day i took it to the closest autozone for the engine diagnostics and the code was something like P0894 transmission slipping; possible causes included low fluid level, contaminated fluid, failed TCC solenoid and poor electrical or whatever. I added transmission fluid to it. The guy said it takes 11 qts but i only put in 3 just to make it back to the hotel. I did not drive it for the rest of the day and the next day with still no intentions of driving it, i noticed that basically all the fluid i had put in it was on the ground. Not being from Dallas i looked online for local repair shops. I found one and based on the great reviews I called them told them my problem and had it towed to the shop the following day. Basically once there they put it on the computer and it stated transmission slipping. They changed the gaskets, fluid, seals etc and let it sit for a few hours. The leak had stopped so they attempted to drive it and it would do the same thing at about 40 mph. After that, the repair guy basically jumped into I need a new transmission. $2800 tranny w 1 yr warranty or $1800 with no warranty. Then he calls back and is like i can get one for $1550 w/ 1 yr warranty. With him jumping around on prices like that it then made me iffy on what he was telling me. Should i get more opinions? Bc reading comment #469 it could just be the solenoids. Any feedback would be great seeing how i dont have the money for a transmission

    Not to mention im back in my home state while the car is still in Dallas smh
  • I stopped at a supposedly reputable transmission shop. he told me that slipping is a result of low fluids and it would not be my problem ( #470). I don't have any leakage. I thought that possibly I was low since I could not easily get into 2nd gear from the low gear. He said most likely my problem is the solenoid. The trans switches gears electronically. Also I just stuck a BBQ skewer down the tube where you check the trans fluid level and it is crusted up about 8" down. I did not poke any further. ??
  • I have a '04 TB, recently my service engine light came on. When I took it to a mechanic he found that one of the cylinders was very low on pressure. He stated that he had never seen this before and that the only way to fix this was to put in a new engine/rebuilt. If not, then he recommended I trade the vehicle in as soon as possible. I am disappointed, aside from this issue the vehicle is in excellent condition. Is there anything that can be done besides the two options I was given? I can't afford a new car nor the cost of replacing an engine. Someone please help!!!!!!!
  • burdawgburdawg Posts: 1,524
    I would get another opinion. There's other reasons a cylinder can be low on pressure than just "needing a new engine". A spark plug could be loose, you could have a burnt or damaged valve, etc. I'm not saying that the end result will be different, but the root problem should be determined first.
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