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Trailblazer Trans Problems

Discussion in 'GM Powertrain' started by The Blaze, Aug 16, 2007.

  1. The Blaze

    The Blaze New Member

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    Hello out there. I have an '04 4X2 Trailblazer with 51K. I don't have 3rd or 4th gear. No service light. Worked fine. Got in it again and NO 3rd or 4th. Took it to a trans guy who put a scanner on it. He showed me that the A and B solenoids were going off and on when there supposed to. The computer said it shifted but actually the mechanical part did not.He told me that the 3rd gear clutch band was gone! No codes were found. Now is this true or not? Any advise or deaming that this is true would be appreciated.
    Thanks.:gasp:
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  2. ChevyFan

    ChevyFan Administrator Staff Member

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    Well, not having codes is pretty weird. There were a couple of TSBs that I found for the 2004 Trailblazer

    TSB #010730038B
    THE 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. *TT (NHTSA ID #10005162, OCTOBER 01 2005)

    TSB #00702
    SLIP CONDITION IN 2ND, 3RD OR 4TH DAMAGED 2-4 BAND 3-4 CLUTCH ON THE 4L60E/4L65E AUTOMATIC TRANSMISSION. *TT *MJ (NHTSA ID #10005476, JANUARY 01 2004)
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  3. The Blaze

    The Blaze New Member

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    Trans

    I was told that since NO service light that it was mechanical and not electrical.
    does this sound right?:gasp:
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  4. racer14

    racer14 New Member

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    Actually, that's true. If all the electrically controlled devices work, i.e. solenoids, relays, then another sensor will have to report trouble to the computer. If the computer sees an unusually high input speed to the transmission compared to the output speed, it should set a code for trans speed discrepancy. If the computer thinks the truck is in OD, for example, and the engine speed is 4000 rpm @ 60 mph because the trans didn't shift as it was told to, a code should set. I'll have to research to find the specific code or codes, or any GM tech may be able to tell you.
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  5. The Blaze

    The Blaze New Member

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    Still trans problems-NO 3RD or 4TH

    Is anyone able to answer or have any idea on my Aug 16th thread? No 3rd or 4th gear. Solenoids are working ( per scanner). No "service engine" light. I took the battery cable OFF before taking it to the trans shop. No codes pop up. No light before taking cable off either.
    A few days earlier rpms jumped to 3k then shifted to 3rd & 4th. Ran fine for a couple of days. Took it out and on the way home it just didn't shift to 3rd at all.
    Any answers??????
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  6. MrShorty

    MrShorty Moderator

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    So, the computer is commanding the shift, but the transmission isn't responding, nor setting a code???? Or did your scanner simply verify that the solenoids could respond??

    I must have missed the previous thread, but what year/transmission are we talking about?

    I'm no expert on these computer controlled transmissions, but, if the computer can command the shift, and the transmission doesn't respond, then that suggests something has gone bad inside the transmission.

    My understanding is that a lot of these computerized transmissions default to 2nd gear as the "limp" mode. Is that what it's doing?

    Has anyone dropped the pan to check the condition of the fluid and check for "debris?"

    For that matter, have you checked fluid level?
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  7. unplugged

    unplugged New Member

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    I agree, it sounds like your transmission is in 'limp' mode. I would stop driving it, and get it into the tranny shop asap. It sounds like your transmission mechanic is doing right by you. If you don't trust him, ask your friends who they take their tranny work to. If you are on a tight budget you could go the junkyard swap route, but if you haven't swapped a trans out before it might be more than you want to take on.
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  8. Crawdaddy

    Crawdaddy Moderator

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    yeah, it definitley sound like a mechanical problem in the tranny, most probably the 3rd band went out like your mechanic said. If the RPMs don't drop into the right spots when if shifts, it won't go into 4th either b/c the revs aren't right to go into that gear. Get the tranny in ASAP to be rebuilt. I hate computer controlled trannies in a way, but they're nice at the same time, except when they don't/can't report problems like this...
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  9. The Blaze

    The Blaze New Member

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    solenoids?

    The man's computer "said" the solenoids turned off and on when they're suppose to. We drove around with his pc plugged in. I watch the solenoids turn off and on. It also showed the tranny shifting to 3rd and 4th. The truck DOES have 1st and 2nd and reverse. If it is the bands, would they go out just like that?
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  10. TrailLeadr

    TrailLeadr New Member

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    You're going to have to forgive me here, since I haven't worked on one your kind of transmission before. So we're talking about 4th being OD, is that correct? This is not a five speed automatic, right?

    If that is the case then it is very possible for the friction plates to have worn down for third gear. The vehicle is never going to hit fourth since that is a locking of the torque converter, and it needs to achieve a specific output RPM before it even considers locking up.
    The only way I can see short of a defective transmission, for 3rd to go out, is if this vehicle is a highway, or cruising vehicle, and saw a lot of frequent harsh down shifts at highway speeds. I mean "a lot". It's more typical for the plates in 2nd to go, as they typically are used for reverse as well, in most transmissions.

    The other option is that the valve body has gone bad, and needs a rebuild.

    Well, no matter what you're likely looking at a rebuild. As was suggested before you could go the junk yard route, but that's a lot like playing the lottery, and I have to admit, I never liked those odds. You never really know what you're getting.

    Pull your dipstick, and give if a sniff, if it smells like almonds then you have some burnt friction plates. If that yields no help drop the pan, and search for metal flakes. Dark matter in the bottom of the pan is to be expected to a degree, as is a small amount of metal filings that will collect on the pan magnet. Over abundance of these could indicate worn plates, and steels.

    Your problem most definitely sounds mechanical.

    Good luck, and keep us posted:great:
    Chevy truck parts www.gmpartsclub.com
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  11. racer14

    racer14 New Member

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    The 4L60E and 4L80E transmissions are true 4-spd. transmissions with the added feature of a locking torque converter. If the command to shift is shown on the scanner as a shift, and the trans doesn't shift, the trans is done. Go rebuilt only.
    #11
  12. The Blaze

    The Blaze New Member

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    Trans fixed

    :sign0016:Hey Guys,
    Chevy dealer said that this problem was an internal problem. It was nothing that I could prevent. It was a part that was defective inside. The dealers have a bulletin on this problem!!!!! We called GM and without admitting GUILT they offered to PAY to have it fixed MINUS $500. We got it back today. They said to keep receipt so if it happened again that the other dealer would know to fix it. So pass this on to anyone that it may help.:great:
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  13. ChevyFan

    ChevyFan Administrator Staff Member

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    Amen! Thanks to the GM guys for doing right by you.

    What's your year/make/model again? What was the TSB that they pulled? How many miles, just for record.
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  14. Toymyster

    Toymyster New Member

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    Steve brought up a great point!! When the problem is taken care of, please post the fix. This will add to the database and makes it easier for the next guy!!
    Blaze, I'm glad they took care of the problem, and thank you for posting the fix!!:great:
    #14
  15. jk5blazer

    jk5blazer New Member

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    My wife has an 04' 2x4 and we had the trans rebuilt. Lucky for us it was still under because the trans dip stick was getting water poored into it from the wipers area. Forgive my ignorince for not knowing the proper term. But if it would rain and she took a turn to the left water would just poor into the dip stick. My dealer said it was a recall and GM would pay for the fix. Not sure if this could be your prob but something to look into! Just my two cents

    Josh
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  16. The Blaze

    The Blaze New Member

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    Info update

    :sign0016: My truck is an '04 Chevy Trailblazer LS. I was not told of the bulletin memo #. jk5blazer made an interesting statement. I checked the trans fluid when the truck broke down. The trans dip stick had "rusted off" the handle. I was afraid to put it back in in fear of losing it down the tube. I checked after the fix and another was replaced. I can try to see if dealer will give me the bulletin #.

    I do have another question. Does anyone know if an LS is prewired for fog lights and compass mirror?:rules:
    #16
  17. joker23

    joker23 New Member

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    This issue happened to me yesterday. I have an '01 2X4 Suburban with 76K miles. I drive it hard, and I tend to do a lot of passing at highway speeds with hard downshifts, so I'm sure it's from abuse. I also had to have my u-joints done last month after parking on a very steep incline with no e-brake (although they were pretty worn before that).

    Anyone have any idea what a rebuild will cost and whether it would be better to get it done at the dealer or a trans shop?
    #17
  18. joker23

    joker23 New Member

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    Rebuilt trans cost me 1800. Was informed by the shop owner that this is a very common issue with '97 to '03 GM 4L60E transmissions...the sun gear shell (?) either cracks or breaks into multiple pieces. Replacing it requires a complete rebuild and GM has no plans for a recall. Supposedly it was replaced with a better quality product after '03.

    Here is just one of the many write-ups I've seen on this particular topic.

    http://www.automotiveforums.com/vbulletin/t208603.html
    #18

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