Question about Chevrolet TrailBlazer

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Transmission not downshift when

What would cause a 2003 trailblazer to stall out when breaking

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  • Tony Werner
    Tony Werner May 07, 2014

    engine runs fine and no codes or check engine lights

  • Jon Hufford May 08, 2014

    so is it only while in drive and you hit the brake or all the time when you hit the brake. So in drive, Park, Reverse if you hit the brake dos it die out?

  • Tony Werner
    Tony Werner May 08, 2014

    reverse is fine and it does it when its warmed up and not cold

  • Jon Hufford May 09, 2014

    Sounds funny, do the brakes maybe need bled. I ask because I read this

  • Jon Hufford May 09, 2014

    http://forums.trailvoy.com/archive/index...

  • Jon Hufford May 09, 2014

    they speak about brake booster, and throttle body maybe needing cleaned

  • Jon Hufford May 09, 2014

    The part you mentioned about it is fine when it is cold, but starts when the vehicle warms up. thats throwing me for a loop

  • Tony Werner
    Tony Werner May 09, 2014

    to me it feels like the transmission doesnt want to down shift right

  • Tony Werner
    Tony Werner May 10, 2014

    i got a code from the O2 sensor

  • Jon Hufford May 16, 2014

    O2 sensor is part of emissions control, of course should be replaced but unsure if will fix your problem

  • Jon Hufford May 16, 2014

    http://auto.howstuffworks.com/question25...

  • Jon Hufford May 16, 2014

    that is explanation of O2 sensor

  • Jon Hufford May 16, 2014

    does it run rough at all? if so coil packs, wires or plugs may need changed

  • Tony Werner
    Tony Werner May 17, 2014

    it runs fine other wise but it was taken to the garage and they found the o2 sensor was shorted out and 2 codes for it and changed it and ran it a few times and it didnt act up

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  • 15 Answers

Sounds like you throttle position sensor

Posted on May 06, 2014

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Posted on Jan 02, 2017

  • 13 Answers

SOURCE: Downshift problem at a stop?

does it do it at idle? if so... see if it has an idle air control valve if it does... replace

Posted on May 17, 2011

  • 38 Answers

SOURCE: honda civic 2003 transmission

Its possible that your transmissions Shift Solonoids could be acting erratically, either because they themselves are faulty, or the transmission's ECU is faulty, or maybe even the wiring between the two is somewhat faulty.

However it is also possible that your transmission's Speed Governor is holding too much pressure and doesn't realize it needs to downshift when you start slowing down.

Thirdly it is also possible that your Torque-Converter lockup may be siezed, or the wiring feeding it may be faulty.

Transmission repairs are usually somewhat pricey, and difficult to pinpoint, and fix, and I'm sorry to say that most of these causes to your problem really can't be checked without pulling the transmission out of the car, and disassembling it to see what the problem is.

Posted on May 16, 2008

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Its possible that your transmissions Shift Solonoids could be acting erratically, either because they themselves are faulty, or the transmission's ECU is faulty, or maybe even the wiring between the two is somewhat faulty.

However it is also possible that your transmission's Speed Governor is holding too much pressure and doesn't realize it needs to downshift when you start slowing down.

Thirdly it is also possible that your Torque-Converter lockup may be siezed, or the wiring feeding it may be faulty.

Transmission repairs are usually somewhat pricey, and difficult to pinpoint, and fix, and I'm sorry to say that most of these causes to your problem really can't be checked without pulling the transmission out of the car, and disassembling it to see what the problem is.

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