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  1. #1

    Default Transmission(not shifting)

    I have an 03 trailblazer and was driving this morning and all of a sudden the service engine light went on and it did not want to accelerate. Now in drive it has a hard time to begin to accelerate and will rev the RPM's up but will continue to go faster if needed it just won't shift. I can manually shift with 1,2,&3. The transmission fluid is fine. Could this mean my trans is going out or could it be a computer problem? How can I tell? All your advise would be great, I have 2 sets of twins and I cannot afford to go to the dealer. Help please.....

  2. #2


    Im not an expert but my mom had a tahoe that was doing kinda the same thing and her's ended up being the torque convertor
    03 silverado ls model x-cab z71 w/ 5.3l.
    black lo pro toolbox
    ruff country leveling kit
    285/70/17 tera tracs
    stock 17's that are rhino lined
    5% tint

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    I had the same thing for my thunderbird in college, it was the MAF, it was shot and was not giving the ECM the proper info so it wasnt letting the tranny shift as it was being told it wasnt meeting its settings for the needed shift points, but i think it could have just been a ford thing. But after a new MAF it ran like a charm.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    That would help me if I knew what the heck an MAF was>>>>>>>

  5. #5
    Jr. Apprentice
    Join Date
    May 2009
    Vancouver BC Canada


    MAG sensor is a Mas Airflow Sensor. it measures how much air goes in the intake. its right after the air filter.
    2000 Silverado Z71 4x4 fully loaded. 6L Swap, Fully built 4l60E Transmission w/ custom shift kit, intake, Edelbrock headers, custom 3" exhaust, MSD wires, 3" lift, 33" tires, Hypertec Programmer.

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