2004 Trailblazer LT; intermittent no reverse

Discussion in 'GM Powertrain' started by gordone, Oct 4, 2011.

  1. gordone

    gordone New Member

    2004 Chev Trailblazer LT, 140,000 miles.
    When shift into reverse it does not engage and it makes a loud grinding noise.
    After approx. one hour, symptom disappeared. Reverse ok. Then had transmission work done.
    5,000 miles later, symptom appeared again. After letting car sit for a couple of hours, symptom disappeared. Returned to Transmission shop. They test drove…worked fine. They dropped the pan, took a look at transmission again and said it was totally clean and no apparent problem that they could see.
    Approx 5,000 miles later, symptom appeared again. This time I drove on highway. While gliding down hill, if over 50mph, the similar grinding noise heard. When I gave it a small amount of gas, noise disappeared. I pulled over, on downhill grade, put it in park, and the car glided forward (park did not engage). I stepped on the brake and the car stopped and park engaged. Reverse was still not working. Park engaged ok after that.
    Drove 60 miles to destination. Parked, tested the reverse and all symptoms gone…engaged in reverse properly.
    Took to Transmission shop again. They test drove for long time…could not get symptoms to reappear. Transmission fluid ok. They baffelled and now recommend to have cable replaced that runs from shifter to transmission. …no promises.
    Are we missing something?
  2. ChevyFan

    ChevyFan The Sheriff Staff Member 5+ Years 1000 Posts

    No promises, but sounds electronic, like a bad actuator. Are you having electric issues a well? Battery charging problems?

    ---------- Post added at 11:17 PM ---------- Previous post was at 11:08 PM ----------

    My trailblazer had shifting problems when the battery was just about dead once, and after I replaced it it missed second gear for an hour or two off and on. That's what I was basing that on.

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