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2009 Chevy 3500 First Gear Slipping

Discussion in 'Truck & Equipment Repair' started by PGHplowguy, Oct 30, 2015.

  1. PGHplowguy

    PGHplowguy Senior Member
    Messages: 102

    Hey guys,

    I have a 2009 Chevy 3500 dump 4x4. Over time when put into drive and hitting the gas the RPM's go up but the truck does not accelerate. When letting go of the gas and waiting a second it then accelerates fine. All the gears also shift fine without any power lost. The truck only has 35xxx miles on it and has been well taken care of. So I wouldn't think the transmission even though the symptoms make sense.

    Somebody told me that it is the O2 (oxygen) sensor is bad. Salt could have clogged it up some. Does this make sense to you guys? Think replacing that will solve the problem?

    Thank you!
  2. kimber750

    kimber750 PlowSite Veteran
    Messages: 4,678

    Next time it does try actually shift into 1st. Sometime it can be just a harness issue or safety switch. Be best if you knew someone with a scanner that can read the tranny codes and info. Had an issue where safety switch was telling the tranny it was in drive when I had it in reverse. This tends to piss off these electronic transmissions.
  3. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    Trans. Get it looked at.
  4. leigh

    leigh 2000 Club Member
    from CT
    Messages: 2,342

    x2, not worth trying to figure it out.Had issues with my Allison and the experts figured it out and fixed it for 420$I thought speed sensor,nssw,harness,tcm,and more.Slipping, banging,I thought it was toast!