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Won't shift when cold out.

Discussion in 'GM Powertrain' started by Reviction, Dec 22, 2009.

  1. Reviction

    Reviction New Member

    Hi all,

    Now that it's gotten colder outside, my 2000 Silverado has been shifting differently. Up until now, it always shifted at normal RPMs. Now, it shifts at a normal RPM from 1-2, but it will hold 2 and 3 up to a much higher than normal RPM before shifting.

    In the morning, I start out on a 25mph road and it will stay in 2nd gear up to 30mph (2500-3000rpm I think) and never shift. Even when I let off of the gas when I get up to a red light, it will stay in 2nd and actually engine brake like a manual.

    It only does this when it is below about 20 degrees out. When I leave work, it shifts normally as it usually warmer outside by then. And if I hit a warm morning it will be fine also. It's got a 5.3 with the AutoTrak 4wd if that matters. Anyone else experiencing this? Of do I have a problem?
  2. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    That's probably normal operation but to be on the safe side get your PCM scanned for trouble codes
  3. Project Reaper

    Project Reaper Rockstar 100 Posts

    yeah it will rev at higher rpm to keep the fluids warm and flowing smoothly. unless you get a engine light or anything like that i wouldnt worry. 20 degrees out is freaking cold. im in souther cali and originally from florida so i never encountered anything like that.

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