TRANSMISSION SHIFTING

  • Tiny
  • robwhite
  • 2006 Hummer H3
  • 5 CYL
  • 4WD
  • 98 miles

I have a 2006 Hummer H3. Last week the transmission started shifting only at high rpms 3000 plus. Transmission fluid has been changed every 30k, currently has 98000 on it.

Saturday, March 26th, 2011 AT 4:48 PM

4 Answers

  • Tiny
  • factoryjack
  • Expert
  • 4,263 posts

Is the check engine light on, does it complete shifting through all four gears, and is the shifting more soft/harsh then normal?

Was this
answer
helpful?
Yes
No
Saturday, March 26th, 2011 AT 5:46 PM
  • Tiny
  • robwhite
  • Member

No check engine light on. Sometimes it will shift to 4th but not all the time, depends on speeed and rpm. The shifting sounds normal.

Was this
answer
helpful?
Yes
No
Saturday, March 26th, 2011 AT 6:57 PM
  • Tiny
  • factoryjack
  • Expert
  • 4,263 posts

Check and clean the mass air flow sensor hot wires, especially if it has an aftermarket oiled air filter(e.G. K&N). If it were possible, I would recommend checking and clearing the shift adapts, that would require a scan tool. I will include a general diagnostic chart for inaccurate shift points.

Was this
answer
helpful?
Yes
No
Sunday, March 27th, 2011 AT 3:53 PM
  • Tiny
  • factoryjack
  • Expert
  • 4,263 posts

The chart I mentioned.

Was this
answer
helpful?
Yes
No
Sunday, March 27th, 2011 AT 3:54 PM

Please login or register to post a reply.

Similar Questions