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Transmission shifting

Tiny
ROBWHITE
  • MEMBER
  • 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 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Is the check engine light on, does it complete shifting through all four gears, and is the shifting more soft/harsh then normal?
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Saturday, March 26th, 2011 AT 5:46 PM
Tiny
ROBWHITE
  • MEMBER
  • 2 POSTS
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.
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Saturday, March 26th, 2011 AT 6:57 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 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.
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Sunday, March 27th, 2011 AT 3:53 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
The chart I mentioned.
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Sunday, March 27th, 2011 AT 3:54 PM

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