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.

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

4 Replies

Tiny
FACTORYJACK
  • EXPERT
  • 4,259 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

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
  • EXPERT
  • 4,259 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
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The chart I mentioned.

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Sunday, March 27th, 2011 AT 3:54 PM

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