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05-13-2009, 10:15 PM
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Hummer Guru
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Join Date: Nov 2002
Location: Brooklyn,NY,USA
Posts: 2,331
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Knock Sensor question
Does anyone know where the knock sensor on a 2003 H2 is located?
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05-13-2009, 11:44 PM
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Hummer Authority
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Join Date: Oct 2003
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Re: Knock Sensor question
Not going to like this, they are under the intake 
Last edited by Easy Ed : 01-27-2021 at 03:01 AM.
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05-14-2009, 12:20 AM
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Hummer Professional
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Location: NY
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Re: Knock Sensor question
That location does suck. I had mine replaced by the dealer after my first offroad trip......lol.
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07 H2 Lux, Volant CAI w/MAF and Hypertech PP III.
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05-14-2009, 05:15 PM
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Hummer Guru
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Re: Knock Sensor question
Thanks for the info.
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05-21-2009, 08:30 PM
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Hummer Guru
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Re: Knock Sensor question
Done. Thanks for the help!
Advice to others : If you have to do this change them both at the same time. Best 90$ you'll ever spend. 
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05-22-2009, 06:57 PM
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Hummer Authority
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Re: Knock Sensor question
Also if you do this repair, leave the foam at the back of the intake out so water has an escape route and put a bead of silicone around the rubber inserts at the sensor holes to keep water out. Biggest cause of failure is corrosion from water intrusion
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1998 Chev Z71
2007 Chev Trailblazer SS
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05-22-2009, 07:33 PM
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Hummer Guru
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Join Date: Nov 2002
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Re: Knock Sensor question
Yeah I seem to have a lot of that going on all over the place. 
No more water fording for me.
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