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#1
06-12-2011, 02:29 AM
Hummer Veteran
Join Date: Apr 2009
Posts: 28
Speedometer and Speed Sensore help needed!
The speedometer needle in my 2009 H3 is bouncing all over the place. I had this same thing happen in another vehicle I owned and ignored it as everything else was working properly. Eventually, the speedo needle became detached from the speedo and I had a real mess on my hands! The culprit turned out to be the speed sensor!
Well, deja vu!. Can someone please tell me where the speed sensor is for my H3? I want to get it replaced asap before my speedo breaks.
Thanks everyone!
#2
06-12-2011, 02:56 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Speedometer and Speed Sensore help needed!
Vehicle speed sensor is on the back right side of transfer case just ahead of the driveshaft output
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#3
06-12-2011, 02:58 AM
Hummer Veteran
Join Date: Apr 2009
Posts: 28
Re: Speedometer and Speed Sensore help needed!
Do I have to crawl underneath to reach it? Is it easy to get to? Do I have to remove the skid plate to access it? Is there a plug I have to disconnect? Thanks>
#4
06-12-2011, 02:59 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Speedometer and Speed Sensore help needed!
I would inspect wiring to the sensor thoroughly before replacing the sensor, more like to have a partial break in a wire than have the sensor go bad. Give the wires at the connector a firm pull and if they start to stretch you have an internal break in the wire. Check for chaffing in the harness as well.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#5
06-12-2011, 03:00 AM
Hummer Veteran
Join Date: Apr 2009
Posts: 28
Re: Speedometer and Speed Sensore help needed!
I am not real good at figuring this kind of stuff out. Can you please be a little more discriptive where the speed sensor is? I really appreciate it!
#6
06-12-2011, 03:00 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Speedometer and Speed Sensore help needed!
Yes you need to get under it, there is a connector right on the sensor. shouldnt have to remove any skidplates, been awhile since ive seen one personally going by memory
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#7
06-12-2011, 03:03 AM
Hummer Authority
Join Date: Sep 2003
Location: Canada
Posts: 1,251
Re: Speedometer and Speed Sensore help needed!
Round sensor on the tailshaft of the transfer case with a 2 wire connector. right side facing about 15 deg down towards the ground
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
#8
06-12-2011, 09:04 PM
Hummer Guru
Join Date: Dec 2006
Posts: 2,195
Re: Speedometer and Speed Sensore help needed!
not sure if this is related to the issue your having but when i had my "07 H3 at one point the speedometer, and tachometer. stopped working. no matter what happened both would read "zero" always had to take it in and have the whole cluser replaced
__________________
2003 H1 HMCS: Ocean Blue Metallic, Grey Leather Interior
2010 H3 Alpha: Canyon Metallic, Cashmere Interior
2017 VW Jetta S
2012 Cessna 182T Skylane
used to have: 2007 base H3 Slate Blue
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