Speedometer not working
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4wd Low
Joined: Sep 2022
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Speedometer not working
after installing a new intake I had a abs light on and speedometer no longer worked? I changed the speed sensor in the rear differential with no change at all. I checked the ground wires on the front of the truck for the abs it was fine I cleaned it up and sanded the frame to make sure it got a good connection. I also checked the wiring running from rear differential to the engine bay looked fine I took apart every plug I could find and cleaned and greased them with electrical lube. This has been going on for about 2 weeks now I noticed I no longer have a abs light but my speedometer still doesn’t work. Any ideas are much appreciated thanks! Edit my cruise control also wont come on assuming it has something to do with the speedometer
Last edited by LastPass; Sep 4, 2022 at 01:29 PM.
Lead Driver
Joined: Jul 2017
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From: WV
I have no experience on this one but have you checked all the fuses?
Otherwise, this happened at exactly the time you installed the intake right? Therefore I would be looking at everything touched during the intake swap.
Otherwise, this happened at exactly the time you installed the intake right? Therefore I would be looking at everything touched during the intake swap.
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4wd Low
Joined: Sep 2022
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yeah checked all the fuses and took out the intake I found the ground wire in front of the intake made sure that was on right but other then that I’m stumped. I appreciate your reply though!
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4wd Low
Joined: Sep 2022
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The truck is a 2003. The speedometer will make a lap if I unplug and replug in the battery so I know the gears are working just not sure why it’s not showing speed.
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4wd Low
Joined: Sep 2022
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i did not I will definitely try that wouldn’t my abs light still be on though if it wasn’t grounding? That’s where I’m lost is I don’t have a abs light anymore but still no speedometer.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Hmmmm, this would also include the need to verify that the axle itself is properly grounded to the frame of the truck as well.
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From: Elk Grove, CA
The HEC cluster has a self diagnostic procedure, that might help too. Starts at about page 9 of the attached pdf.
A lot of the info displayed is hard to read, in hexidecimal code, so maybe print out the pages you need so you can consult them as you click thru the displays. Or make a good video of the display and figure it out later.
A lot of the info displayed is hard to read, in hexidecimal code, so maybe print out the pages you need so you can consult them as you click thru the displays. Or make a good video of the display and figure it out later.
Mountain Pass
Joined: Mar 2006
Posts: 137
Likes: 9
I went through a failed speedometer a while back and ended up needing to replace the cluster. Check the speed sensor in Forscan or the diagnostic tool on the odometer and if it reads the speed then I would guess it is likely the gauge itself as my issue was. If it isn't reading the speed then I would assume wiring somewhere.
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