Re: 2003 Chevy Silverado, Mechanic ??
[Re: Nothwoods Bandit]
#6748596
01/28/20 09:58 PM
01/28/20 09:58 PM
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Joined: May 2011
Posts: 7,939 Montana
beartooth trapr
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Posts: 7,939
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Check the wiring going into the sensor plug in , my 2006 had this problem. They put the plastic tubing over the wires but mine still broke at the plug in . I had to cut it apart to find the problem.
Let me sugar coat this
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Re: 2003 Chevy Silverado, Mechanic ??
[Re: Nothwoods Bandit]
#6748614
01/28/20 10:09 PM
01/28/20 10:09 PM
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Joined: Feb 2007
Posts: 5,366 New York border
Cragar
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New York border
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I had an 04 GMC Serria 2500HD , same truck. There was a recall of some sorts for the speedo , had it replaced for free a few years back. Never had a problem with mine , just got the notice in the mail and got it done. Link - https://drspeedometer.com/silverado-speedometer-recallIt looks like the time to have this done has expired. Check with your dealer , ask nicely to see the factory rep , maybe you might get some help.
Last edited by Cragar; 01/28/20 10:14 PM. Reason: Added link
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Re: 2003 Chevy Silverado, Mechanic ??
[Re: Nothwoods Bandit]
#6748634
01/28/20 10:27 PM
01/28/20 10:27 PM
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Joined: Jun 2018
Posts: 4,739 Beatrice, NE
loosegoose
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I don't think it's in the cluster, I had some issues with the speedo a couple years ago and replaced the stepper motor and it worked fine. At that time the needle had been jumping all over the place and sometimes got stuck, but this time it just stays at the zero mark and doesn't move at all?? All the other gauges work fine, and I did replace the stepper again on the speedo, but still the same results. So I don't think it is the actual instrument cluster?? With the odometer not working as well, I'm wondering if it could be something other than that?
Neither the vehicle speed sensor not the crank sensor (which detects engine RPM) communicate directly with the instrument cluster. They both communicate with the power train control module, which they communicates the info to the instrument cluster over a network. If there was a problem with the crank sensor you would have a check engine light,and most likely an engine that wouldn't start. If you had a problem with the vehicle speed sensor you'd likely also have a problem with the ABS as well, as vehicle speed is an important input for antilock brakes. It's be extremely rare to have a problem at the same time with both sensors but I suppose it's possible. A scan tool would easily reveal that info. But it'd be even more rare to have a problem with both systems in a way that didn't also cause a check engine light or ABS issues. I suppose it's possible but highly unlikely. All the other gauges (oil pressure and voltage and fuel level) also get their info from the same network as the speedo and tach, so we can eliminate a network problem, and we know it has power and ground since the other gauges work, so that leaves the instrument cluster itself as the likely culprit.
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Re: 2003 Chevy Silverado, Mechanic ??
[Re: loosegoose]
#6748642
01/28/20 10:35 PM
01/28/20 10:35 PM
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Joined: Sep 2010
Posts: 117 upper michigan
Nothwoods Bandit
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I don't think it's in the cluster, I had some issues with the speedo a couple years ago and replaced the stepper motor and it worked fine. At that time the needle had been jumping all over the place and sometimes got stuck, but this time it just stays at the zero mark and doesn't move at all?? All the other gauges work fine, and I did replace the stepper again on the speedo, but still the same results. So I don't think it is the actual instrument cluster?? With the odometer not working as well, I'm wondering if it could be something other than that?
Neither the vehicle speed sensor not the crank sensor (which detects engine RPM) communicate directly with the instrument cluster. They both communicate with the power train control module, which they communicates the info to the instrument cluster over a network. If there was a problem with the crank sensor you would have a check engine light,and most likely an engine that wouldn't start. If you had a problem with the vehicle speed sensor you'd likely also have a problem with the ABS as well, as vehicle speed is an important input for antilock brakes. It's be extremely rare to have a problem at the same time with both sensors but I suppose it's possible. A scan tool would easily reveal that info. But it'd be even more rare to have a problem with both systems in a way that didn't also cause a check engine light or ABS issues. I suppose it's possible but highly unlikely. All the other gauges (oil pressure and voltage and fuel level) also get their info from the same network as the speedo and tach, so we can eliminate a network problem, and we know it has power and ground since the other gauges work, so that leaves the instrument cluster itself as the likely culprit. Would this also cause the odometer not to register?? I guess that was why I thought perhaps it could be one of the speed sensors either connected by they wheels or the ones on the transmission. I currently don't have any dash lights on, and I did plug in my code reader and it said NO Codes found.
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Re: 2003 Chevy Silverado, Mechanic ??
[Re: 52Carl]
#6750032
01/29/20 10:30 PM
01/29/20 10:30 PM
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Joined: Feb 2007
Posts: 5,366 New York border
Cragar
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Sounds to me like the consensus is "cluster **** ." Voted best comment of the thread........lol
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