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My 98 C-5 speedometer just stopped working. All the other guages work. It's stuck at 200mph. Is there a fuse or relay that needs to be replaced. Does anybody know what happened to it. Has anybody else had this problem. If you know your help and knowledge would be appreciated. Thanks
Pull the codes and see if anything comes up. It may be a faulty VSS sensor which I believe plugs into the diff. I'm sure someone will correct me if I am wrong.
I have worked on some cases where the needle gets stuck and you just have to access the IPC and give it a nudge with your finger to fix it. It probably did that on an initial startup sweep. If you need to try that here is how to access the IPC.