Question about Cars & Trucks
I would start with checking the VSS (Vehicle speed sensor) Usually mounted underneath car at the back of the transmission area.
Posted on Nov 12, 2013
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Posted on Jan 02, 2017
All Chevy and GMC trucks (pick-ups, Tahoes, Yukons, Suburbans etc.) during the years 2002-2004 had issues with the IPC (instrument panel clusters). The would be erratic, and sometimes stick at a certain speed and not move, or occasionally work then stop at a speed, then jump to the next speed. It is a common problem. Unfortunately the only fix is to replace the IPC, and have it reprogrammed at a dealership, or repair facility capable of programming. The IPC is actually a module, and communicates on the data line with other computers. The mileage will also need to be reprogrammed into the new IPC.
Posted on Mar 01, 2011
Sounds like you may have a defective instrument cluster.You will have to replace the cluster or have it repaired.Dorman Products have replacement clusters.
Posted on Oct 28, 2011
Let me guess, it goes up to about 30, stays there, and if you go faster (past what would be the halfway point of your speedometer) it starts dropping below 30. It sounds like the type of speedometer that uses two magnetic cores at 90 degrees to each other, and one has gone out.
Troubleshooting and repair should be similar to this: http://www.fieros.de/en/articles/speedo.html
Posted on Mar 01, 2012
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