Speedometer froze at 65mph. now it goes from 65 to above 120
The speedo head is electronically controlled and is fed it's information from the vehicle speed sensor, or VSS sensor, depending on engine and transmission the VSS directs information to the speedo head threw the computer so it has to be tested to see if it is OK. If there is no check engine light then it may mean it's the speedo head itself that is defective. You can try and remove it out of the dash and replace the speedo head but normally this has to be done by a certified mechanic He has to write on the work order the mileage on the truck and when installing the new speedo he has to put a stamp on your door with his company name and when he did the replacement head. There are no mechanical connections like o the older cars, it is fed threw the transmission computer vehicle sensor or how ever the power train management system it is not a mechanical problem except for the speedo head it self. The needle windings may have stuck or a piece of plastic could have broke off and wedged itself inside the head itself. If you want instructions on how to remove your speedo head I can give you the instructions to do so, The speedo head will come out and you can buy them at a junk yard and maybe the dealer if they still have them available, otherwise they sell it as a full instrument cluster set. There are after market parts you can by at Schucks, Nappa or Auto zone, they run about $150.00 dollers and normally have a white face with black letters. Hope this helps and if you need more help don't be bashful about asking.
Nov 29, 2009 |
2004 GMC Sierra