Unlikely a defective fuse I would think - speedo is likely computer driven and as the trouble started with the repair shop I suggest you take the car back to them and complain; along with resetting the oil mileage I expect they managed to upset the speedo. Routine work such as oil changes are often performed by unskilled labour in many repair shops.
SOURCE: Speedometer erratic
I have the same problem with my car..It is the speedo in the car that is bad...check into getting that replaced it should work fine after that.
SOURCE: 1988 Dodge D150 Erratic Speedometer
Unscrew the speedometer cable from the back of the gauge and from the transmission, take the cable out of the sheath, clean it off with carb or brake cleaner, oil it and put it back in. If that doesn't do it, replace cable assembly. If that doesn't do it, pull the speedometer gear out of the transmission and check for wear. Replace if needed.
sounds like your missing a ground somewhere.
SOURCE: speedometer not registering speed correctly, also not getting any cool air from air conditioner
pretty sure its in kph there should be a button with your menu
SOURCE: Speedometer not working
There was not a recall, but there was a class action settlement where GM agreed to extend the warranty on certain vehicles for this problem. Check www.gmspeedometerrecall.com to see if you qualify.
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Hi Barbara Wedgeworth, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? What Cadillac Model?
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