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Is the check engine light on? Has anything been replaced? Thanks.
Automatic or manual transmission?
I'm fine with doing chat, website tries to push the phone call option
How system works is the speed sensor sends signal to the PCM then the PCM sends signal to the instrument cluster. IF problem was vehicle speed sensor or wiring between sensor and PCM check engine light would be on. And fact speedometer works up until 40 tells us wiring between PCM and instrument cluster should be fine leaving problem as PCM or instrument cluster. If you have a scantool that can read PCM data you can make sure PCM speed is correct, if so this would verify the instrument cluster as the problem. You can buy a used instrument cluster from ebay or www.car-parts.com just make sure mileage is about the same so it doesn't need to be reprogrammed. Let me know if you have more questions or if there is anything else I can do to help, thanks.
Ever get it figured out? Please do not forget to rate answer. Thanks.
Yes it does appear PCM is the problem and it will need to be reprogrammed. Let me know how it goes, thnks. .