There are a number of things that need to be checked before we think one of the speed sensors is the issue.
The way this works is basically the speed signal it passed through different modules before the speedometer displays this signal.
I attached the info but basically the CAB gets the rear wheel speed signal and sends it to the PCM. The PCM sends it to the speedometer where it is displayed.
The best way to find this out, is to check the PCM with a scan tool to see if it registered the vehicle speed. If it does then the issue is between the PCM and cluster, most likely the cluster. If not, then the issue is between the speed sensor, CAB, or wiring to the PCM.
Does this make sense? Do you have a scan tool and can you also check for codes?
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
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Sunday, September 6th, 2020 AT 5:16 PM