So I just started having an intermittent issue with my speedometer reading fast. Sometimes it works fine others not. Sometimes it registers 10 - 15 mph standing still. I turn off the van and it resets. Any Ideas? Is there a way to troubleshoot with Forscan?

13 E350 5.4

 

With Forscan, YOU do the troubleshooting with the info provided, PIDS, mainly and freeze frame data
Been in a wreck?
IMO you have a wiring short to b+ somewhere or possibly the cluster itself is the fault
There are flow charts and diagnosis materials for that in the service manual
There might even be a bulletin about it on OASIS
I would at least call a dealer you think might be honest and ask them if they have had a bunch of complaints like yours
Cluster is about a thousand bucks installed
If the VSS is not putting out a voltage signal sitting still, you have a short or the cluster needs to be interrogated
That PID you CAN check using Forscan
You better look at a PID list for your 2013 to be sure of the name
Also, I would look at a 2013 Ford service manual to see the actual diagnostic procedure for cluster problems like yours is having
Running your vin through Oasis is a must IMO for your problem (unless it has been wrecked)
If you google your speedo problem you will hear of people replacing the cluster and also resetting the gauges
I would do the reset procedure and see what happens
Simply hold down the reset button and turn the key on

 

Thank you.
I have not been in an accident.
The van only has 30K. Government purchase. 10 years old and they sell.
I did the reset and will take note the next few days.
I will monitor whatever PIDS I can find relating to speed.
This is my work truck and I will monitor every day I have work. I will not comment on the economic impact to the small business the current administration is levying.
Having only 30K I have not purchased the service manuals. I shouldn't have any issues for another 100K or so.
I did do an internet search and most of what I saw was stupid stuff like take the needle off and reposition it. I suppose that's what you get when you use g@@g!e. I won't comment on how nefarious and despicable a company they are.
I don't know how to access OASIS

 

Does the odometer rack miles faster when the speedo reads high? Do you have an OBD device that displays mph for comparison? Hopefully you can isolate it as a speed sensor problem or speedo problem. My guess is it’s a speedo problem since you didn’t mention unexpected shifting behavior.

@manicmechanic007 , does the PCM or VSC compare transmission output to VSS?

Sixto
07 E350 5.4 198K miles

 

I hooked up Forscan and pulled up all of the Vss modules I could find. Disappointing how little info is available.
I found a DTC. P0297 Vehicle over speed condition.
Dashboard is 4-5 mph slower than speedo.
Did notice a 1.2 mph difference in two of the values. Don't know what that means.
I'm going to look at a different program to see if I can find something else.


Thank you for your replies.