Speedometer Fault
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Freshman User
Joined: Oct 2012
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From: Jacksonville Beach, FL
Speedometer Fault
I have a 2011 F-250 Power Stroke. Since I bought the truck the beginning of 2017, the speedometer has been off. It has been to several Ford dealerships and they keep telling me it is in perfect working order. WRONG!!! I have passed multiple signs that read speed and it always shows between 8 and 10 MPH faster than my gauge. To reassure my suspicion, I had a coworker drive beside me while I was using cruise control to maintain a steady speed of 70 MPH and he is reading 80 MPH. I have tested this with multiple different vehicles and they are all consistent. The truck has 67,xxx miles and I’m running factory size tires as per sticker in door jam. At lower speeds, it shows 5 MPH off and gradually increases with higher speeds. Could this be speed sensors? The truck was manufactured in Kentucky but sold on a dealership on Ontario. Could the gauge cluster have been transferred to kilometers and then transferred back to MPH upon arrival in Ohio where I bought it? I’m at my whites end with this dilemma and as much as I travel, I’m bound to get a speeding ticket. Thanks for any advice.
Tuned
Joined: Dec 2017
Posts: 293
Likes: 29
From: Houston
The Forscan tool will allow you access to your speedo settings. Just used Forscan tool on my much older truck this weekend and had total read/write access to my speedo scaling, should be easy to increase your trucks indicated speed ~14%. Very surprised the dealers did not offer to take care of that seemingly simple task. Just download the tool (free for Win XP, pay small charge for smartphone, purchase the appropriate adapter and obtain the free 2 month license for write privileges).
PS - Please also verify the accuracy of your odometer. If it is under reading ~14% the re-scaling is easy. If the odometer is dead-on accurate the analog output to the speedometer would need to be tweaked, there may or may not be a setting for that. Suspect the dealer verified your trucks settings as being appropriate and the analog output to speedo is the issue..
PS - Please also verify the accuracy of your odometer. If it is under reading ~14% the re-scaling is easy. If the odometer is dead-on accurate the analog output to the speedometer would need to be tweaked, there may or may not be a setting for that. Suspect the dealer verified your trucks settings as being appropriate and the analog output to speedo is the issue..
Senior User
Joined: Nov 2017
Posts: 337
Likes: 0
From: Bellville TX.
My 2000 SD registers a little faster I’m really going.....
I just live with it.....
Like you those “your speed” signs....read a lower speed.....than I’m reading.
I figure its saved me a ticket or two....
I just live with it.....
Like you those “your speed” signs....read a lower speed.....than I’m reading.
I figure its saved me a ticket or two....
Laughing Gas
Joined: May 2017
Posts: 969
Likes: 30
Originally Posted by jetty
The Forscan tool will allow you access to your speedo settings. Just used Forscan tool on my much older truck this weekend and had total read/write access to my speedo scaling, should be easy to increase your trucks indicated speed ~14%. Very surprised the dealers did not offer to take care of that seemingly simple task. Just download the tool (free for Win XP, pay small charge for smartphone, purchase the appropriate adapter and obtain the free 2 month license for write privileges).
PS - Please also verify the accuracy of your odometer. If it is under reading ~14% the re-scaling is easy. If the odometer is dead-on accurate the analog output to the speedometer would need to be tweaked, there may or may not be a setting for that. Suspect the dealer verified your trucks settings as being appropriate and the analog output to speedo is the issue..
PS - Please also verify the accuracy of your odometer. If it is under reading ~14% the re-scaling is easy. If the odometer is dead-on accurate the analog output to the speedometer would need to be tweaked, there may or may not be a setting for that. Suspect the dealer verified your trucks settings as being appropriate and the analog output to speedo is the issue..
Tuned
Joined: Dec 2017
Posts: 293
Likes: 29
From: Houston
But dive in with the 2-month license and one is able to tap into some very powerful configuration options, including ability to program speedo based upon tire size or even # of tire RPM/s per mile. Very powerful stuff, one wants to be very careful and make always make a backup before tweaking a lot of stuff. There are perhaps 100 or more parameters which may be easily configured w/ license. The only question is, prior to this adjustment being made, is weather the OP odometer and speedometer are in fact both under reading, if so the fix is easy.
Laughing Gas
Joined: May 2017
Posts: 969
Likes: 30
Originally Posted by jetty
Not so. The basic imperial or metric config is certainly in Forscan (this option is located on a tab that does some very basic stuff)..
But dive in with the 2-month license and one is able to tap into some very powerful configuration options, including ability to program speedo based upon tire size or even # of tire RPM/s per mile. Very powerful stuff, one wants to be very careful and make always make a backup before tweaking a lot of stuff. There are perhaps 100 or more parameters which may be easily configured w/ license. The only question is, prior to this adjustment being made, is weather the OP odometer and speedometer are in fact both under reading, if so the fix is easy.
But dive in with the 2-month license and one is able to tap into some very powerful configuration options, including ability to program speedo based upon tire size or even # of tire RPM/s per mile. Very powerful stuff, one wants to be very careful and make always make a backup before tweaking a lot of stuff. There are perhaps 100 or more parameters which may be easily configured w/ license. The only question is, prior to this adjustment being made, is weather the OP odometer and speedometer are in fact both under reading, if so the fix is easy.
Yes I know you can adjust tire size and gear ratios to change speed readouts. I thought we were talking about making the speedo accurate.
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