2015 + Expedition & Navigator 2015 + Ford Expedition and Lincoln Navigator Show Speedometer off by 3mph? Junior User Thread Starter Join Date: Feb 2003 Posts: 96 Likes: 0 SOLVED - Early production 2016 appears to use the 2015 locations (i.e. 726-45-01). My 2016 is reading 3mph faster than the vehicle is going? Confirmed with another vehicle and gps. Tires are properly inflated. On my 2nd set of tires; exact size replacements for OEM. I guess my odometer is showing more miles than actually traveled. That's a lot with 65k on the clock. Anyone else have this issue? Is there a way to recalibrate? Last edited by developer; 12-23-2020 at 05:37 PM. Reason: solved. Moderator Join Date: Apr 2008 Location: 0,0,1 Posts: 21,442 Often a speedometer is off by a percentage and not by a fix amount like 3 MPH. This means the faster you go the more it is off, so in reality the issue is not as bad as you might think it is. You're reading is off by 4.2% which means at 35 MPH it's off only 1.5 MPH. Junior User Thread Starter Join Date: Feb 2003 Posts: 96 Likes: 0 In and of itself, it's not the worst that could be wrong, but the accumulated miles on the odometer are surely exaggerated. That is a significant issue, so I'd like to resolve it. Hoping there is a way to do it with some parm change in firmware. I can't be the only one with this issue. Join Date: Jul 2019 Posts: 563 Quote: Originally Posted by developer Anyone else have this issue? Is there a way to recalibrate? Is it an issue, per se? I guess Ford has gone with it this long, so not really. My �03 is a flat 3 MPH over at all times. I figure it�s a way for Ford to shave a few thousand miles off their warranty obligation.*. My truck has the factory issued tire size on it, so it isn�t a matter of someone dropping the smaller sized option on and leaving it. *I�ve driven a handful of vehicles that have an average MPH info display. Typically, they sit around 30 MPH when I get in them. That�s a 10% error, about 3,000 fewer miles Ford sweats out the 3/36,000 warranty. Beancounters strike again. Post Fiend Join Date: Jan 2004 Location: Brentwood,CA Posts: 26,007 It can be adjusted in forscan. Join Date: Jul 2006 Location: Detroit Posts: 4,503 Get on a freeway and check your odometer against mile markers for a distance of 10-20 miles at least. With modern electronics, there are instances of cars that have speedometers that over-read but odometers that read right on. If you change wheels/tires to a larger or smaller diameter, I would expect the speedo/odo error to match. But if you are at stock tire size, the factory settings may be different from one another. Junior User Thread Starter Join Date: Feb 2003 Posts: 96 Likes: 0 Quote: Originally Posted by ford390gashog It can be adjusted in forscan. Yes, that is what I researched and found, but there is another problem... The Body Control Module settings have 4 selections for tire size. The one that I have 275-65-R18 doesn't have the correct circumference in millimeters (from the factory!). This is why the speedometer is wrong. So, with the forscan, I will have to go into the BCM as-built to get at the pigeonhole for the circumference. In docs I've seen in the forums, that's 726-12-01. When I went to look at that, it is definitely not a tire circumference. So it got me thinking that my 2016 is an early model that was made in 2015. My rear wiper is different than other 2016s. So, is it possible that the location of tire circumference in my BCM is not 726-12-01? If I look at that for 2015, it is the "use fogs as drl's" setting. That being the case, there may be another location that holds the circumference. There are two ways to find out... One is to change the tire size in the BCM from the selection and see what changes in the BCM as-built. I don't like that idea because a lot of other modules use the circumference (ABS, fuel consumption, etc), and I don't want to set/reset/etc iterate. The other is to find someone who has a 2016 like mine and who knows the actual location for the circumference in the BCM as-built. I'm open to suggestions, but leaving it as-is won't work for me. The difference is large and I already have thousands of miles more on the clock than I actually
drove. Trending TopicsJunior User Thread Starter Join Date: Feb 2003 Posts: 96 Likes: 0 Solved. Early production 2016 appears to use location 726-45-01. 2nd value on mine is 0x9D0, which is the 2512 for the factory tires. Last edited by developer; 12-23-2020 at 05:46 PM. Reason: just deleting other thread. Thread Thread Starter Forum Last Post Ltngdrvr 6.7L Power Stroke Diesel 34 04-25-2014 12:03 AM sloridef150 Brakes, Steering, Suspension, Tires, & Wheels 4 10-18-2010 08:29 PM FORDF250HDXLT Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 23 08-14-2010 03:03 PM
manger 1987 - 1996 F150 & Larger F-Series Trucks 3 10-14-2009 09:57 AM 98powerstang 1987 - 1996 F150 & Larger F-Series Trucks 11 01-23-2007 02:43 PM What would cause a speedometer to be off?The most common causes of a speedometer that stopped working include are a faulty speed sensor, a broken gear on the speedometer, damaged wiring, or a faulty engine control unit.
How do you recalibrate a speedometer?Press and hold the calibration button located on the speedometer, start the vehicle, and then release the button. Press that button again and then take the test drive. Once you have driven the distance needed, press the button once more and the speedometer will calibrate itself to accommodate the new tire size.
Why is my speedometer reading slower than actual speed?Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed. This is because a taller tire will have a larger overall circumference, causing it to need to travel more distance per revolution than the original equipment tire.
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My speedometer is off by 3 mph
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