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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Speedometer is off? Four miles per hour higher then GPS/Phone

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      03-16-2020, 02:01 PM   #1
MineralM
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Speedometer is off? Four miles per hour higher then GPS/Phone

Does anyone else have this issue?

Taking my car to BMW Tomorrow for them to check it out.
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      03-16-2020, 02:25 PM   #2
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What country are you based in?
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      03-16-2020, 02:26 PM   #3
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Mine shows exactly 2 MPH higher (always) than my phone’s GPS as well as the roadside speed warning signs that show what speed you’re traveling at. Doing a bit of reading, I found out that that’s how BMW codes the speedometer. The correction can be turned off in older cars to show the exact speed. It should be doable in the G20s too.
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      03-16-2020, 03:37 PM   #4
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This is nothing new.

https://www.google.com/search?rlz=1C...71.-ioDqp63gLc
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      03-16-2020, 03:57 PM   #5
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I thought they do it in purpose?? I remember reading it somewhere
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      03-16-2020, 04:03 PM   #6
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Quote:
Originally Posted by Weiner0123 View Post
I thought they do it in purpose?? I remember reading it somewhere
Yup. It’s done on purpose.
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      03-16-2020, 04:08 PM   #7
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Quote:
Originally Posted by Weiner0123 View Post
I thought they do it in purpose?? I remember reading it somewhere
Yes it does read high on purpose. It is so that when you are in a speed control area and you do the advised speed on the speedometer then the car will always be below the required speed. Allows for some error in instruments and stops any legal action against car manufacturers.

Or put another way (from a U.K. website)

To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount. As your satnav is not the designated device by which a car’s speed is measured, it does not need to incorporate any fudge factoring.
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      03-16-2020, 04:09 PM   #8
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Quote:
Originally Posted by Weiner0123 View Post
I thought they do it in purpose?? I remember reading it somewhere
Yes, Type Approval in Europe dictates over reading. Must never under read.

Appropriate regulation....

3. For all true speeds of between 25 mph and 70 mph (or the maximum design speed if lower), the difference between the indicated speed and the true speed shall not exceed—
V / 10 + 6.25mph
where V = the true speed of the vehicle in mph.
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      03-16-2020, 05:40 PM   #9
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Quote:
Originally Posted by VipinLJ View Post
Mine shows exactly 2 MPH higher (always) than my phone’s GPS
Same here
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      03-16-2020, 06:44 PM   #10
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You can code it to be accurate, I have done mine
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      03-17-2020, 06:26 AM   #11
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sometimes my M340I is accurate. However using Waze its sometime 4 to 6 mph off. Showing lower than the speedo. Makes me wonder if I am going slow. Could be why drivewise from Allstate does not catch all my over 80 incidents.
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      03-17-2020, 08:38 AM   #12
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Quote:
Originally Posted by cnichols138 View Post
sometimes my M340I is accurate. However using Waze its sometime 4 to 6 mph off. Showing lower than the speedo. Makes me wonder if I am going slow. Could be why drivewise from Allstate does not catch all my over 80 incidents.
This is no different from my E90 and was also programmed to be about 75 MPH (by gps) while driving at 80 by indication.
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      03-25-2020, 08:17 PM   #13
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Quote:
Originally Posted by siegester View Post
You can code it to be accurate, I have done mine
What did you use to code it out?
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      03-26-2020, 04:43 AM   #14
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Quote:
Originally Posted by siegester View Post
You can code it to be accurate, I have done mine
When you say code it to be 'accurate', what tire tread depth do you set it at? Say you code/set it for a new tire, it will not be accurate when at minimum tread depth.
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      03-27-2020, 07:05 AM   #15
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[QUOTE=JoCamp;25969488]What did you use to code it out?https://g20.bimmerpost.com/forums/sh....php?t=1697373
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