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Old 06-14-2017, 04:03 PM   #67 (permalink)
gone-ot
...beats walking...
 
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Quote:
Originally Posted by fearlessjoe View Post
i know this is an old thread, but its a sticky

does anyone elses scanguage read a different speed to the car

as in, if i set my cruse control to 50, the speedo says 50, and my scanguage says 45

i havent used a toptop to see how fast im actually going yet but it seems odd that it would read a different speed then the car itself
What vehicle? GM purposely sets their speedometers to read 2 mph slow (just to save you from tickets). The SG reads what the WHEEL is actually reporting to the ECU, so it's the SPEEDO circuitry that's subtracting 2 mph...hence the two different readings.

FWIW, a 5 mph difference would seem to indicate wrong tyre size (vs OEM).
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