Quote:
Originally Posted by fearlessjoe
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
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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).