Cause
Vehicle genuinely driven above its speed limit
The vehicle driven faster than the speed limiter permits, which is a recorded event rather than a fault. Many vehicles are limited for tyre rating, gearing or legal reasons, and exceeding it stores a code.
It matters diagnostically because the code names a speed fault and sends people to sensors that are working correctly. Check the freeze frame — a road speed at or above the vehicle's stated limit, with everything else normal, is the limiter doing its job. The other route in is a wrong speed calculation: an incorrect tyre size or final drive makes the module believe the vehicle is faster than it is, so a limiter intervening at an implausibly low indicated speed is a calibration question rather than a driving one.
Typically an easy fix. Often worth checking before paying anyone to look.
Codes this can cause (1)
Codes where this is a likely explanation first, rather than merely a possible one.
Information, not instruction
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