Not to say this is your problem but We had one last week, My solus pro said exactly the same "internal failure of ecu" and therefore no data, my thoughts were the same as yours. customer took it to a RR specialist they told him the ecu was bullit proof and diagnosed no speed signal from osr sensor, they sold him a sensor and brought to to me to fit .we found the sensor wire cut cleanly in half on the axle soldered back together and happy days.Also as sensors are a push fit worth checking air gaps.
Good luck,
Steve Sneap.
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