Automatic BMW transmission’s have their own control unit. This control unit is referred to as the EGS and its primary function is to control the gearbox. As a control unit they rarely fail but the components they drive do.
The EGS is also responsible for detecting and recording faults. So if you see this light:
The EGS control unit has picked up a fault with the correct opperation of the gearbox and it requires specialist attention. Most diagnostic scanners that general vehicle repairers use are incapable of even communicating with the EGS as their scanners are designed for the main engine control unit only.
Ignoring this light can result in damage to the internals of the gearbox.
We charge a flat rate of £66.50 + VAT for electronic diagnostic of the EGS.