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I wonder if anyone can assist.
I have a 2003 E46 M3 with SMG gearbox and it has suddenly stopped selecting gears. The message on the diagnostic machine was 'Main pressure regulator short to B+' apparently this is fitted to the electro hydraulic control unit on the gearbox. Does anyone know how extensive these works are and a rough idea of cost?

Regards,
Mark
 

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My colleague ended up paying around $5000 to fix his SMG. First they tried smaller things but ended up replacing the gear actuator.
 

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