Upgrade Kit (6 transistors MOSFET FDB 14N30 ) for repair and upgrade an BMW Siemens DME MSD80 / MSD81 ECU (Engine Control Unit)

ECU Siemens MSD80 W644B transistorsThis BMW Siemens MSD80 or MSD81 DME (Digital Motor Electronics) unit used in many BMW vehicules from 2006 to 2013 years with N54 or N54T 6 cylinder turbo engine.

Engine misfire is a very common problem across the BMW models fitted with this engine ECU. The vehicules with Turbocharged N54 engines and MSD80 DME Software can develop fuel injector MOSFET driver failure. This will cause an injector to stop delivering fuel and an engine misfire to occur. Each injector (from 6 injectors total) has a single MOSFET (transistor) driver. These MOSFETs are responsible for fuel injection activation, so to fixe the problem the failed MOSFETs must be replaced.

Common Failure symptoms:

  • Engine misfiring constantly
  • No injector signal
  • Engine management light illuminated
  • Loss of power

Affected models:

  • BMW 135i 2007-2013 (E82)
  • BMW 335i 2007-2008 (E90)
  • BMW 335xi 2007-2008 (E91)
  • BMW 335i 2007-2010 (E92)
  • BMW 335i 2007-2010 (E93)
  • BMW 535i et 535xi (E60) 2009-2010
  • BMW Z4 35i 2009-2016 (E89)

Diagnostic fault codes (error messages):

  • 30BA – DME Digital Motor Electronics, Internal Failure
  • 30BB – DME Digital Motor Electronics, Internal Failure
  • 29D0 – Cylinder 4 Misfire
  • 29D1 – Cylinder 5 Misfire
  • 29D2 – Cylinder 6 Misfire
  • 29CD – Cylinder 1 Misfire
  • 29CE – Cylinder 2 Misfire
  • 29CF – Cylinder 3 Misfire
  • 29CC – Misfire Multiple Cylinders

With our Upgrade kit for BMW Siemens DME MSD80 / MSD81 unit you can definitely fix the problem with your BMW ECU unit yourself !

mosfet FDB 14N30The Upgrade Kit For BMW N54 Siemens MSD80 /MSD81 DME unit contains 6 MOSFET transistors FDB 14N30 (more powerful then original W644B transistors !).

Please note that the kit fits to N54 or N54T 6 cylinder turbo engine only.

Please note that all 6 original W644B transistors, even they are in good condition, must be replaced by new FDB 14N30 transistors.

The price of « Upgrade Kit for BMW MSD80/MSD81 DME Unit » is €35,00 + international postage €6,20 .

We sell only high quality components from the leading manufacturers of electronic components.

Shipping within one business day after receipt of payment.

A repair videos are sent you by email.




A basic experience in welding of electronic components is required to properly repair of your BMW MSD80/MSD81 DME Unit.

Do not hesitate to contact us for more information.