BMW N54 MSD80 DME MOSFET Replacement Service
BMW N54 MSD80 DME MOSFET Replacement Service
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BMW N54 MSD80 DME MOSFET Replacement Service
This is a mail-in MOSFET replacement service for BMW vehicles equipped with the Siemens MSD80 DME and N54 engine.
The MSD80 is known for failure of the MOSFETs used in the injector driver circuits. Failed MOSFETs can cause DME internal fault codes, cylinder misfires, rough running, loss of power, or cylinders that are not firing.
For this service, you send us your original MSD80 DME and we replace all six injector-driver MOSFETs with upgraded replacement components.
COMMON FAULT CODES
MOSFET failure in the MSD80 is commonly associated with:
- 30BA – DME Digital Motor Electronics, internal failure
- 30BB – DME Digital Motor Electronics, internal failure
- 29CD – Cylinder 1 misfire
- 29CE – Cylinder 2 misfire
- 29CF – Cylinder 3 misfire
- 29D0 – Cylinder 4 misfire
- 29D1 – Cylinder 5 misfire
- 29D2 – Cylinder 6 misfire
- 29CC – Misfire, multiple cylinders
Misfire codes alone do not confirm a MOSFET failure. Misfires may also be caused by injectors, ignition coils, spark plugs, fuel system problems, wiring, mechanical issues, or other DME faults.
WHAT THIS SERVICE INCLUDES
- Replacement of all 6 injector-driver MOSFETs
- Upgraded replacement MOSFETs
- Inspection of the replaced components and solder connections
- Return of your original DME
This is a MOSFET replacement service, not a diagnostic service. We replace all six injector-driver MOSFETs as requested regardless of whether an individual MOSFET has been confirmed failed.
Because your original DME is being serviced, no cloning, VIN programming, immobilizer programming, or coding is normally required. Your existing vehicle-specific data remains in the DME.
IMPORTANT — PLEASE READ
This service replaces the six injector-driver MOSFETs in your MSD80 DME. MOSFET replacement is not guaranteed to correct your vehicle's symptoms if the underlying problem is caused by another component or system.
Before ordering, we recommend properly diagnosing the vehicle and confirming that the symptoms are consistent with an MSD80 MOSFET-related failure.
MSD80 ONLY
This service is specifically for the Siemens MSD80 DME.
This service is not for MSD81.
Please verify that your DME is labeled MSD80 before ordering. If you are unsure, contact us with a clear photo of the DME label before purchasing.
COMPATIBLE BMW VEHICLES
MSD80 DMEs are found in select BMW vehicles equipped with the N54 engine, including:
- BMW 135i – E82 / E88
- BMW 335i / 335xi – E90 / E91 / E92 / E93
- BMW 535i / 535xi – E60 / E61
- BMW X6 xDrive35i – E71
- BMW Z4 sDrive35i – E89
Vehicle model or year alone does not guarantee that the vehicle uses an MSD80. Verify the DME label before ordering.
THIS SERVICE DOES NOT INCLUDE
This listing is specifically for replacement of the six MSD80 injector-driver MOSFETs.
It does not include diagnosis or repair of:
- Water or corrosion damage
- Physically damaged circuit boards
- Failed processors or memory devices
- Power supply or communication faults
- Fuel injector problems
- Ignition coils or spark plugs
- Fuel system problems
- Vehicle wiring
- Mechanical engine problems
- Other unrelated DME faults
If the MOSFETs are not the cause of your vehicle's problem, replacing them may not correct the symptoms.
MAIL-IN SERVICE
This listing does not include a DME.
You must send your original MSD80 DME to us for MOSFET replacement.
After the service is completed, your original DME will be returned to you with all six injector-driver MOSFETs replaced.
This product description is original content.
Unauthorized copying, scraping, or reproduction is prohibited.
Protection ID: VELECTRONIX-ORIGINAL-CONTENT-2026-V1
Common Part Numbers
Common Part Numbers
7546141, 7550014, 7565859, 7565860, 7567229, 7567232, 7567491, 7567492, 7567542, 7567543, 7568370, 7568371, 7568842, 7568843, 7569978, 7569979, 7571468, 7571469, 7572063, 7572064, 7572067, 7572068, 7573796, 7573797, 7573863, 7573864, 7574534, 7574535, 7575875, 7575876, 7576719, 7576720, 7576721, 7576722, 7578020, 7578021, 7578441, 7578442, 7583332, 7583333, 7586938, 7586939, 7586940, 7586954, 7588620, 7588621, 7594305, 7594306, 7595235, 7595236, 7596017, 7596018, 7611396, 7611397
General FAQ
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What is immo off or immobilizer delete, and will it work for my VW or Audi?
Immobilizer delete (immo off) bypasses the immobilizer in the engine control unit (ECU) of VW and Audi vehicles. It’s used when the vehicle starts but immediately shuts down due to a fault in the immobilizer system, often with fault codes P1570 or P0513. Immo off services will not work if the vehicle does not start at all; it must start and then be shut down due to the immobilizer.
What is module cloning, and do part numbers need to match?
Module cloning involves copying all the data from one module to another, allowing the replacement to function just like the original. While it's generally recommended to match part numbers for compatibility, the necessity can vary by module. Some require exact matches, while others are more flexible and allow cloning between different part numbers. Each product listing on our website specifies the part number requirements. If you're unsure, feel free to reach out for guidance.
Do you have to open the module cases?
We only open module cases when absolutely necessary. For services that don’t require opening, we won’t open the module. However, depending on how badly damaged your original ECU is, sometimes opening the module is the only way to retrieve data. Additionally, some services don’t have a plug-in method at all and require direct access to the board, including soldering or chip replacement. The need to open modules is not specific to us but is sometimes essential depending on the condition of the ECU.
What are the shipping procedures and turn around times?
After purchasing, you will receive an email with shipping instructions. You are responsible for shipping your modules to us, and we will cover the return shipping. You can use any shipping service that is convenient for you. We typically use UPS Ground (3-5 days) for return shipping, but in some cases, we may use USPS or FedEx. Once we receive your package (shipping times depend on how quickly you ship it and the service used), we typically ship it back the next business day. Some services may require a 2-day handling time, depending on the complexity.
For detailed shipping times to and from your location, check out our shipping speed map.
What is the warranty?
We offer a 90-day warranty on programming only. This covers the accuracy of the programming performed, but does not extend to the module hardware itself.
BMW N54 MSD80 DME MOSFET Replacement Service
