⚠️ Seeing BMW fault code 30BA or 30BB?
🔧 Misfires on multiple cylinders, even after replacing coils and plugs?
🛠 We repair BMW MSD80 ECUs suffering from internal damage—quickly, permanently, and with a lifetime warranty
If you’re chasing persistent misfires and seeing codes like BMW 30BA – DME Internal Fault and 29CF to 29DA – Cylinder Misfire Detection, the root cause is likely not your ignition system. Instead, these faults are commonly linked to internal failure of the MSD80 ECU—fitted to many BMW N54-powered models such as the 335i, 135i, 535i, and Z4.
At ECU Fix, we offer a professional repair service for this exact fault. We restore your ECU’s function with no coding required, and all successful repairs include a lifetime warranty.
🔍 Understanding the BMW 30BA Fault
The 30BA (and its counterpart 30BB) fault codes stand for:
DME Internal Fault – Control Unit Memory Check Error
This code usually appears alongside misfire faults like:
- 29CF – Cylinder 1 Misfire
- 29D0 – Cylinder 2 Misfire
- 29D1 – Cylinder 3 Misfire
- 29D2 – Cylinder 4 Misfire
- 29D9 – Cylinder 5 Misfire
- 29DA – Cylinder 6 Misfire
You may have replaced coils, plugs, injectors—or even tested compression—yet the faults return. That’s because the ECU itself is failing to deliver or manage spark properly, especially under load.
⚠️ Symptoms of MSD80 Internal Fault (BMW 30BA)
If you’re seeing fault code BMW 30BA, you may also notice:
- Rough idle or hesitation
- Misfire fault codes across multiple cylinders
- Poor performance under acceleration
- Engine management light (EML) on
- Cylinder shut-down or limp mode
- Faults return after coil, plug, or injector replacement
These symptoms all suggest the DME isn’t functioning correctly, due to internal component failure.
🛠 How We Fix BMW 30BA Fault in MSD80 ECUs
Rather than replacing the ECU—an expensive part that often needs dealer programming—we carry out a specialist in-house repair.
Our service includes:
- Bench testing of ignition output stages
- Diagnosis of memory checksum or internal regulation faults
- Replacement of failed drivers, components, or PCB traces
- Testing under simulated engine load
- Final inspection and lifetime warranty
Once repaired, your ECU is ready to refit—no coding or alignment required in most cases.
BMW MSD80 Engine ECU Repair Service
🚗 BMW Models Affected by MSD80 ECU Misfire and 30BA Fault
We regularly repair this issue in BMW N54-equipped cars, including:
- BMW 135i (E82, E88) – 2007–2010
- BMW 335i (E90, E91, E92, E93) – 2006–2010
- BMW 535i (E60, E61) – 2007–2010
- BMW X6 xDrive35i (E71) – 2008–2010
- BMW Z4 35i (E89) – 2009–2011
All of these use the MSD80 DME, which is known for developing BMW 30BA internal fault codes with age and thermal cycling.
- 7575875 / 7583332 / 7594305 / 7586940 / 7573863 / 7588620
- 5WK93614 / 5WK93628 / 5WK93648 / 5WK93651 / 5WK93642 / 5WK93650
⚙️ Why Choose ECU Fix?
- ✅ Specialist MSD80 ECU repairs
- ✅ Lifetime warranty on every successful repair
- ✅ Fast turnaround—usually 24–48 hours
- ✅ No coding or adaptation required
- ✅ UK-wide courier collection available
- ✅ No fix, no fee—you only pay collection & return shipping if we can’t repair
Whether you’re a performance workshop or BMW owner, we deliver a fast, affordable solution.
📦 How to Book Your BMW 30BA ECU Repair
- Click “Shop Now” to start your booking
- Choose courier collection or send us your ECU
- We repair and return it ready to refit
- Clear codes, start the engine, and confirm no more misfires