🔧 Replaced coils and plugs but misfires won’t go away?
⚠️ Still seeing misfire fault codes across multiple cylinders?
🛠 ECU Fix repairs BMW engine ECU misfire faults—quickly and permanently, with no coding required
If you’re dealing with a BMW engine ECU misfire, even after replacing coils, spark plugs, or injectors, the root cause may not be mechanical. Fault codes like 29CC, 29CF, and 29D0 through 29DA are often signs of an internal fault within the ECU itself—especially in six-cylinder petrol models.
These issues typically begin with misfires under load or during cold starts and can progress to full cylinder shutdown and warning lights. The good news? You don’t need to replace the ECU. At ECU Fix, we specialise in diagnosing and repairing BMW engine ECU misfire faults, offering fast turnaround and a lifetime warranty.
🔍 Common Misfire Fault Codes That Point to ECU Failure
BMW misfire codes are often misunderstood. While they may initially point to faulty coils or spark plugs, repeated failures—especially across different cylinders—can be traced back to the engine control unit itself.
You may be seeing:
- 29CC – Misfire Detection, Multiple Cylinders
- 29CF – Cylinder 1 Misfire
- 29D0 – Cylinder 2 Misfire
- 29D1 – Cylinder 3 Misfire
- 29D2 – Cylinder 4 Misfire
- 29D9 – Cylinder 5 Misfire
- 29DA – Cylinder 6 Misfire
If more than one cylinder reports misfires—or if the faults move between cylinders—it’s likely the ECU is at fault, especially if all ignition components have been replaced.
⚠️ Symptoms of BMW Engine ECU Misfire Fault
These ECU-related misfires often present with the following symptoms:
- Rough idle or engine shaking at start-up
- Engine management light (EML) illuminated
- Misfire fault codes returning after parts are changed
- Power loss or hesitation under load
- Cylinder shut-down or limp-home mode
- Inconsistent misfire behaviour that worsens over time
If you’ve already replaced ignition coils, plugs, or injectors and the issue persists, it’s time to inspect the ECU.
🛠 How ECU Fix Repairs BMW Engine ECU Misfire Issues
Rather than replacing the engine ECU—which is costly and usually requires coding—we carry out component-level repairs that solve the root cause of the misfires.
Our process includes:
- Bench testing ECU ignition outputs
- Fault isolation using real-world load simulation
- Replacement of failing ignition driver circuits
- Verification across all six cylinders
- Return ready to refit—no coding required
- Covered by our lifetime warranty
This means your engine will run smoothly again—without the misfires returning weeks later.
BMW MEVD17.2.5 Engine ECU Repair Service
🚗 Common Vehicles and Part Numbers – Examples Include, But Are Not Limited To
We regularly repair this issue on:
- BMW 1 Series (F20, F21)
- BMW 3 Series (F30, F31)
- BMW 4 Series (F32, F33)
- BMW 5 Series (F10)
- BMW X1 / X3
- Other models using 4- and 6-cylinder petrol turbo engines
If you’re dealing with BMW engine ECU misfire faults and the usual fixes haven’t worked, we can help.
- 8630125 / 8638198 / 7636292 / 7634297 / 8605989 / 8611786 / 8610484 / 8614302 / 7640755
- 0261S07783 / 0261S09073 / 0261S10397 / 0261S11037 / 0261S09472 / 0261S08333 / 0261S09330 / 00261S07665
⚙️ Why Choose ECU Fix?
- ✅ Lifetime warranty on all ECU repairs
- ✅ Fast 24–48 hour turnaround
- ✅ No coding required—just refit and go
- ✅ UK-wide courier collection available
- ✅ No fix, no fee—you only pay collection & return shipping if unrepairable
- ✅ Trusted by independent garages, BMW specialists, and private owners
📦 How to Book Your BMW ECU Misfire Repair
- Click “Shop Now” to start your booking
- Choose UK-wide courier collection or post the ECU to us
- We test and repair the unit within 1–2 working days
- Refit and clear codes—your engine should run smoothly again