BMW 3 Series Misfire Caused by Faulty Engine ECU
Engine misfires are a prevalent issue in the E90 range equipped with this engine ECU. The symptoms include rough running, progressive misfires over one or more cylinders, and potential difficulty in starting. Scan tools will reveal fault codes related to injector circuit failure and combustion misfire, along with missing injector signals from the ECU. If left unattended, the faulty ECU can eventually lead to the BMW E90 not starting and may hinder communication with the engine management system.
Opting for a replacement ECU is costly, requiring additional expenses for coding and providing only a short one-year warranty. Our BMW ECU repair service addresses these issues at a fraction of the cost of a replacement. We retain the original coding, eliminating the need for expensive recoding. The engine ECU can be tested, rebuilt, and returned within 2-3 working days, backed by an unlimited mile lifetime warranty.
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Common Failure Symptoms
- Engine misfire
- No injector signal
- Rough running
- No start
- Illuminated engine management light
Common Fault Codes
- 30BA – Injector Circuit Failure 1-3 or DME Internal Fault
- 30BB – Injector Circuit Failure 4-6 or DME Internal Fault
- 29CE – Combustion Failure Cylinder 2
- 29CF – Combustion Failure Cylinder 3
- 29D0 – Combustion Failure Cylinder 4
- 29D2 – Combustion Failure Cylinder 6
- 29CC – Combustion Misfire On Several Cylinders
Part Numbers
Test and Rebuild
- Each engine management ECU undergoes comprehensive testing on bespoke HIL test rigs, replicating real-world load and driving conditions to ensure performance surpasses OEM specifications.
Programming
- Retains original programming during the test and rebuild process, eliminating the need for recoding.
Quality
- Adheres to high lifetime warranty standards, including quality control, ESD safety, testing, and workmanship.
Warranty
- Lifetime unlimited mileage warranty.
How to Get Your Unit Rebuilt?
- Select your part number and click “Get your repaired.”
- Print the payment/booking confirmation email.
- Package the engine ECU securely with the confirmation email.
- Send the package via tracked courier.
- Upon receipt, the ECU will be tested, rebuilt, and returned with an unlimited mileage lifetime warranty.