Call 24/7: 07779 836677 / 07448 457247
⚠️
ECU Control Fault:
Fault codes 30BA and 30BB indicate a malfunction within the BMW DME (engine control unit). These are not sensor faults and will not be resolved by clearing codes.
What Do BMW Fault Codes 30BA & 30BB Mean?
On BMW vehicles, fault codes 30BA and 30BB are logged when the DME (Digital Motor Electronics) detects an internal control, monitoring, or processing fault. The ECU is unable to reliably manage engine functions within its expected parameters.
Common BMW Models Affected
- BMW 1 Series, 3 Series, 5 Series
- BMW X1, X3, X5
- Petrol and diesel BMW engines
- Vehicles with MSD / MEVD / MG-series DMEs
Common Causes
- Internal DME processor or memory failure
- Voltage spikes or low-voltage events
- Water ingress into the ECU housing
- Failed or interrupted software updates
- Internal power supply circuit faults
Typical Symptoms
- Engine warning light illuminated
- Limp mode or reduced engine power
- Intermittent non-start or stalling
- Multiple unrelated fault codes stored
- 30BA / 30BB return immediately after clearing
Our BMW DME Repair Solution
BMW dealers often recommend complete ECU replacement followed by coding and alignment. We carry out proper DME-level diagnostics: internal power checks, memory validation, software integrity testing, and bench testing where required. In many cases, the original ECU can be repaired and refitted.