BMW DTC P0249 – Turbocharger/Supercharger Wastegate Actuator ‘B’ Low
DTC P0249 meaning on BMW
DTC P0249 indicates that the Engine Control Module (ECM) has detected a low voltage condition in the turbocharger/supercharger wastegate actuator ‘B’. This means that the wastegate actuator is not functioning properly, which can lead to issues with turbocharger boost control.
BMW DTC P0249 symptoms
Symptoms of DTC P0249 on a BMW may include:
- Reduced engine power
- Lack of turbocharger boost
- Check Engine Light (CEL) illuminated
- Decreased fuel efficiency
BMW DTC P0249 causes
Common causes of DTC P0249 on a BMW include:
- Wastegate actuator failure
- Wiring or connector issues in the wastegate actuator circuit
- ECM software or hardware problems
BMW DTC P0249 seriousness
DTC P0249 should be addressed promptly as it can lead to reduced engine performance and potential long-term damage to the turbocharger system. Ignoring this code may result in further engine issues and increased repair costs.
How to diagnose DTC P0249 on BMW
To diagnose DTC P0249 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the wastegate actuator and its wiring for any visible damage or corrosion
- Test the wastegate actuator for proper operation using a multimeter
- Check the wastegate actuator vacuum lines for leaks or blockages
How to fix DTC P0249 on BMW
To fix DTC P0249 on a BMW, you can try the following solutions:
- Replace the wastegate actuator if it is faulty
- Repair any damaged wiring or connectors in the wastegate actuator circuit
- Update the ECM software to the latest version
- Ensure proper vacuum supply to the wastegate actuator
How to erase DTC P0249 on BMW
To erase DTC P0249 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM’s memory. After addressing the underlying issue causing the code, clearing the code will reset the Check Engine Light and monitor the system for any recurring faults.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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