BMW DTC U1844 – Universal Charger Extension Control Module Lost Communication With Drive Motor ‘B’ Control Module
DTC U1844 meaning on BMW
DTC U1844 on a BMW indicates that the Universal Charger Extension Control Module has lost communication with the Drive Motor ‘B’ Control Module. This communication error can disrupt the proper functioning of the charging system and motor control.
BMW DTC U1844 symptoms
Symptoms of DTC U1844 on a BMW may include:
- Charging system malfunctions
- Reduced electric motor performance
- Warning lights on the dashboard
BMW DTC U1844 causes
Possible causes of DTC U1844 on a BMW include:
- Faulty Universal Charger Extension Control Module
- Faulty Drive Motor ‘B’ Control Module
- Wiring or connection issues
BMW DTC U1844 seriousness
The seriousness of DTC U1844 on a BMW depends on the extent of the communication loss between the modules. Ignoring this issue can lead to further electrical system problems and potential drivability issues.
How to diagnose DTC U1844 on BMW
To diagnose DTC U1844 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connections between the Universal Charger Extension Control Module and Drive Motor ‘B’ Control Module
- Check the modules for any visible damage or signs of malfunction
How to fix DTC U1844 on BMW
To fix DTC U1844 on a BMW, you may need to:
- Replace the faulty Universal Charger Extension Control Module or Drive Motor ‘B’ Control Module
- Repair any damaged wiring or connections
- Clear the fault codes and reset the system
How to erase DTC U1844 on BMW
To erase DTC U1844 on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- Ensure that the communication between the modules is restored
- Perform a test drive to confirm that the issue has been resolved
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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