U1879 – BMW DTC

BMW DTC U1879 – Drive Motor ‘B’ Control Module Lost Communication With ECM via HL-CAN

DTC U1879 meaning on BMW

DTC U1879 on a BMW indicates that the Drive Motor ‘B’ Control Module has lost communication with the Engine Control Module (ECM) via the High-Speed Controller Area Network (HL-CAN) bus.

BMW DTC U1879 symptoms

Symptoms of DTC U1879 on a BMW may include:

• Check Engine Light (CEL) illuminated
• Loss of power or performance
• Transmission shifting issues
• Vehicle going into limp mode

BMW DTC U1879 causes

Possible causes of DTC U1879 on a BMW include:

• Faulty Drive Motor ‘B’ Control Module
• Communication bus wiring issues
• ECM software or hardware problems
• Interference from other electronic modules

BMW DTC U1879 seriousness

DTC U1879 should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this fault may result in further damage to the vehicle’s systems.

How to diagnose DTC U1879 on BMW

To diagnose DTC U1879 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes
2. Check for any other related fault codes
3. Inspect the wiring and connectors for any visible damage
4. Perform a communication test between the modules
5. Check for any software updates for the modules

How to fix DTC U1879 on BMW

To fix DTC U1879 on a BMW, consider the following:

1. Repair or replace any damaged wiring or connectors
2. Update the software of the affected modules
3. Replace the Drive Motor ‘B’ Control Module if necessary
4. Clear the fault codes and perform a test drive

How to erase DTC U1879 on BMW

To erase DTC U1879 on a BMW, use a diagnostic scanner to clear the fault codes stored in the system. After clearing the codes, perform a test drive to ensure 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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