U1820 – BMW DTC

BMW DTC U1820 – Hybrid/EV Powertrain Control Module Lost Communication With SBA (Sensotronic Brake Actuation) via HS-CAN

DTC U1820 meaning on BMW

The Diagnostic Trouble Code (DTC) U1820 on a BMW indicates that there is a communication error between the Hybrid/EV Powertrain Control Module and the Sensotronic Brake Actuation (SBA) system via the High-Speed Controller Area Network (HS-CAN) bus.

BMW DTC U1820 symptoms

Symptoms of the DTC U1820 on a BMW may include:

• Malfunction indicator light (MIL) or check engine light illuminated on the dashboard
• Loss of communication with the SBA system
• Braking system warning lights
• Reduced braking performance

BMW DTC U1820 causes

Possible causes of the DTC U1820 on a BMW include:

• Faulty Hybrid/EV Powertrain Control Module
• Faulty Sensotronic Brake Actuation system
• Wiring or connection issues between the modules
• Software or programming issues

BMW DTC U1820 seriousness

The DTC U1820 should be addressed promptly as it relates to the communication between critical systems in the vehicle, specifically the powertrain and braking system. Ignoring this code could lead to potential safety hazards and compromised vehicle performance.

How to diagnose DTC U1820 on BMW

To diagnose the DTC U1820 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes and identify the U1820 code
2. Inspect the wiring and connections between the Hybrid/EV Powertrain Control Module and the SBA system
3. Check for any visible damage or corrosion in the wiring harness
4. Perform a communication test between the modules to verify the issue

How to fix DTC U1820 on BMW

To fix the DTC U1820 on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connectors between the modules
2. Update the software or programming of the Hybrid/EV Powertrain Control Module and SBA system
3. Reset the fault codes and perform a test drive to ensure the issue is resolved

How to erase DTC U1820 on BMW

To erase the DTC U1820 on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. Once the codes are cleared, the mechanic should verify that the issue has been resolved by performing a test drive and checking for any reoccurrence of the fault code.

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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.