BMW DTC U01B3 – Lost Communication With Brake Blending Actuator
DTC U01B3 meaning on BMW
DTC U01B3 on a BMW indicates a communication error with the Brake Blending Actuator. This fault code is triggered when the vehicle’s control module is unable to establish communication with the brake blending actuator, which is responsible for blending regenerative braking with traditional hydraulic braking.
BMW DTC U01B3 symptoms
Symptoms of DTC U01B3 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Loss of regenerative braking functionality
- Decreased braking performance
BMW DTC U01B3 causes
The common causes of DTC U01B3 on a BMW are:
- Faulty brake blending actuator
- Wiring or connection issues between the control module and the brake blending actuator
- Software glitches in the control module
BMW DTC U01B3 seriousness
The seriousness of DTC U01B3 on a BMW depends on the extent of the communication failure. Ignoring this fault code can lead to compromised braking performance and safety issues. It is recommended to address this issue promptly to ensure the proper functioning of the braking system.
How to diagnose DTC U01B3 on BMW
To diagnose DTC U01B3 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s control module
- Inspect the wiring and connections between the control module and the brake blending actuator for any visible damage or corrosion
- Test the brake blending actuator for proper functionality
- Check for any software updates or reprogramming needed for the control module
How to fix DTC U01B3 on BMW
To fix DTC U01B3 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connections between the control module and the brake blending actuator
- Replace the faulty brake blending actuator if necessary
- Perform any software updates or reprogramming required for the control module
How to erase DTC U01B3 on BMW
To erase DTC U01B3 on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the vehicle’s control module. After addressing the underlying issue causing the fault code, the mechanic can then reset the system to ensure the fault code does not reappear.
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.