BMW DTC U1122 – Lost Communication With Power Management Charge Voltage
DTC U1122 meaning on BMW
DTC U1122 on a BMW indicates a communication error with the Power Management Charge Voltage system. This fault code is triggered when the vehicle’s control module is unable to communicate with the power management system to monitor and regulate the charge voltage effectively.
BMW DTC U1122 symptoms
Symptoms of DTC U1122 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Issues with battery charging
- Erratic behavior of electrical components
- Reduced fuel efficiency
BMW DTC U1122 causes
Common causes of DTC U1122 on a BMW include:
- Faulty power management control module
- Wiring or connection issues in the power management system
- Defective battery or alternator
- Software glitches in the vehicle’s control module
BMW DTC U1122 seriousness
DTC U1122 should not be ignored as it can lead to potential issues with the vehicle’s electrical system and charging capabilities. Ignoring this fault code may result in battery drain, starting problems, and other electrical malfunctions.
How to diagnose DTC U1122 on BMW
To diagnose DTC U1122 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the power management system components for any visible damage or loose connections
- Test the battery and alternator to ensure they are functioning correctly
- Check for any software updates or reprogramming needed for the control module
How to fix DTC U1122 on BMW
To fix DTC U1122 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connections in the power management system
- Replace the faulty power management control module if necessary
- Test and replace the battery or alternator if they are found to be defective
- Update the software in the control module to the latest version
How to erase DTC U1122 on BMW
To erase DTC U1122 on a BMW, the fault code can be cleared using a diagnostic scanner. After addressing the underlying issue causing the fault code, the scanner can be used to reset the code and clear the Check Engine Light from the dashboard.
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.