U1132 – BMW DTC

BMW DTC U1132 – Lost Communication With Generator via BSD (Bit Serial Data Interface)

DTC U1132 meaning on BMW

DTC U1132 on a BMW indicates a communication error with the generator via the Bit Serial Data (BSD) interface. This diagnostic trouble code (DTC) is specific to the communication system between the vehicle’s control modules and the generator, which is responsible for charging the vehicle’s battery and providing electrical power to the vehicle’s systems.

BMW DTC U1132 symptoms

Symptoms of DTC U1132 on a BMW may include:

• Malfunction indicator light (MIL) or check engine light illuminated on the dashboard
• Battery warning light illuminated on the dashboard
• Issues with the vehicle’s electrical system, such as dimming lights or erratic behavior

BMW DTC U1132 causes

Possible causes of DTC U1132 on a BMW include:

• Faulty generator
• Issues with the BSD communication network
• Faulty wiring or connectors in the communication circuit
• Faulty control module

BMW DTC U1132 seriousness

DTC U1132 should be addressed promptly as it can lead to charging system malfunctions, potentially resulting in a dead battery and vehicle stalling. Ignoring this DTC can lead to further electrical system issues and potential vehicle breakdowns.

How to diagnose DTC U1132 on BMW

To diagnose DTC U1132 on a BMW, a diagnostic scan tool capable of reading BMW-specific codes is required. The following steps can be taken:

1. Retrieve the DTC using a diagnostic scan tool
2. Check the generator for proper operation
3. Inspect the BSD communication network for faults
4. Check wiring and connectors for any damage or corrosion
5. Test the control modules involved in the communication

How to fix DTC U1132 on BMW

To fix DTC U1132 on a BMW, the following steps can be taken:

1. Repair or replace the faulty generator if necessary
2. Repair any issues with the BSD communication network
3. Repair or replace any damaged wiring or connectors in the communication circuit
4. Replace any faulty control modules

How to erase DTC U1132 on BMW

After fixing the underlying issue causing DTC U1132 on a BMW, the code can be cleared using a diagnostic scan tool. Follow these steps:

1. Connect the scan tool to the vehicle’s OBD-II port
2. Navigate to the DTC menu and select to clear the code
3. Follow the on-screen prompts to erase the DTC
4. Verify that the code has been successfully cleared

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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