U3504 – BMW DTC

BMW DTC U3504 – Control Module Input Power ‘B’ Circuit Range/Performance

DTC U3504 meaning on BMW

The DTC U3504 for BMW refers to the Control Module Input Power ‘B’ Circuit Range/Performance. This diagnostic trouble code indicates that there is an issue with the input power circuit ‘B’ of the control module, suggesting a potential problem with the power supply or voltage levels.

BMW DTC U3504 symptoms

Symptoms of the BMW DTC U3504 may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Electrical malfunctions
• Vehicle may go into limp mode

BMW DTC U3504 causes

Possible causes of the BMW DTC U3504 include:

• Faulty control module
• Wiring or connection issues in the power circuit
• Low voltage supply
• Interference or short circuits

BMW DTC U3504 seriousness

The seriousness of the BMW DTC U3504 code lies in the potential impact on the vehicle’s performance and safety. Ignoring this code can lead to further electrical problems, engine issues, or even vehicle stalling. It is recommended to address this code promptly to prevent any potential complications.

How to diagnose DTC U3504 on BMW

To diagnose the DTC U3504 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes
2. Inspect the control module and power circuit for any visible damage or loose connections
3. Check the voltage levels at the control module input power ‘B’ circuit
4. Perform a continuity test on the wiring to identify any open circuits or shorts

How to fix DTC U3504 on BMW

To fix the DTC U3504 on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connections in the power circuit
2. Ensure the control module is functioning correctly or replace if necessary
3. Verify the voltage supply to the control module meets specifications
4. Clear the fault codes and perform a test drive to confirm the issue has been resolved

How to erase DTC U3504 on BMW

To erase the DTC U3504 on a BMW, follow these steps:

1. Use a diagnostic scanner to access the vehicle’s onboard computer system
2. Select the option to clear the fault codes or reset the system
3. Confirm the deletion of the DTC U3504 code
4. Turn off the ignition and restart the vehicle to ensure the code has been successfully erased

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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