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U3509 – BMW DTC

BMW DTC U3509 – Control Module Input Power ‘C’ Circuit Low

DTC U3509 meaning on BMW

DTC U3509 on a BMW refers to the Control Module Input Power ‘C’ Circuit Low. This diagnostic trouble code indicates that the power input to a specific control module in the vehicle is lower than the expected threshold.

BMW DTC U3509 symptoms

Symptoms of DTC U3509 on a BMW may include:

  • Check Engine Light (MIL) illuminated
  • Reduced engine performance
  • Electrical malfunctions

BMW DTC U3509 causes

Common causes of DTC U3509 on a BMW include:

  • Wiring or connection issues in the power supply circuit
  • Defective control module
  • Faulty power supply relay

BMW DTC U3509 seriousness

The seriousness of DTC U3509 on a BMW depends on the underlying cause. Ignoring this fault can lead to further electrical problems and potential vehicle performance issues. It is recommended to address this DTC promptly.

How to diagnose DTC U3509 on BMW

To diagnose DTC U3509 on a BMW, follow these steps:

  1. Use a diagnostic scanner to retrieve the fault codes.
  2. Inspect the power supply circuit for any visible damage or loose connections.
  3. Check the control module and power supply relay for proper functionality.

How to fix DTC U3509 on BMW

To fix DTC U3509 on a BMW, consider the following:

  1. Repair any damaged wiring or connections in the power supply circuit.
  2. Replace the faulty control module if necessary.
  3. If the power supply relay is defective, replace it with a new one.

How to erase DTC U3509 on BMW

To erase DTC U3509 on a BMW:

  1. Use a diagnostic scanner to clear the fault codes.
  2. After fixing the underlying issue, perform a test drive to ensure the fault does not reoccur.

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

← All BMW Diagnostic Trouble Codes

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