U0090 – BMW DTC

BMW DTC U0090 – Vehicle Communication Bus G (-) High

DTC U0090 meaning on BMW

The DTC U0090 code for BMW refers to a communication bus fault, specifically indicating a high voltage condition on the Vehicle Communication Bus G (-). This fault typically occurs when there is a communication issue within the vehicle’s network, affecting the flow of data between various control modules.

BMW DTC U0090 symptoms

Symptoms of the BMW DTC U0090 code may include:

• Check Engine Light (MIL) illuminated
• Loss of communication with certain vehicle systems
• Erratic behavior of electronic components

BMW DTC U0090 causes

Common causes of the BMW DTC U0090 code include:

• Faulty wiring or connectors in the communication bus network
• Defective control modules or sensors
• Interference from aftermarket electronic installations

BMW DTC U0090 seriousness

The DTC U0090 code should be addressed promptly as it can lead to communication breakdowns between critical vehicle systems. Ignoring this fault may result in performance issues, safety concerns, or further damage to electronic components.

How to diagnose DTC U0090 on BMW

To diagnose the DTC U0090 code on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s system.
2. Inspect the wiring and connectors related to the Vehicle Communication Bus G (-) for any signs of damage or corrosion.
3. Check for loose connections or poor grounds in the communication network.
4. Perform a thorough visual inspection of control modules and sensors that may be affecting communication.

How to fix DTC U0090 on BMW

To fix the DTC U0090 code on a BMW, consider the following:

1. Repair or replace any damaged wiring or connectors in the communication bus network.
2. Address any faulty control modules or sensors that are impeding communication.
3. Remove any aftermarket electronic installations that may be causing interference.
4. Clear the fault codes using a diagnostic scanner after completing the repairs.

How to erase DTC U0090 on BMW

To erase the DTC U0090 code on a BMW:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port.
2. Access the scanner’s menu to clear the fault codes stored in the system.
3. Follow the on-screen prompts to erase the DTC U0090 code.
4. Verify that the code has been successfully cleared by rescanning the system.

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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