• Steering performance issues
• Warning lights on the dashboard
• Loss of advanced steering features
• Faulty Active Steering Control Module
• Wiring issues or poor connections
• Faulty ECM or network communication problems
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• U0100
• U0121
This code means that the car's computer is having trouble talking to one of the parts that helps control the car's speed and direction.
The vehicle's communication network has lost communication with the Active Steering Control Module.
OBD-II Code U0645 indicates a lost communication with the Active Steering Control Module. This means that the main computer (ECM) is not receiving information from this module, which can affect the vehicle's steering performance.
• Check for other codes and address them first.
• Inspect wiring and connectors to the Active Steering Control Module.
• Test the Active Steering Control Module for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the Active Steering Control Module if faulty.
• Reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Repair manual
$200 - $800
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regularly check and maintain vehicle wiring.
• Ensure all software updates are performed.
• Avoid harsh driving conditions that might affect the steering system.
Communication Error
• Have the vehicle inspected by a professional if you notice steering issues.
• Do not ignore warning lights on the dashboard.
• Keep up with regular vehicle maintenance.
Check with the vehicle manufacturer for warranty coverage on electronic components.
This code has become more common as vehicles incorporate more electronic control systems for steering.
Moderate – It is important to address this issue to ensure safe vehicle operation.
Driving with this issue can compromise vehicle safety. It is recommended to have it checked by a professional.
• Vehicle must be running.
• Steering system should be engaged.
The Active Steering Control Module is typically located near the steering column or integrated within the steering rack.
Q: Can I drive with a U0645 code?
A: It's not recommended to drive with this code active, as it can affect steering performance and safety.
Q: How do I reset the U0645 code?
A: After repairs, you can reset the code with an OBD-II scanner, but ensure the issue is fixed to prevent it from returning.
