U1820 – Audio System Communication Failure
The ODBII code U1820: Audio System Communication Failure indicates a communication issue between the audio system and other modules in the vehicle, suggesting that the audio system is not properly communicating with the network.
The severity of ODBII code U1820 is generally considered moderate.
Common Causes For: U1819 refers to a communication issue related to the transmission control module (TCM) in a vehicle.
- Faulty audio system module
- Damaged wiring or connectors
- Poor ground connection
- Malfunctioning CAN bus
- Software issues or firmware corruption
- Interference from aftermarket audio equipment
- Faulty or disconnected communication lines
Common misdiagnosis for U1820 U1820: Audio System Communication Failure
- Faulty audio system components
- Wiring issues unrelated to the audio system
- Battery or power supply problems
- Faulty control modules
- Software or firmware issues in the audio system
- Incorrectly diagnosed speaker problems
- Issues with other communication networks in the vehicle
- Grounding issues unrelated to the audio system
Common Troubleshooting Steps
The OBD-II code U1820 indicates an “Audio System Communication Failure.” This code typically points to a problem with the communication between the audio system and other modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve the issue:
- Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue.
- Inspect Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the audio system for any signs of damage, corrosion, or loose connections.
- **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
- Check the Audio System: **Power Supply: Verify that the audio system is receiving power. Check fuses related to the audio system.
- **Ground Connections: Ensure that the ground connections for the audio system are secure and free of corrosion.
- Test the Audio System: If possible, test the audio system itself to ensure it is functioning correctly. This may involve checking the head unit, speakers, and any amplifiers.
- Inspect Other Modules: Since the audio system communicates with other modules (like the body control module or infotainment system), check these modules for any faults or communication issues.
- Perform a Network Scan: Use a professional-grade scan tool to perform a network scan of the vehicle’s communication network. This can help identify if other modules are having communication issues.
- Reset the System: Clear the trouble codes using the OBD-II scanner and see if the code returns after a short drive. Sometimes, a reset can resolve temporary communication issues.
- Software Updates: Check if there are any software updates available for the audio system or other related modules. Sometimes, manufacturers release updates to fix communication issues.
- Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the audio system or communication issues for your specific vehicle make and model. Manufacturers may have documented solutions for known issues.
- Professional Diagnosis: If the issue persists after performing the above steps, consider taking the vehicle to a qualified technician or dealership for a more in-depth diagnosis.Conclusion Troubleshooting OBD-II code U1820 involves a systematic approach to check for wiring issues, module communication, and the functionality of the audio system itself. Following these steps can help identify and resolve the underlying problem.