U1579: Invalid Data Received from Vehicle Communication Bus

Definition

The OBD2 code U1579 indicates that the vehicle's communication bus has received invalid data, suggesting a problem with data transmission between modules

Common causes

Faulty wiring or connectors in the communication bus
Malfunctioning control modules
Corrupted or incompatible software in the control modules
Poor ground connections
Interference from aftermarket devices or modifications
Low battery voltage or power supply issues
Faulty or damaged OBD-II port

Common misdiagnoses

Faulty OBDII connector
Bad ground connections
Malfunctioning ECU
Wiring issues
Faulty sensors
Communication module failure
Software glitches in the vehicle's systems
Incorrectly configured aftermarket devices

Troubleshooting steps

1. Check for Other Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors related to the communication bus (CAN bus). Look for signs of damage, corrosion, or loose connections
4. Pay special attention to the connectors of the modules involved in the communication
5. Check for Short Circuits or Open Circuits
6. Use a multimeter to check for continuity in the communication lines. Look for any short circuits or open circuits that could be affecting communication
7. Verify Module Functionality
8. Ensure that all modules on the communication bus are functioning correctly. If a specific module is malfunctioning, it may send invalid data
9. If possible, perform a module reset or reprogramming if the module supports it
10. Inspect the CAN Bus
11. Use an oscilloscope or a CAN bus analyzer to monitor the data on the CAN bus. Look for irregularities in the signal, such as noise or incorrect voltage levels
12. Check the termination resistors at both ends of the CAN bus to ensure they are present and functioning correctly
13. Check for Software Updates
14. Verify if there are any software updates available for the vehicle's modules. Sometimes, manufacturers release updates to fix communication issues
15. Battery and Ground Connections
16. Ensure that the vehicle's battery is in good condition and that all ground connections are secure. Poor power supply or grounding can lead to communication issues
17. Clear Codes and Test Drive
18. After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns
19. Consult Technical Service Bulletins (TSBs)
20. Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented solutions for known issues
21. Professional Diagnosis
22. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1579 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Other Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors related to the communication bus (CAN bus). Look for signs of damage, corrosion, or loose connections

4. Pay special attention to the connectors of the modules involved in the communication

5. Check for Short Circuits or Open Circuits

6. Use a multimeter to check for continuity in the communication lines. Look for any short circuits or open circuits that could be affecting communication

7. Verify Module Functionality

8. Ensure that all modules on the communication bus are functioning correctly. If a specific module is malfunctioning, it may send invalid data

9. If possible, perform a module reset or reprogramming if the module supports it

10. Inspect the CAN Bus

11. Use an oscilloscope or a CAN bus analyzer to monitor the data on the CAN bus. Look for irregularities in the signal, such as noise or incorrect voltage levels

12. Check the termination resistors at both ends of the CAN bus to ensure they are present and functioning correctly

13. Check for Software Updates

14. Verify if there are any software updates available for the vehicle's modules. Sometimes, manufacturers release updates to fix communication issues

15. Battery and Ground Connections

16. Ensure that the vehicle's battery is in good condition and that all ground connections are secure. Poor power supply or grounding can lead to communication issues

17. Clear Codes and Test Drive

18. After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns

19. Consult Technical Service Bulletins (TSBs)

20. Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented solutions for known issues

21. Professional Diagnosis

22. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1579 code