U0058: Vehicle Communication Bus D (+) Low

Definition

The OBD2 code U0058 indicates a communication issue where the Vehicle Communication Bus D (+) signal is detected as being low, suggesting a potential fault in the communication network between modules in the vehicle

Common causes

Faulty wiring or connectors
Short circuit to ground
Open circuit in the communication bus
Faulty control module
Poor ground connection
Intermittent connection issues
Corroded connectors
Malfunctioning sensors or devices on the bus

Common misdiagnoses

Faulty ABS module
Defective engine control module (ECM)
Malfunctioning transmission control module (TCM)
Bad wiring or connectors
Faulty body control module (BCM)
Issues with the powertrain control module (PCM)
Low battery voltage or charging system problems
Incorrectly diagnosed sensor failures

Troubleshooting steps

1. Check for Other Codes

Start by scanning the vehicle for any other diagnostic trouble codes (DTCs). Sometimes, multiple codes can provide additional context for the issue
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the communication bus. Look for signs of damage, corrosion, or loose connections
4. Pay special attention to the connectors at the modules that communicate over the bus
5. Check for Short Circuits
6. Use a multimeter to check for short circuits in the wiring. Measure the resistance between the communication bus wires and ground to ensure there are no unintended connections
7. Test Voltage Levels
8. With the vehicle in the ON position (engine off), use a multimeter to measure the voltage on the communication bus wire. Compare the readings to the specifications in the vehicle’s service manual
9. If the voltage is low, it may indicate a problem with the bus or the modules connected to it
10. Inspect Modules
11. Check the modules that are connected to the communication bus. A malfunctioning module can cause communication issues. If possible, test the modules individually or replace them with known good units
12. Check for Ground Issues
13. Ensure that all ground connections related to the communication bus are secure and free of corrosion. Poor grounding can lead to communication problems
14. Look for Interference
15. Sometimes, aftermarket accessories or modifications can interfere with the communication bus. If any modifications have been made, consider temporarily removing them to see if the issue resolves
16. Perform a Network Test
17. If available, use a scan tool capable of performing a network test to check the integrity of the communication bus. This can help identify which module may be causing the issue
18. Clear Codes and Test Drive
19. After performing the above checks and repairs, clear the codes and take the vehicle for a test drive to see if the code returns
20. Refer to the vehicle’s service manual for specific troubleshooting steps related to the U0058 code, as different manufacturers may have unique procedures. 1
21. Seek Professional Help
22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with vehicle communication systems. By following these steps, you should be able to identify and resolve the issue related to the U0058 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 associated with the communication bus. Look for signs of damage, corrosion, or loose connections

4. Pay special attention to the connectors at the modules that communicate over the bus

5. Check for Short Circuits

6. Use a multimeter to check for short circuits in the wiring. Measure the resistance between the communication bus wires and ground to ensure there are no unintended connections

7. Test Voltage Levels

8. With the vehicle in the ON position (engine off), use a multimeter to measure the voltage on the communication bus wire. Compare the readings to the specifications in the vehicle’s service manual

9. If the voltage is low, it may indicate a problem with the bus or the modules connected to it

10. Inspect Modules

11. Check the modules that are connected to the communication bus. A malfunctioning module can cause communication issues. If possible, test the modules individually or replace them with known good units

12. Check for Ground Issues

13. Ensure that all ground connections related to the communication bus are secure and free of corrosion. Poor grounding can lead to communication problems

14. Look for Interference

15. Sometimes, aftermarket accessories or modifications can interfere with the communication bus. If any modifications have been made, consider temporarily removing them to see if the issue resolves

16. Perform a Network Test

17. If available, use a scan tool capable of performing a network test to check the integrity of the communication bus. This can help identify which module may be causing the issue

18. Clear Codes and Test Drive

19. After performing the above checks and repairs, clear the codes and take the vehicle for a test drive to see if the code returns

20. Refer to the vehicle’s service manual for specific troubleshooting steps related to the U0058 code, as different manufacturers may have unique procedures. 1

21. Seek Professional Help

22. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with vehicle communication systems. By following these steps, you should be able to identify and resolve the issue related to the U0058 code