When it comes to Honda vehicles with code U0029, it’s essential to understand the meaning of the code and the causes and solutions associated with it. This code refers to an “F-CAN A Malfunction (BUS-OFF (PCM))” wherein the PCM does not receive any signals via the F-CAN A lines for at least 1 second. When a malfunction is detected, the D indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. This can be caused by a variety of factors, including a check battery and charging system condition, loose or poor connections, or worn/shorted wires. Additionally, the F-CAN wires may be “short,” the gauge control module may be faulty, the PCM may need to be updated with the latest software, and the PCM may be faulty. Fortunately, there are solutions to these potential issues, and understanding the cause is the first step.
💥See also: Honda Code P0507
Causes and Solutions for Honda Code U0029
| Cause | Solution |
|---|---|
| Check battery and charging system condition | Ensure the battery and charging system are functioning correctly. |
| Loose or poor connections or worn/shorted wires | Check all connections, wires, and wiring harnesses. |
| “Short” in the F-CAN wires | Inspect all F-CAN wires for any signs of damage. |
| Faulty gauge control module | Replace the gauge control module if necessary. |
| PCM may need to be updated with the latest software | Update the PCM with the latest software. |
| Faulty PCM | Replace the PCM if necessary. |
Checking Battery and Charging System Condition
When Honda code U0029 is encountered, one of the first steps of troubleshooting should be to check the battery and charging system condition. This means ensuring that the battery is functioning properly and that the charging system is working correctly. If the charging system is not working correctly, it can cause a variety of issues, including the Honda code U0029.
Inspecting Connections, Wires, and Wiring Harnesses
It is also important to inspect all connections, wires, and wiring harnesses when troubleshooting Honda code U0029. This includes looking for any loose or poor connections and any worn or shorted wires. If any of these are found, they should be fixed or replaced as soon as possible.
Inspecting F-CAN Wires for Damage
When troubleshooting Honda code U0029, inspecting all F-CAN wires for any signs of damage is essential. If the F-CAN wires are “short”, this can cause the code to be triggered. If any damage is found, the wires should be fixed or replaced as soon as possible.
Replacing Gauge Control Module or PCM
Finally, if the above steps do not resolve the issue, the gauge control module or PCM may need to be replaced. If the gauge control module is faulty, it should be replaced with a new one. If the PCM needs to be updated with the latest software, this should be done as soon as possible. If the PCM is faulty, it should be replaced with a new one.
Conclusion
Understanding the cause and solutions associated with Honda code U0029 is the first step in troubleshooting the issue. This code refers to an “F-CAN A Malfunction (BUS-OFF (PCM))” wherein the PCM does not receive any signals via the F-CAN A lines for at least 1 second. To resolve the issue, it is essential to check the battery and charging system condition, inspect all connections, wires, and wiring harnesses, inspect all F-CAN wires for any signs of damage, and replace the gauge control module or PCM if necessary. The issue can be resolved quickly and efficiently with the proper knowledge and understanding of Honda code U0029.