DTC U043204 indicates: MMx_TX communication timeout.
What It Means
DTC U043204 indicates: MMx_TX communication timeout. This code is set by the Brake System control module when it detects the condition above. It typically points to an electrical, wiring, or component-level fault rather than a software-only glitch. Technicians should read the freeze-frame data and check the related circuits, connectors, and module supply before replacing parts.
What To Do
Have the vehicle inspected by an authorized service center as soon as possible. Avoid high-load driving and repeated fault occurrences until the issue is diagnosed and resolved.
FAQ
What does DTC U043204 mean?
DTC U043204 indicates: MMx_TX communication timeout. It is logged by the Brake System control module and should be diagnosed before further driving or repair.
Can I keep driving with DTC U043204?
Have the vehicle inspected by an authorized service center as soon as possible. Avoid high-load driving and repeated fault occurrences until the issue is diagnosed and resolved.
Which models does DTC U043204 apply to?
This code applies to the following BYD models: Song. Always confirm the exact configuration against the vehicle VIN and production year.
Technical Info
| Field | Value |
|---|---|
| Code | U043204 |
| Description | MMx_TX communication timeout |
| System | Brake System |
| Source System | IPB |
| Severity | Level 2 — Service Required |
| Applicable Models | Song |
Source: adapted from the dianchema.com BYD fault-code knowledge base. Disclaimer: This material is provided for professional technician reference only. Always follow the official BYD service manual for your specific vehicle. evrepairbase.com is not affiliated with BYD Auto.