What it means
A receiving control module has detected invalid data from DC To AC Converter Control Module B. The code does not specify which data is invalid or why.
How it works
DC To AC Converter Control Module B manages the second identified converter unit, separate from converter A, and reports its status to other modules. U058A is set when a receiving module rejects converter B's data as invalid; it does not identify the bad value or prove converter B itself has failed.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save freeze-frame and communication codes, checking whether the fault is isolated to converter B or accompanied by converter A or network codes.
- Review live data specifically for converter B's reported status and compare it with any affected powered equipment and the conditions when the code set.
- Inspect converter B's connectors and harness for looseness, corrosion, moisture, heat damage, or chafing.
- Check converter B's power, ground, and network circuits against the wiring diagram and manufacturer's specification, observing high-voltage precautions.
- If circuits pass, verify converter B's software and configuration and test gateway routing and module data using the manufacturer's procedure.
Common fixes
- Secure or clean a loose or corroded converter B connector.
- Repair damaged power, ground, or network wiring specifically to converter B.
- Correct converter B software or configuration if a replacement or update caused a mismatch.
- Replace DC To AC Converter Control Module B if testing confirms it continues to send invalid data.
- Repair the gateway only if testing confirms it is mishandling converter B messages.
Can I keep driving?
Avoid relying on equipment served by converter B while its status is unreliable. If the vehicle displays a high-voltage warning or loses power, stop safely and arrange qualified diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.