What it means
A receiving control module has detected invalid data from AC To DC Converter Control Module B. The code does not specify which data is invalid or why.
How it works
AC to DC Converter Control Module B manages a separate converter channel or unit where the vehicle is equipped with one, supplying direct-current power from an alternating-current source. U0598 sets when a receiving module considers data from controller B invalid; it does not reveal the bad value or prove the converter 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 retain freeze-frame plus charging, converter, and communication codes to identify the reporting module and related faults.
- Check low-voltage battery and charging condition before testing controller B, since unstable supply can corrupt module operation.
- Inspect converter control module B’s accessible connectors and low-voltage wiring for damage, moisture, loose pins, or previous repair.
- Compare controller B status and reported converter data with related system readings using a capable scan tool.
- Check network and gateway codes, then test controller B’s power, ground, and communication circuits to the manufacturer’s specification.
- If controller B or a related module was replaced or updated, verify its software and configuration for this vehicle.
Common fixes
- Repair loose, corroded, or damaged low-voltage wiring serving converter control module B.
- Resolve a low-voltage battery or charging fault affecting module data.
- Correct a confirmed software or vehicle-configuration mismatch.
- Repair a gateway or network fault if testing traces invalid data to communication routing.
- Replace AC to DC converter control module B only after circuit and configuration checks confirm an internal fault.
Can I keep driving?
If a converter or charging warning appears, avoid depending on the affected charging function and follow the vehicle’s guidance. Stop if the vehicle limits power or behaves unpredictably, and keep clear of high-voltage components.
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.