What it means
A receiving control module has detected invalid data from AC To DC Converter Control Module A. The code does not specify which data is invalid or why.
How it works
AC to DC Converter Control Module A manages converter operation that supplies direct-current power from an alternating-current source in vehicles equipped with this system. U0597 sets when another module rejects data from converter controller A as invalid; it does not specify which reading 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 charging, converter, and communication codes to establish which module reported U0597.
- Check the low-voltage battery and charging system for unstable supply that could affect controller A’s data.
- Inspect controller A’s accessible connectors and low-voltage harness for corrosion, damage, loose terminals, or signs of repair.
- Use a scan tool to compare controller A’s status and reported converter values with related charging-system data.
- Check gateway and network codes, then test controller A’s power, ground, and communication circuits to the manufacturer’s specification.
- If controller A or a related module was replaced, confirm software compatibility and vehicle configuration before condemning it.
Common fixes
- Repair damaged, loose, or corroded low-voltage wiring at AC to DC converter control module A.
- Correct a weak low-voltage battery or charging-system problem.
- Install the correct software or configuration if a mismatch is confirmed.
- Repair a gateway or communication fault if network tests identify one.
- Replace converter control module A only when testing confirms an internal fault.
Can I keep driving?
If a charging or electrical warning is present, avoid relying on the affected charging function and follow the vehicle’s instructions. Stop if power is limited or operation becomes unpredictable; do not work on high-voltage converter wiring.
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.