Invalid Data from DC-AC Converter 'B'
The U058A code indicates that the vehicle's control module (typically the PCM or hybrid control module) has received invalid, corrupted, or out-of-range data from the DC-AC converter 'B' module via the CAN communication bus. This converter, also known as an inverter, transforms high-voltage DC from the battery into AC to power electrical components or the traction motor in hybrid/electric vehicles. The 'B' designation means there is more than one DC-AC converter in the system or that it is a secondary inverter. The fault lies in the integrity of the transmitted data, not necessarily in the electrical operation of the converter itself.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal failure of the DC-AC converter 'B' control module
- Electromagnetic interference on the CAN bus
- Abnormal resistance (high impedance) in the CAN bus wires
- Corroded or loose connectors in the inverter harness
- Fault in the master control module that interprets the data
- Software version mismatch between control modules
- Water or moisture damage in the converter module
3. Symptoms You Will Notice
- Check Engine Light or hybrid system warning light on
- Reduced performance or limp mode in hybrid/electric operation
4. Step-by-Step Diagnosis
Scan for other related codes and check freeze frame data
Inspect the DC-AC converter 'B' connectors and wiring for corrosion, damage, or looseness
Test CAN bus resistance and voltage at the converter module
Check for electromagnetic interference sources near the CAN bus
Verify software versions of all related modules and update if necessary
Perform a module communication test to isolate the fault
5. Frequently Asked Questions
Is it safe to drive?▼
No, this code indicates a high-severity communication fault that can lead to loss of hybrid/electric functions or unexpected shutdown. It is not safe to drive; have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs vary widely, typically ranging from $200 to $1,500 depending on the root cause. Simple connector repairs may be under $300, while replacing a DC-AC converter module can exceed $1,000.