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DTC codes / U05xx · Network communication / U058A

U058AInvalid Data Received From DC/AC Converter Control Module B

The U058A code means the module that supervises the vehicle's communication network has received invalid or corrupted data from the DC/AC converter control module B, which is the electronic unit that manages a high-voltage DC-to-AC inverter. The supervising module detected that the data frames from this converter module did not match the expected format, checksum, or signal range, so it flagged the message as invalid rather than trusting it.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaNetwork communication

Symptoms you may notice

  • Illumination of the check engine light or a dedicated hybrid/EV system warning lamp, often with no other noticeable symptoms.
  • The high-voltage DC/AC converter may shut down, causing loss of 120-volt AC accessory power or a reduction in available electrical output.
  • A message on the driver information display indicating a fault with the power outlet, inverter, or high-voltage system.
  • Possible reduced vehicle performance or forced limp mode if the converter module is part of a hybrid or electric drivetrain.
  • Intermittent operation of accessories that rely on the converter, such as AC power outlets or onboard equipment.
  • In some cases, the vehicle may fail to start or enter a ready-to-drive state if the converter module is critical to the power-up sequence.

Common causes, most likely first

  1. A weak or failing 12-volt battery that causes voltage sags and corrupts data on the communication bus.
  2. Corroded, loose, or damaged wiring and connectors at the DC/AC converter control module B or along its network bus.
  3. A faulty DC/AC converter control module B that is internally failing and transmitting invalid data frames.
  4. Water intrusion or physical damage to the converter module or its harness, common in underbody or cargo-area installations.
  5. A software or calibration issue in the converter module that requires a reflash or update.
  6. A problem with the communication network itself, such as a shorted or open data line, that distorts messages from the converter module.
  7. Another module on the same network intermittently disrupting communication, which can cause the supervising module to misattribute invalid data to the converter.

How to diagnose and fix it

  1. Perform a full battery and charging system test, including a load test, and replace the 12-volt battery if it is weak or out of specification.
  2. Inspect and clean the connectors and harness at the DC/AC converter control module B, looking for corrosion, loose pins, chafed wires, or water intrusion.
  3. Clear the code and road-test the vehicle to see if U058A returns, which helps distinguish an intermittent fault from a hard failure.
  4. Use a scan tool to check for related communication codes and to view live data from the converter module, confirming whether it is communicating at all.
  5. Check for technical service bulletins or software updates for the converter module and the supervising module, and reflash if an update is available.
  6. If wiring and power supply are good, substitute a known-good DC/AC converter control module B or perform a module swap to confirm the fault follows the module.
  7. After repair, clear all codes and verify that U058A does not reset during a complete drive cycle, including operation of the converter under load.

What the invalid data code really tells you

  • U058A is a communication code, not a direct converter failure code, so the converter module may still be functioning while its data messages are being corrupted by a voltage or wiring issue.
  • A weak 12-volt battery is one of the most common root causes of invalid data codes on modern vehicles, because low voltage during cranking or load changes can distort network messages.
  • Technicians often replace the converter module only to find the code returns, because the real fault was a corroded ground or a damaged data line that was overlooked.
  • The code can be set by another module on the same network intermittently shorting the bus, which makes the converter's messages appear invalid even though the converter itself is healthy.
  • On hybrid and electric vehicles, the DC/AC converter control module B may be part of the high-voltage system, so diagnosis requires high-voltage safety precautions and may not be a DIY job.

Can I keep driving with U058A?

The vehicle is generally safe to drive to a repair shop if the only symptom is a warning light and the converter is not critical to drivetrain operation, but avoid using high-voltage AC accessories and do not ignore the code if the vehicle enters limp mode or shows a high-voltage warning. If the vehicle fails to start or the converter module is part of the hybrid drive system, have it towed rather than driven.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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