U058A

Code

Generic U — Network/User

Invalid Data Received From DC/AC Converter Control Module B

Brand: Generic

Type: U — Network/User

Views: UK: 26 EN: 23 RU: 25

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Page language: EN

Causes

Corrupted or malformed CAN/serial messages from DC/AC Converter Control Module B
Power supply or ground fault at the converter control module
Damaged wiring, poor connector contact, or water intrusion on harness to module B
Bus termination, wiring short or high electrical noise on CAN/communication lines
Software mismatch, firmware bug, or incomplete module reflash
Intermittent module fault or internal controller failure

Symptoms

Malfunction Indicator Lamp (MIL) or warning message related to inverter/drive system
Reduced drive power, limp-home mode, or limited vehicle performance
Inability to charge, start electric drive, or unpredictable inverter behavior
Erratic or missing status data from converter B on a scan tool
Multiple communication-related U-codes present

What to check

Read and record all stored DTCs and freeze-frame data with a capable scan tool
Check for other module faults (powertrain, gateway, battery management) that may affect communications
Verify ability to communicate with Converter Control Module B using a scanner (explicit data and diagnostic responses)
Visually inspect connectors, seals and wiring for damage, corrosion, pin push-out or water intrusion
Measure module supply voltage and ground integrity at the module connector (with key/off and key-on as required)
Monitor CAN/communication bus activity and idle voltages with a multimeter; use an oscilloscope to confirm message waveforms and termination

Signal parameters

CAN message ID(s) from Converter Control Module B and expected frequency (e.g., periodic status messages 5–100 Hz depending on signal)
Expected CAN bus recessive and dominant voltages (approx. 2.5 V idle per node, differential ~0 V/2.5 V depending on system) — verify per vehicle spec
Typical module supply voltage range (e.g., 9–16 V on vehicle 12 V systems) and stable ground
Common status/data fields: converter output current, output voltage, temperature, state-of-charge/status bits — values must be within manufacturer ranges
Checksum/CRC or message counter fields — must increment/validate per protocol
Message timing intervals and timestamp consistency (no long gaps or jitter beyond spec)

Diagnostic algorithm

Connect a diagnostic scan tool, read all active/pending/historic DTCs and capture freeze-frame and event data.
Check for related communication DTCs (gateway, BMS, inverter A) and note sequence/timing of code set events.
Attempt live-data communication with Converter Control Module B. Note which parameters are invalid, out-of-range, blank, or flagged with parity/checksum errors.
Visually inspect module connector and wiring harness for damage, corrosion, bent pins or moisture. Repair any physical defects and re-check.
With vehicle powered as required and HV systems disabled per manufacturer procedure, verify module supply voltage and ground at the connector. Repair poor power/ground and retest.
Check CAN bus physical layer: measure bus voltages, check for proper termination resistance (~60 ohms total) and look for short to battery/ground using insulated test methods. Use an oscilloscope to view message waveforms and confirm correct message IDs and timing.
If bus messages are present but data fields are invalid, capture raw CAN frames and compare message contents to expected format (byte layout, counters, CRC).
Review software/firmware calibration versions for Converter Control Module B and related modules. Reflash or update per manufacturer instructions if a mismatch or known bug exists.
After repairs or updates, clear codes and perform a road/functional test to verify the fault does not return and that live-data values remain valid.
If wiring, power and software are confirmed good and the module still sends invalid data, consider replacement of Converter Control Module B and re-test. Follow manufacturer procedure for module programming and initialization.
Caution: follow all high-voltage safety procedures if accessing HV inverter/converter components; only qualified technicians should perform HV work.

Likely causes

Loose or corroded connector pins at Converter Control Module B
Low or intermittent module supply voltage or ground
CAN bus wiring damage or missing termination resistor
Module firmware mismatch after a software update or replacement
Internal controller malfunction in the DC/AC converter module

Fault status

⚠️ Status

Invalid data received from DC/AC Converter Control Module B — data format, checksum/CRC, or field values outside expected range; communication integrity issue detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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