U0597

Code

Generic U — Network/User

Invalid Data Received From AC/DC Converter Control Module A

Brand: Generic

Type: U — Network/User

Views: UK: 23 EN: 36 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty AC/DC converter control module (software or hardware fault)
Intermittent or failed CAN/LIN network communication (open/shorted wiring, poor termination)
Corroded or loose connectors/pins at the converter module or gateway
Power or ground supply problems to the converter control module
Software mismatch, incorrect flash, or calibration file
Noise on the high-voltage or low-voltage lines causing data corruption

Symptoms

DTC U0597 stored with possible related fault lights (EV/Hybrid/Service message)
Reduced or disabled charging of high-voltage battery
Vehicle may enter limp or reduced functionality mode
Inconsistent or missing converter status values in scan tool data
Intermittent electrical faults or strange behavior of charging system

What to check

Read all stored and pending U-codes and related module codes with a manufacturer-level scan tool
View freeze frame and live data for AC/DC converter messages to identify missing/invalid fields
Confirm module is present on the network and responding to diagnostic requests
Visually inspect connector pins, locking tangs, and harness for damage or corrosion
Check 12V supply and ground at converter control module for proper voltages and continuity
Scan CAN bus for error counters, bus-off events, and message frequency abnormalities

Signal parameters

CAN message ID and expected cycle time from AC/DC converter module
Data Length Code (DLC) and expected byte layout for converter messages
Checksum or CRC field (if used) and validation method
CAN High/Low differential voltages (idle ~2.5V, dominant ~1.5V/3.5V levels)
Message frequency (Hz) and timeout threshold expected by receiving module
Diagnostic response to request messages (UDS/CAN service responses)

Diagnostic algorithm

Retrieve complete DTC list from all modules and note freeze frame data and occurrence frequency.
Attempt to clear the code and see if it returns; verify if fault is permanent or intermittent.
Use a capable scan tool to monitor the AC/DC converter CAN messages — confirm presence, message ID, DLC, payload, and checksum/CRC fields.
Compare live data values against expected ranges and timing; note any garbled, truncated, or out-of-range bytes.
Inspect wiring and connectors at the AC/DC converter module and gateway for damage, corrosion, water intrusion, or loose pins.
Measure 12V supply and ground for the converter module under key-on and during reproduction; check for voltage drop or intermittent loss.
Check CAN physical layer: measure CAN H/L voltages, termination resistance (~60 ohms total), and look for short to battery or ground.
If available, capture CAN bus waveform with scope to identify noise, reflections, or intermittent faults; correlate with DTC set times.
Verify module software/firmware levels and compare to vehicle calibration data; reflash or update software if recommended.
If wiring, power, and gateway are verified good and errors persist, consider replacing or bench-testing the AC/DC converter control module per manufacturer procedures.
After repairs, clear codes and perform full system test including charge cycle and road/drive cycle to confirm fault resolution.

Likely causes

Damaged harness or connector at AC/DC converter control module
Missing or corrupted message checksum/CRC from module
Module losing supply voltage intermittently (low 12V or internal fault)
CAN bus termination resistor open or incorrect value
Recently updated or replaced module with incompatible software

Fault status

⚠️ Status

Invalid data received from AC/DC converter control module A: messages failed validation (bad checksum, incorrect format, out-of-range values, missing fields, or timing errors). May be intermittent or persistent; check network, power/ground, connectors, and module software.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

Repair manuals