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Home / DTC / U04AE — Invalid Data Received From Hybrid/EV Battery Interface Control Module N

U04AE — Invalid Data Received From Hybrid/EV Battery Interface Control Module N

Detailed page for trouble code U04AE.

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U04AE

Generic U — Network/User

Invalid Data Received From Hybrid/EV Battery Interface Control Module N

Brand: Generic
Type: U — Network/User
Views: UK: 15 EN: 16 RU: 21
AI status
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Page language: EN

Causes

  • Corrupted or malformed CAN/LIN messages from the battery interface module
  • Open, shorted, or intermittent wiring/connectors on the battery interface communication lines
  • Poor ground or low battery voltage affecting module operation
  • Module software mismatch or firmware bug
  • Faulty battery interface control module hardware
  • Electromagnetic interference (EMI) or high-voltage isolation issues preventing proper data

Symptoms

  • Hybrid/EV system warning or MIL illuminated
  • Reduced propulsion or limp-home mode for hybrid/EV functions
  • Loss or restriction of charging/discharging of high-voltage battery
  • Inability to enter EV mode or start hybrid system
  • Recorded communication errors or message integrity faults in scan tool data
  • Intermittent operation of battery-related features (regen disabled, range errors)

What to check

  • Read all related freeze frames and stored communication U-codes with a dealer-level scan tool
  • Verify 12V battery voltage and charging system before advanced diagnostics
  • Inspect connectors and wiring at the Battery Interface Control Module for corrosion, damage, or loose pins
  • Check CAN bus voltage between CAN high and CAN low with key on (typical ~2.5V differential midpoint) and for expected differential waveform with scope
  • Monitor CAN messages from the Battery Interface Module: presence, frequency, and payload validity
  • Check ground points for the HV battery interface and body/engine block grounds for security and corrosion

Signal parameters

  • CAN message ID(s) from Battery Interface Control Module (expected ID(s) per vehicle service data)
  • Message frequency (Hz) and expected update rate
  • Data payload fields: pack voltage, pack current, SOC, cell voltages, temperatures, status flags
  • Message checksum or CRC validity
  • CAN bus differential voltage and noise level
  • 12V supply voltage to the module and ground integrity

Diagnostic algorithm

  1. Retrieve all current and history codes from all modules. Note freeze-frame and failing module ID.
  2. Confirm vehicle 12V battery health and charging; recharge or replace if low. Re-check for code reappearance.
  3. Visually inspect the Battery Interface Control Module connector and harness for damage, corrosion, water intrusion, or bent pins. Repair any concerns.
  4. With a scan tool, monitor the specific CAN message(s) from the battery interface module. Confirm message presence, correct update rate, and that CRC/checksum fields are valid.
  5. If messages are missing or corrupted, backprobe CAN high/low at the module connector. Use an oscilloscope to check waveform quality, bus idle voltage, and for reflections or excessive noise.
  6. Wiggle test the harness while monitoring messages to reproduce intermittent faults. Repair/replace faulty wiring or connectors found.
  7. Check module supply and ground circuits for proper voltage and continuity. Repair poor grounds or supply issues and clear codes.
  8. Inspect other devices on the same bus for faults or bus loading. Disconnect nonessential modules one at a time to isolate source of corruption.
  9. Consult manufacturer technical service bulletins for known software/firmware issues. Reflash or update module software if directed.
  10. If wiring and bus are confirmed good and software is up to date, consider replacing the Battery Interface Control Module. Program/configure replacement per manufacturer procedure and confirm repair by road test and rescanning for codes.

Likely causes

  • Damaged CAN high/low wiring or connector at the Battery Interface Control Module
  • Failed or corrupted Battery Interface Control Module (hardware or firmware)
  • Poor ground at battery pack or module causing corrupted transmissions
  • Vehicle battery (12V) low/unstable causing module resets and invalid messages
  • Bus termination resistor open/short or interfering device on the network

Fault status

⚠️ Status
Invalid data was received from the Hybrid/EV Battery Interface Control Module N. This indicates corrupted, malformed, or unexpected messages from that module on the vehicle communication network or a problem with the module itself.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

U04A0 U04A1 U0401 U0100 U0415 U0422
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