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U04A1 Network

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

A receiving module detected implausible data from hybrid/EV battery interface module A. Cell-voltage, current or temperature values fail plausibility checks against other inputs and are rejected.

Affected components

  • Hv battery interface module a

Common causes

  • High likelihood: Module internal fault or sensor input drift
  • Medium likelihood: Software version mismatch after replacement
  • Low likelihood: Gateway module routing CAN messages incorrectly

Possible symptoms

  • Multiple warning lights may illuminate
  • Affected modules may go into limp mode or shut down
  • Specific functions inoperative depending on module
  • Diagnostic tools may show communication faults

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • A drive cycle may be required after repair
  • Reduced-power or limp mode may occur

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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