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U04A5 Invalid Data Received From Hybrid/EV Battery Interface Control Module E

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Module E is the fifth interface board in a high-voltage pack, and U04A5 says its data reach the battery controller in a form that fails the checks. This is one of three letters Volkswagen spells out: for the ID.4 of model years 2021 to 2024 the on-car analysis list of July 2024 groups U04A5 with U04A1 and U04A9, all stored in address 8C, and asks dealers to phone the VW helpline before any repair. The list gives no thresholds and does not explain why only A, E and I appear; the gap of four letters between them is visible but not documented. Wikipedia describes the ID.4 pack as nine or twelve modules. Silence from E is U01A4, a software mismatch U033E. The car shows an electrical system message.

Likely causes

Software issue in the battery electronics (VW ID.4, clarify with helpline)
Interface control module E internally faulty
Contact fault on the internal link to module E

Symptoms

  • Electrical system warning message
  • Drive power or charging limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery interface module e

Related codes

U01A4U033EU02A0U04A6U04A1U04A9

References: static.nhtsa.gov, en.wikipedia.org, gsi.ext.gm.com.