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U04BE Invalid Data Received From Battery Charger Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U04BE is logged when a module receives data from battery charger control module B that it cannot accept. Charging hardware can come in more than one stage: the Audi e-tron, for example, was sold in Europe with 11 kW AC charging as standard and 22 kW as an option. Which unit counts as A or B is up to the maker. Polestar shows one assignment: on the Polestar 3 the control unit GCCC stores U01BB00, the lost-contact sibling for charger B, when the on-board AC charger GHCA has failed; AC charging then stops while DC charging still works, and the fix is a new GHCA. No maker documents U04BE itself. It is not emission-related; expect slow or no AC charging.

Likely causes

On-board charger B internally faulty (Polestar 3 analogy, grid disturbances)
Charger or charging-control software out of date
Bus wiring or plug at the charger damaged

Symptoms

  • AC charging slow, interrupted or impossible
  • DC fast charging usually still works
  • Charging fault message

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–4 h

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

Parts involved

on board charger

Related codes

U01BBU049CU057BU057C

References: static.nhtsa.gov, en.wikipedia.org.