Network, generic

U057B Invalid Data Received From Battery Charger Control Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Charger C is the third on-board charger slot. Some vehicles split AC charging over several units: the extended-range Ford F-150 Lightning, for example, offers 19.2 kW through a dual on-board charger. A Porsche patent describes such a group, in which only one charger is wired to the inlet and acts as master while the others are linked to it only by a communication line. U057B means data from charger C reach the network but fail the checks, so the master or charging controller cannot share the load with it. No manufacturer documents U057B or names a third charger publicly. U027A is total loss of contact. The usual result is reduced AC charging power; driving is unaffected.

Likely causes

Charger C internally faulty
Charger C on a different software level than master or charging controller
Communication line between the chargers damaged

Symptoms

  • AC charging slower than expected
  • Charging fault message in the display or app

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

U027AU057CU049CU04BE

References: patents.google.com, en.wikipedia.org.