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U019B Lost Communication With Battery Charger Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

U019B means battery charger control module A, the on-board charger of a plug-in vehicle, is no longer heard on the bus. Ford's 2014 OBD code list flags U019B as MIL-relevant, in line with CARB's rule that plug-in hybrids must detect charger faults that stop or slow charging. Audi bulletin 93 23 96 (A7 e quattro 2021-2022) finds U019B00 in hybrid manager J840 with a no-start and a charge plug shown as locked, caused by damaged wires at couplings T6bl and T8bd. On the 2025 e-tron GT the gateway logs it with a yellow electrical fault while a software fix is pending. Ford SSM 52527/52831 (F-150 Lightning 2022-2023) pair it with U0293 and a dead intelligent backup power feature, due to gateway software. U01BB and U027A cover chargers B and C.

Likely causes

Damaged wires at harness couplings exposed to the environment (Audi A7 PHEV)
Gateway or controller software (Ford Lightning, Audi e-tron GT)
Charger without 12 V supply, ground or wake-up signal
On-board charger control electronics faulty

Symptoms

  • Vehicle does not charge or charge plug stays locked
  • Electrical system warning, drive system cannot be activated
  • Export power or backup power features unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,500
Time0.5–4 h

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

Parts involved

on board chargercan bus

Related codes

U01BBU027AU0293U049C

References: performanceparts.ford.com, law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.