Network, generic

U044B Invalid Data Received From Battery Energy Control Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

A third battery controller, module C, appears where a pack is divided into separately managed sections or a vehicle has more than one battery system. A receiver, typically the hybrid or vehicle controller, sets U044B when C's frames on cell voltages, temperatures, state of charge or contactor status fail validity checks; U014A is lost contact, U0412 and U0413 cover modules A and B. No manufacturer documents U044B publicly. Volkswagen group documents number such controllers: Bentley bulletin 2051553/2 for the 2017-18 Bentayga logs battery and sensor faults under battery management 2, the unit serving the dynamic ride roll control. Expect reduced electric power or a hybrid system warning, since the receiver cannot rely on the pack data.

Likely causes

Software of battery module C not matching the vehicle controller
Faulty cell or temperature sensing inside the pack section managed by C
Bus wiring, connector or 12 V supply fault at module C

Symptoms

  • Hybrid or battery system warning
  • Reduced electric power or range
  • Functions supplied by the affected battery switched off

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

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

Parts involved

battery energy module ccan bus wiring

Related codes

U014AU0412U0413U034C

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