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U0341 Software Incompatibility With Hybrid/EV Battery Interface Control Module H

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Packs with eight boards end at H. Besides GM's 2016–2019 plug-ins, BMW's i3 is one: bulletin SI B61 02 16 lists eight cell supervision circuits for the i3 battery and, for boards built between December 2013 and September 2014, orders all of them renewed together once diagnosis calls for a CSC. When only one section of a pack is changed, GM adds a step for Volt and ELR: per PIC6097A the new section must be balanced to the rest with the EL 50332 service tool, using interface VIM-1 for the 2011–2015 Volt and 2014–2016 ELR and VIM-2 for the 2016–2019 Volt, with the tool itself updated first. Matching generations matter at every step. U01A7 and U04A8 are H's lost-contact and invalid-data codes.

Likely causes

Software of the last board does not match after a section replacement
Only some boards renewed where the maker requires a complete set
Service tool, adapter or tool software of the wrong generation used

Symptoms

  • Car cannot be made ready to drive
  • Code set after battery section work
  • Drive power reduced

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,200
Time1–4 h

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

Parts involved

hv battery interface module h

Related codes

U01A7U04A8U0340U0342

References: static.nhtsa.gov, static.nhtsa.gov.