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U0342 Software Incompatibility With Hybrid/EV Battery Interface Control Module I

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Mitsubishi shows that a replaced monitoring board must first be given its place in the pack. On the 2022 Outlander plug-in hybrid, numbering of the cell monitoring units (CMU) is done at the factory; after a CMU or battery module has been replaced, the workshop runs CMU ID numbering from the battery management unit with the M.U.T.-III tester, never while the battery is charging, and checks that every ID data item reads complete, repeating the routine otherwise. The same manual names the CMU among probable causes of cell temperature faults. Mitsubishi uses no letter codes here, and the ninth position I presupposes a pack with nine boards. U01A8 is I's lost-contact code, U04A9 invalid data.

Likely causes

Replaced board not numbered or registered in the battery controller
ID numbering run while charging or aborted before completion
Board of another battery variant fitted at position I

Symptoms

  • Battery warning after a module or CMU replacement
  • EV mode or charging restricted
  • MIL possible on plug-in hybrids

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–600
Time0.5–2 h

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

Parts involved

hv battery interface module i

Related codes

U01A8U04A9U0341U0343

References: mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.