Network, generic

U033E Software Incompatibility With Hybrid/EV Battery Interface Control Module E

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A fifth interface board exists, for example, in BMW's 330e plug-in hybrid of the F30 series: bulletin SI B61 25 17 lists voltage-measurement codes for cell supervision circuits 1 to 5 in the battery electronics SME, under BMW's own numbers 21F0C2 to 21F0C6. BMW replaces a CSC only if the fault is active, has been logged five times, or twice with the MIL lit, and once harness and cell voltages have been checked. Kia shows why software has to follow such parts: on the 2015–2017 Soul EV, a replaced battery pack or BMS may need a BMS update chosen by the installed part numbers and confirmed by ROM ID (TSB ELE 155). U033E would flag a fifth board whose software the master rejects; U01A4 and U04A5 cover silence and bad data.

Likely causes

Fifth supervision board replaced without matching the controller software
Battery controller not updated to the part numbers now installed
Boards of different production levels combined in one pack

Symptoms

  • Powertrain or hybrid warning, MIL possible on plug-in hybrids
  • Fault stored after a battery or BMS repair
  • Electric range or power temporarily limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–700
Time0.5–2 h

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

Parts involved

hv battery interface module e

Related codes

U01A4U04A5U033DU033F

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