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U033D Software Incompatibility With Hybrid/EV Battery Interface Control Module D

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

On the first-generation Chevrolet Volt the monitoring electronics end at the fourth board. GM's 2012 Volt table refers to four slave units through its own codes: P1EB2 to P1EB5 report a slave that answered wrongly or not at all when a programming session ended, and U2603 to U2606, listed in GM's U-code catalogue for the 2011 Saab 9-4X as loss of hybrid battery interface control modules 1 to 4, block the software comparison while a slave is silent. A fourth slot exists there, but GM uses its own numbers instead of U033D; in the 2018 table P1EB5 is labelled module D not programmed. A failed flash of that board thus shows up as P1EB5. U01A3 and U02A0 are the generic lost-contact and invalid-data codes for D.

Likely causes

Programming of the fourth board aborted or answered with an error
Replacement board D still on a superseded software version
Interrupted link to board D masks or disturbs the version check

Symptoms

  • Code appears after programming or replacing a battery section
  • Hybrid warning, MIL possible on plug-in hybrids
  • Reduced propulsion until all boards match

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

hv battery interface module d

Related codes

U01A3U02A0U033CU033E

References: gsi.ext.gm.com, saabwisonline.com, gsi.ext.gm.com.