Network, generic

U02A0 Invalid Data Received From Hybrid/EV Battery Interface Control Module D

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Although it sits among lost-communication codes, U02A0 is a data error code. The expected slot in the invalid-data series, U04A4, had already gone to particulate matter sensor A, as Ford's 2014 code list and Volkswagen's 2014 Touareg data show, so module D's data fault landed here. Interface modules are the boards in the high-voltage pack that read cell voltages and temperatures and switch cell balancing for the battery controller; GM's 2016 hybrid tables show eight of them, A to H, on a daisy-chained serial link, with a processor test and a balancing test for each board (P1EA0 and P1EA4 for D). U02A0 means module D still answers, but its data fail integrity or plausibility checks. No manufacturer documents U02A0 publicly. A silent D is U01A3. Expect a power limit.

Likely causes

Interface board D delivering corrupted or implausible data
Poor contact in the internal communication chain of the pack
Mismatched software between battery controller and interface modules
Damaged cell sense lead at module D

Symptoms

  • Hybrid or electric system warning
  • Reduced power or no charging
  • Engine runs more often on hybrids

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–6 h

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

Parts involved

hv battery interface module d

Related codes

U01A3U033DU04A3U04A5U04A4

References: gsi.ext.gm.com, performanceparts.ford.com, static.nhtsa.gov, law.cornell.edu.