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U04B0 Invalid Data Received From Hybrid/EV Battery Interface Control Module P

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U04B0 closes the series: interface module P is the sixteenth and last letter the code lists provide for these boards, with U01AF for lost contact and U0349 for a software mismatch. Packs with more than sixteen monitored sections do exist, such as Ultium batteries with up to 24 modules, so either several modules share one board or the maker uses its own codes beyond P; which applies is not published. The next code, U04B1, already belongs to a different device, the battery monitor module. As with the other letters, U04B0 means the battery controller receives P's messages but finds their content unusable, which leads to power limits and a warning. No manufacturer documents U04B0 publicly.

Likely causes

Interface control module P faulty
Contact fault on the internal link to module P
Battery controller software misreading module P

Symptoms

  • High-voltage system warning
  • Power and charging limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–4,000
Time2–10 h

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

Parts involved

hv battery interface module p

Related codes

U01AFU0349U04AFU04B1

References: en.wikipedia.org, gsi.ext.gm.com.