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U0412 Invalid Data Received From Battery Energy Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U0412 is stored when the hybrid or engine controller receives data from battery energy control module A, the management unit of the high-voltage battery, that it rejects as invalid. Volkswagen's 2014 Jetta Hybrid OBD chart sets it on implausible received data. FCA lists U0412-00 for the 2019 Chrysler Pacifica plug-in hybrid (TSB 08-114-22) among codes that light the MIL and can remain as permanent codes, so the vehicle fails a state smog check; the fix is new software for the hybrid control processors, not a battery part. CARB requires emission-related control units to be monitored, which explains the MIL. U0111 means lost contact, U0413 covers module B, U0312 a software mismatch. Charging or electric driving may be limited.

Likely causes

Software error in hybrid controller or battery management (FCA: reflash HCP/AHCP)
Bus wiring or connector fault between battery module and hybrid controller
Weak 12 V battery disturbing module start-up
Battery energy control module internally faulty

Symptoms

  • Check engine light on, code may become permanent
  • Charging or electric driving limited
  • Hybrid system warning message

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

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

Parts involved

battery energy control modulehybrid control modulecan bus wiring

Related codes

U0111U0312U0413U0411

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.