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U0468 Invalid Data Received From Fuel Cell Control Module

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0468 marks invalid data from the fuel cell control module, the master controller of a hydrogen car, managing air and hydrogen supply, heat and water in the stack and the split of electrical power between stack, buffer battery and drive. Partners such as the motor inverter, battery management or the hydrogen storage unit reject its frames when checksums, counters or power requests do not hold up. No manufacturer documents U0468 publicly. Hyundai's supplier Kefico ranks the unit highest among the controllers of a fuel cell vehicle, and Hyundai's Nexo campaign T5D (2019-2020) rewrote its MIL logic together with that of the hydrogen storage management unit, so a lamp is possible. U0119 is lost contact, U0293 the hybrid/EV powertrain controller. Expect a warning, battery-only limp running or no READY.

Likely causes

Fuel cell control unit software needing an update from the manufacturer
Weak 12 V battery or poor ground disturbing the controller
Connector or bus wiring fault between the fuel cell unit and its partners
Internal fault in the fuel cell control module

Symptoms

  • Fuel cell system warning in the cluster
  • Reduced power, driving on the buffer battery only
  • Vehicle does not reach READY

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–4 h

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

Parts involved

fuel cell module

Related codes

U0119U0293

References: hyundai-kefico.com, static.nhtsa.gov, en.wikipedia.org.