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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 78 (Telematics Unit Diagnosis (HEV)) >> DTC B2859: CDMA Modem Fail >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC strategy
  • Cannot communicate with modem chip
  1. TMU
Enable Conditions
  • Ignition ON
  • Battery voltage is between 9V and 16V
  • The main board and modem chip board should be combined normally through bridge.
Threshold value
  • Internal communication between main CPU and CDMA Modem chip fails
Diagnosis Time
  • The DTC is reported if the communication loss between main CPU and modem chip remained for 30 seconds at least.
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