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Home >> Hyundai >> 2017 >> Sonata Plug-In Hybrid >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Active Hydraulic Booster (AHB) System Diagnosis (HEV)) >> DTC C1604: ECU Hardware Error >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different car, the 2015 Hyundai Sonata. However, it is still accessible from the selected car via links, so may be relevant.
Item Detecting Condition Possible Cause
DTC Strategy
  • Internal Monitoring
  1. Faulty AHB ECU
Enable Conditions
  • When the MCU can't erase or write a data of the EEPROM.
  • If the master/slave processor detects abnormal operation in RAM, ROM, interrupt, timer, A/D converter and cycle time
  • If the ECU detects abnormal operation in internal power supply
Fail Safe
  • EBD warning lamp and buzzer are activated.
  • "Check Brake!" message is displayed on LCD.
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