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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 92 (Smart Key Unit Diagnosis (HEV)) >> DTC B1603: CAN Bus Off >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC Strategy
  • CAN signal check
  1. Poor connection
  2. Power supply to Smartkey Unit (PIC IMMO Unit)
  3. Short to battery or ground in CAN high or low signal together
  4. Smartkey Unit (PIC IMMO Unit)
Enable Conditions
  • IG ON or Engine ON
Threshold value
  • CAN high/low: Voltage is "0" means short to ground, Voltage is "B+" means short to battery
Diagnostic Time
  • Right after DTC detected
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