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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System Diagnosis - HEV >> DTC U1004: Lost Communication with Hybrid Powertrain Control Module-H-CAN >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • No message from HCU
  1. Open or Short in CAN communication harness
  2. PCM/TCM
Enable Conditions
  • Time after TCM turns on >0.5sec.
  • 10V < Solenoid supplied power < 16V
Threshold Value
  • Message from HCU No message
Diagnostic Time
  • More than 2sec.
Fail safe
  • Prohibit torque reduction request
  • Prohibit line pressure control
  • E/C VFS control by TCU

* Inhibit TIME OUT happen at BUS OFF happen.
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