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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC U0101: Lost Communication With TCM >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
DTC Strategy
  • Check CAN message transfer status
  1. Poor connection or damaged harness
  2. Faulty PCM
  3. Faulty TCM
Enable Conditions
  • Battery voltage > 10V
  • Engine speed > 32rpm
  • Delay time > 0.5 sec.
Threshold Value
  • No message from TCM for 0.1 sec.
Diagnostic Time
  • 1.5 sec.
MIL On Condition
  • 2 Driving Cycles
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