DTC U0101-Lost Communication With TCM: Notes

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article.

• When Monitored: 

  Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater than 3 seconds. 

• Set Condition: 

  The PCM doesn't receive a Bus Message from the Transmission Control Module for 7 consecutive seconds. The circuit is continuously monitored. 

Refer to ELECTRONIC CONTROL MODULES/ DIAGNOSIS AND TESTING  for diagnostic procedures and for further possible causes.