Non Europe or N. American Emissions
DTC U2105 (Non Europe or N. American Emissions)
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC U2105 BUS OFF Signal
Conditions for Setting the DTC
The transmission control module (TCM) detects that the BUS OFF signal is continued for 0.2 seconds.
Action Taken When the DTC Sets
* The TCM will request the illumination of the hold lamp and store the DTC when the TCM detects a failure on the 1st ignition cycle
* The TCM judges the throttle opening is 0 percent for shift point and lock-up point control.
* The TCM judges the throttle opening is 100 percent for line pressure control.
* No lock-up
* No self-learning control
* The TCM judges the engine revolution is 0 RPM.
Conditions for Clearing the DTC
* The TCM turns off the hold lamp when no further failures are detected on the next ignition cycles.
* The scan tool can clear the DTC from the TCM history.
* The TCM detects the BUS normal signal for 2 seconds continuously.
Cause for Failure
* Wiring harness or connector between engine control module (ECM) and TCM
* The ECM
* The TCM
