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Pinpoint Test K : U0121:00: Notes

Refer to Wiring Diagram Four Wheel Drive Systems for schematic and connector information.

Normal Operation and Fault Conditions 

The TCCM sets the DTC U0121 when key messages such as wheel speed, brake pressure or torque are not received for longer than 5 seconds. This loss of key messages degrades the transmission functionality. Other modules that require data from the ABS module all set communication DTC's and may also exhibit system function concerns.

Terrain Management Module DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0121:00 Lost Communication With ABS Module Sets in continuous memory in the TCCM if ABS module data messages received from the ABS module over the HS-CAN are missing for longer than 5 seconds.

Possible Sources 

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