Transfer Case

DIAGNOSTIC TROUBLE CODE (DTC) 1
When the ignition switch is positioned to "RUN", the TCCM test to determine if RAM Standby Power (maintained battery power) to the TCCM was lost since the ignition was last turned off. When power is interrupted on pin C6 of the TCCM, the TCCM stores a "loss of RAM Standby Power" DTC 1.

DIAGNOSTIC TROUBLE CODE (DTC) 2
During electronic shifting, the TCCM checks the motor/encoder for normal operation. If the motor/encoder does not function correctly enough times, the TCCM stores a "motor/encoder failure" DTC 2.

DIAGNOSTIC TROUBLE CODE (DTC) 3
The TCCM performs a test each time the electric-shift motor is turned on or off. If the motor is not functioning properly the TCCM stores a "motor circuit failure" DTC 3, and the shift select buttons blink to inform the driver of a problem.

DIAGNOSTIC TROUBLE CODE (DTC) 4
Each time the ignition is turned on, the TCCM tests it's memory, program, and internal system to ensure that it is operating properly. If the TCCM detects a fault within itself, the TCCM stores a "RAM/ROM memory failure" (DTC) 4.
- When the TCCM is running a diagnostic, and a code 4 is displayed by the shift select buttons, replace the TCCM.