Symptom Chart - Four-Wheel Drive (4WD)

WARNING: This page is about a different variant/trim than selected.

SYMPTOM CHART

Condition	Possible	Sources Action
No communication with the Transfer Case Control Module (TCCM)	Scan tool High Speed Controller Area Network (HS-CAN) Battery Junction Box (BJB) fuse Power supply circuit Smart Junction Box (SJB) fuse Ground circuit TCCM Charging system	REFER to MODULE COMMUNICATIONS NETWORK .
The vehicle does not shift between 4X4 AUTO and 4X4 modes correctly	Four-Wheel Drive (4WD) indicator(s) TCCM BJB fuse SJB fuse Circuitry Transfer case clutch Mode Select Switch (MSS)	GO to PINPOINT TEST D .
The Four-Wheel Drive (4WD) indicators do not operate correctly/do not operate	Instrument Cluster (IC) 4WD system fault HS-CAN TCCM Ignition switch and/or circuitry SJB fuse Circuitry	GO to PINPOINT TEST J .
Four-Wheel Drive (4WD) does not engage at speed correctly	Transfer case clutch coil TCCM Integrated Wheel End (IWE)	GO to PINPOINT TEST E .
The front axle does not engage/disengage correctly	MSS IWE IWE solenoid Transfer case Vacuum leaks TCCM Circuitry	GO to PINPOINT TEST C .
Four-Wheel Drive (4WD) system jumps out of gear	Transfer case IWE vent MSS	GO to PINPOINT TEST F .
The vehicle has no torque or inadequate torque at rear wheels in 4X4 AUTO mode	Transfer case Circuitry TCCM	GO to PINPOINT TEST I .
Unable to duplicate customer concern	4WD indicator TCCM Transfer case and related components Wheel/tire assemblies	CARRY OUT the Four-Wheel Drive (4WD) System Functional Test. GO to PINPOINT TEST I .