The Transfer Case Control Module (TCCM) is a specialty of the General Motor’s 4WD operation. It controls the electronically-operated 4-wheel-drive system. All of its functions involve the shift – processing the shift request, executing it, and verifying the completion. The transfer case control module symptoms make you aware of any problem with the system.

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Where is the transfer case control module located? You will find it under the driver’s side dashboard on the steering column. The driver can reach the connectors easily because it is facing towards them.

What Does A Transfer Case Control Module Do?

As you already know, the TCCM controls the shifting in the 4WD system. But, how does it do that?

The module determines the processing of the shift by using the speed of the vehicle and the real-time transfer case mode. if the shift is possible, the TCCM will complete it by activating the transfer case encoder motor. If necessary, it may also trigger off the front differential locking actuator. If the shift is not possible, the selector switch will come on and flash for 30 seconds.

Locating the TCCM is not tough.


Transfer Case Control Module Symptoms

Symptoms of a bad TCCM are likely to include flashing a warning message or turning on a warning light on the Driver Information Center (DIC). Apart from this obvious transfer case control module problem, you can look out for these following ones:

The 4×4 System Stops Working

Sometimes, engaging the 4×4 by pushing the switch panel does not do anything. Everything on the panel is dead and you might be wondering if it is going to cost you a big amount.

You have to perform a TCCM self-test to determine whether you need to change this component or not. Turn the ignition switch while observing the transfer case shift control switch indicators. A functioning TCCM will flash all the indicators before returning to the current gear.

You have to move onto examining a couple of circuits if the indicators don’t flash. Go on checking the battery positive voltage and ignition voltage. You also have to diagnose the connector of the transfer case shift control switch and the ground circuit for ground. If the TCCM fails the self-test but all these circuits turn out fine, you have to replace the TCCM.

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The Service 4WD Message

It is normal to have this message sometimes. It goes away when you shut the vehicle off and then turn it back on. But, it won’t be the case on a few occasions. A bad TCCM could be the reason along with the encoder motor and the button pack.

It is easy to diagnose the symptoms.