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Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Transmissions
Satisfied Customers: 1735
Experience:  16 yrs. experience with auto, manual, & CVT drivelines
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TCCM or something-- stuck in 4wd sometimes 2005 durango..

Customer Question

TCCM or something-- stuck in 4wd sometimes 2005 durango.. how do I disengage for now at the TCCM to drive in 2wd
JA: What is the model of your '05 Dodge?
Customer: Durango
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Hoping
JA: Anything else you think the mechanic should know?
Customer: Thats it for now
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Dodge Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Transmissions
Expert:  Chad Farhat replied 1 year ago.

Hi my name is ***** ***** i will be assisting you

Expert:  Chad Farhat replied 1 year ago.

this module is what control it there is not a seperate module for it unfortunately

2005 Dodge or Ram Truck Durango 4WD V8-5.7L VIN D Save Article Select Print Option Complete Article Text Only Image(s) OnlyThe Front Control Module (FCM) contains the software to control the electric shift transfer cases in this vehicle. A separate Transfer Case Control Module (TCCM) is not used. The FCM is a microprocessor-based assembly, controlling the 4X4 transfer case shift functions via the actuation of a shift motor and utilizing the feedback of a mode sensor assembly. Communication is via the CAN bus. Inputs include user selectable 4X4 modes that include AWD, 4LOCK, 4LO, and Neutral.The Front Control Module (FCM) utilizes the input from the transfer case mounted mode sensor, the instrument panel mounted selector switch, and the following information from the vehicle's CAN bus to determine if a shift is allowed.
- Engine RPM and Vehicle Speed
- Diagnostic Requests
- Manual Transmission Clutch Switch
- Brake Applied
- PRNDL
- Ignition Status
- ABS MessagesOnce the FCM determines that a requested shift is allowed, it actuates the bi-directional shift motor as necessary to achieve the desired transfer case operating mode. The FCM also monitors the mode sensor while controlling the shift motor to determine the status of the shift attempt.Several items can cause the requested shift not to be completed. If the FCM has recognized a fault (DTC) of some variety, it will begin operation in one of four Functionality Levels. These levels are:
- Level Zero - Normal Operation.
- Level One - Only Mode Shifts Are Allowed.
- Level Two - Only Mode Shifts and Shifts Into LOW Are Allowed (No Neutral Shifts Are Allowed).
- Level Three - No Shifts Are AllowedThe FCM can also be operating in one of three possible power modes. These power modes are:
- Full Power Mode is the normal operational mode of the module. This mode is achieved by normal CAN bus traffic being present and the ignition being in the RUN position.
- Reduced Power Mode will be entered when the ignition has been powered off. In this state, the module will shut down power supplied to external devices, and to electronic interface inputs and outputs. From this state the module can enter either Sleep Mode or Full Power Mode. To enter this mode, the module must receive an ignition message denoting that the ignition is off, or not receive any messages for 5 ± 0.5 seconds. To exit this mode, the module must receive one ignition message that denotes that the ignition is in the RUN position.
- Sleep Mode will be entered, from the Reduced Power Mode, when no CAN traffic has been sensed for 20 ± 1 seconds. If during Sleep Mode the module detects CAN bus traffic, it will revert to the Reduced Power mode while monitoring for ignition messages. It will remain in this state as long as there is traffic other than run or start messages, and will return to Sleep mode if the bus goes without traffic for 20 ± 1 seconds.SHIFT REQUIREMENTS
If the FCM is in full power mode and at functionality level zero, it uses the following criteria to determine if a shift is allowed.If any of the driver controllable conditions are not met once the shift request is recognized, the FCM may illuminate one or more of the 4WD system message icons in the instrument cluster display.Mode shifts will be allowed regardless of transmission gear or vehicle speed, whenever the following conditions are met:
- Ignition key switch is in the RUN position.
- Front and rear wheel speed are within 21 km/hr (13 mph).
- A change in the Selector switch state indicates that a mode shift has been requested.
- A valid mode sensor signal is being sensed by the FCM.
- Proper transmit/receive messages are occurring on the CAN bus.
- An Anti-lock Brake System (ABS) event is not in progress.Range shifts will be allowed only if all of the following conditions are met:
- Ignition key switch is in the RUN position.
- Front and rear wheel speed are within 21 km/hr (13 mph).
- A change in the Selector Switch state indicating a range shift has been requested.
- Transmission in NEUTRAL signal must be recognized for at least 1.5 seconds ± 100 msec. (Automatic transmissions only)
- Proper transmit/receive messages are occurring on the CAN bus.
- Clutch signal is recognized for 500 msec ± 50 msec (Manual transmissions only).
- Vehicle speed is less than or equal to 4.8 km/hr (3 miles per hour).
- A valid mode sensor signal is being sensed by the FCM.
- An Anti-lock Brake System (ABS) event is not in progress.A shift into transfer case Neutral will be allowed only if all of the following conditions are met:
- Ignition key switch is in the RUN position, engine off.
- Front and rear wheel speed are within 21 km/hr (13 mph).
- The recessed Neutral Selection switch has been depressed continuously for 4.0 seconds ± 100 msec while all shift conditions have been continuously met.
- Transmission in NEUTRAL signal recognized from the bus. (Automatic transmissions only)
- Clutch signal is recognized from the bus (Manual transmissions only).
- Proper message transmissions/receptions are occurring on the CAN bus.
- Vehicle speed is less than or equal to 4.8 km/hr (3 miles per hour).
- Foot Brake is applied.
- A valid mode sensor signal is being sensed by the FCM.
- An Anti-lock Brake System (ABS) event is not in progress.A shift out of transfer case Neutral will be allowed only if all of the following conditions are met:
- Ignition key switch is in the RUN position.
- Front and rear wheel speed are within 21 km/hr (13 mph).
- The recessed Neutral Selection switch has been depressed continuously for 1.0 seconds ± 100 msec while all shift conditions have been continuously met.
- Transmission in NEUTRAL signal recognized from the bus. (Automatic transmissions only)
- Clutch signal is recognized from the bus (Manual transmissions only).
- Proper message transmissions/receptions are occurring on the CAN bus.
- Vehicle speed is less than or equal to 4.8 km/hr (3 miles per hour).
- A valid mode sensor signal is being sensed by the FCM.
- An Anti-lock Brake System (ABS) event is not in progress.