My 4WD (4 wheel drive) is not working why?

Welcome to 2CarPros. The circuit open code shows it is a connection issue lets use this guide and the wiring diagrams below to help fix the problem.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.

Does your truck have the Nv-246 transfer case in it? You can find the circle model stamp plate on the back side of the transfer case.
Here is a list of possible causes for each fault code listed
Also, found a technical service bulletin for code C1405 (only)
so you may what to look at that (TSB reference number 21-011-07)
possible causes
shift motor control A circuit open (dark green wire)
shift motor control B circuit open (yellow wire)
shift motor/ mode sensor assembly
totally integrated power module (TIPM)
C1407 transfer case brake control circuit low (TIPM)
Possible causes
transfer case motor brake circuit open (yellow w/grey stripe wire)
transfer case motor brake circuit shorted to ground (yellow w/grey stripe wire)
transfer case motor assembly
totally integrated power module (TIPM)
C1469 Front axle disconnect return control circuit high (TIPM)
Possible causes
Front axle lock control circuit shorted to voltage
Front axle lock control circuit shorted to ground
front axle disconnect module
totally integrated power module (TIPM)
C1405 transfer case range position sensor circuit high (TIPM)
Possible causes
totally integrated power module (TIPM) fuses
5 volt supply circuit shorted to voltage (yellow with orange stripe wire)
Mode sensor A circuit shorted to voltage (white with dark green stripe wire)
Mode sensor A circuit open (same as above white w/dark green)
TIPM sensor return circuit open
Shift motor/mode sensor assembly
Totally integrated power module (TIPM)

Hope this sheds some light, talk to you soon, TY

It sounds like the transfer case selector switch has gone out but to be sure lets run a test through the switch using this guide and the wiring diagrams (Below)

https://www.2carpros.com/articles/how-to-check-wiring

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Test for signal at the switch

Here is a a TSB

The TSB Reference number 21-011-07 applies only to 4wd light duty ram truck that are equipped w/a NV-246 t case and were built on or between October 30,2006 and June 19,2007. Let me know it this applies to your truck you may need to contact a dodge dealer and supply them with you VIN to get a exact built date. This TSB only applies to the C1405 code only to determine if the inner bearing support plate is worn allowing t case shift actuator to over-travel and cause a fault determined by the vehicle's computer.

CODE c140d - t case motor control circuit open (TIPM)
Diag steps
1Key on engine running at idle switch t case switch to ea. Position. With scan tool is c140d code active? Y/N
2Key off engine off Remove the TIPM C4 harness connector and measure resistance between the (t101 Shift motor Control A circuit and the (t102) Shift motor control B circuit. Is the resistance between 40-100 ohms?
3 Disconnect the shift motor/mode sensor assembly harness connector. Measure resistance between the (t101) shift motor control A circuit and the (t102) shift motor control B circuit at the shift motor/mode sensor assembly component side. Is the resistance between 40-100 ohms?
4 Measure the resistance of the (t101) shift motor control A circuit between the shift motor/mode sensor assembly harness connector and the TPIM C4 harness connector. Is the resistance above 5.0 OHMS?
5 Measure the resistance of the (t102) shift motor control B circuit between the shift motor/mode sensor assembly harness connector. Is the resistance above 5.0 ohms?
6. Inspect all wiring and connector that pertain to this circuit. Were any problems found?
Here is some pic of wiring diagrams at contain the t102 and t101 circuit.

Check out the diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers

It sounds like the transfer case shift actuator is not working which is common here is the location in the diagrams below so you can change it out. Check out the diagrams (Below). Please let us know what you find.

Hey GILLYMAN3000,

If you have access to a hoist raise the vehicle, activate the 4x4 and put the transmission in drive. If you release the brake and get someone to watch the front drive shaft you should be able to see if the transfer case is sending drive to the front differential.

Does the front driveshaft turn?

Once you have narrowed it down to transfer case or differential actuator then it will be quicker to pinpoint the issue.

Let us know what you are getting here.

Regards, Joe

Hey GILLYMAN3000,

Okay, so it sounds like you have an issue with the activation of the front differential actuator.

There is a TSB that could be applicable to your vehicle.

I have attached the TSB below, I would contact your local dodge dealer and see if this TSB is applicable to your vehicle.

Regards, Joe

Hey GILLYMAN3000,

No problem, keep us updated with the repair.

Best of luck!

Regards, Joe

Hello,

I am sure you checked the fuses and you replaced the first things I though of also. The only thing really left is the TIPM but to be sure lets test the continuity by following this guide

https://www.2carpros.com/articles/how-to-check-wiring

Here are the wiring diagrams, you can see these is not much to it. If the wiring checks out I would replace the TIPM you may need to get it programmed to the car FYI. If it was a speed senor it would throw a code.

Check out the diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

It sounds like you found the problem must have power from the TIPM for the system to work. Can you splice in and power that circuit up to see if that fixes it? That would be a kick. Double check that you have power at the fuse first.

Let me know.