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I have a 2012 3500 4x4, Service 4x4 light on with a trailer…

Customer Question
I have a 2012...

I have a 2012 3500 4x4, Service 4x4 light on with a trailer disconnect light. 4x4 will not engage? No lights on trailer brake controller .

Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed?

Brake fluid...?

Mechanic's Assistant: Are you fixing your 3500 yourself? What have you tried so far?

Yes, we had some blown fuses, the power outlets were blown. I fixed it. Then the Service 4x4 and Brake controller lights came on. I've searched all fuses. Seem ok

Submitted: 7 months ago.Category: Dodge
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Answered in 18 hours by:
12/9/2017
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 7 months ago
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 24,064
Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

There are quite a few things that could be causing your problems. If fuses are good then it's going to require some electrical testing to determine exactly what is wrong. The brake controller itself or wiring may be causing that issue, the service four wheel drive light may be on for several reasons including the transfer case motor, wiring, final drive control module and the disconnect actuator.

Are you hoping to do the required testing yourself?

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Customer reply replied 7 months ago
We found the problem, it was missing the fuse for the transfer case!
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 7 months ago

I'm glad you got it repaired.

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