2006 Truck going into 4 low on its own

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Mar 9, 2020 | 10:20 PM

#46

Seth Sawyer

Registered User

Joined: Mar 2020

Posts: 1

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How do you pull the service power? I’m assuming you just mean disconnect power to the transfer case so would that be a fuse or something

Mar 10, 2020 | 01:52 PM

#47

nvrenuf

Registered User

Joined: Dec 2006

Posts: 61

Likes: 3

From: Mobile, Al

Quote:

Originally Posted by Seth Sawyer

How do you pull the service power? I’m assuming you just mean disconnect power to the transfer case so would that be a fuse or something

I just unplugged the harness from the actuator on the t-case, it complains and gives me the "SERV 4WD" light every time I crank it but it's not trying to kill me going down the road anymore. This is 2+ years later for me and my t-case is still unplugged, fortunately I don't have a need for 4wd with this truck. I'm still amazed that no one has made an electric to manual shift conversion kit for the NV273 t-case, with all of the issues that can be found via search it would seem there's a market for it.

It's also frustrating that people (established users, not 1 post ghosts) that have posted they've done the conversion seem to disappear after having said they did it with no details on exactly what they did.

Dec 6, 2025 | 01:40 AM

#48

5.9Shadesofgrey

Registered User

Joined: Dec 2025

Posts: 1

Likes: 0

You are a hero

Quote:

Originally Posted by Lost Lake

I'm calling this problem RESOLVED.

I touched base with the tech that did the last work on my truck. What he did was a 'pin test' where he removed the TIPM connection that leads to the TC actuator. Several pins were not gripping like they should.

I guess what this entails is inserting a pin in each electrical connection and seeing how much resistance it has against pulling the pin out. The tech said several connections has very little grip on the pin.

He tightened those connections so they would grip the pin on the pigtail better, then coated everything with dielectric grease and I have had no problems since then.

They recommend removing all pigtails from the TIPM and checking all connections and greasing everything.

I hope this helps someone with the same problem down the road. Before you replace the TIPM or TC motor assembly, check the electrical connections at all the pigtails and make sure the connection is solid. Add dielectric grease and see if that resolves the issue.

I wonder how many TIPM's were replaced unnecessarily???

.

Your dedication to this form is impressive. I’m experiencing this exact problem now. Described exactly as you speak! I’ll check everything out tomorrow. Thank you!