4wd diagnosis

[trogers449]

I have a 2007 Tahoe and it has been stuck in 4wd for a while. Seemed like initially it was intermittent but eventually stayed in 4wd. Fuses checked good and no trouble/warning lights. I started tinkering with it today trying figure out the problem. I felt pretty good about the actuator and decided to replace it. After replacing it I now have a “service 4wd” dash light and the 2wd light is on and the 4wd high light blinks. Unable to change from this condition. Fuses are still good. I do think the actuator was bad but maybe something else led to its failure?

 

Curious if anyone has had a similar issue or could provide advice on what to check next? Looking for how or if I can test the encoder motor on the transfer case but not finding much out there.

 

Thanks in advance for any input you might have!

 

 

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[Ian Mills]

Silly question: Have you scanned for codes yet?

Also, it sounds like it could be something in the transfer case. Maybe something to do with the transfer case shift motor?

[trogers449]

I have an appointment tomorrow at the stealership to have it scanned.


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[swathdiver]

1 hour ago, trogers449 said:

I have an appointment tomorrow at the stealership to have it scanned.

You need a Tech-2 to properly work on these things, throwing parts at it is a waste or time and money.  The Tech-2 will would have paid for itself this time and will pay for itself next time, get one.

[trogers449]

You need a Tech-2 to properly work on these things, throwing parts at it is a waste or time and money.  The Tech-2 will would have paid for itself this time and will pay for itself next time, get one.

You are absolutely correct. Its just getting past that “paying for it the first time”. Lol. I think I’ll ask santa!

 

 

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[MaverickZ71]

53 minutes ago, swathdiver said:

You need a Tech-2 to properly work on these things, throwing parts at it is a waste or time and money.  The Tech-2 will would have paid for itself this time and will pay for itself next time, get one.

Best affordable brand and source of a Tech-2?

[swathdiver]

58 minutes ago, MaverickZ71 said:

Best affordable brand and source of a Tech-2?

Bret, Vetronix and Bosch long ago transferred production of these to China.  So the Chicoms make them today.  Mine is from 2017 and is identical to a 2010 Vetronix in function save for the metal PCMCIA slot door.  Anyhow, you'll want one with the last software update, 33.004 and with all the cables for testing and powering it up various ways which you will rarely use but they come in handy.  You do not NEED the software discs or for them to work, it's just nice to have if you can get it working on a Win XP or Win 7 machine.  You also need a Keystone Lite adapter to connect to a modern PC if you want to program modules.

 

So, you can and should buy them anywhere that has good reviews and customer service.  When mine arrived, the ODBII adapter was faulty but the seller sent a new one right away.  Mine has seen almost continual daily use since and I have replaced the adapters, cable and PCMCIA card and probably need to replace the VCI Module to work on GMT800 style vehicles.  Still it's a tough unit for $350 and some are getting them for much less lately delivered. Guys on the TahoeYukon forum have been picking them up from US sellers on Ebay lately too.

[swathdiver]

1 hour ago, trogers449 said:

You are absolutely correct. Its just getting past that “paying for it the first time”. Lol. I think I’ll ask santa!

 

 

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I hear ya there, when I first needed one they were $3500 and was at the mercy of the dealerships to fix it.  Thankfully, I have a very competent one that I can trust nearby when I need them.