GMT800: "SERVICE 4WD" message, unreponsive 2WD button

[Matt_]

True... i use a Snap-On Modis

 

[Bigredmariner]

I had tried with my hand held AutoXray and saw nothing at all, connected EFI Live and bam there it was. So yeah it takes a good quality reader to see those codes.

 

[PenguinLTZ]

The 3 that I have done have been on '01 and '02 models, my Tahoe being one of them.

I do not recall what the code ID was. I was not aware of the issue being resolved in '03.

Good stuff!

I wish I had the OTC reader then, that I have now!

 

[thunderstruck]

Odds are you are right about the encoder sensor, Jarrod. There is lots of talk on several forums about the sensor showing wear and getting gummed up with oil.

 

[Bigredmariner]

If I would have kept my first one and cleaned it up I would bet that it could have been re-used. The oil and grit on the contacts were skewing the readings but there was really no other damage. I would be willing to take it out and just clean it next time just to see, I mean if it didn't work I wouldn't be out any money only an hour or so of time.

 

[thunderstruck]

Okay, I started to get the Service 4WD messages frequently, so I finally replaced the encoder sensor. Easy job, but fast-foward less than a week, and I'm getting the message again.

Guessing now would be a good time to try to pull codes?

 

[Bigredmariner]

Hate to say it but the next item that could be toast is the Transfer Case Control Module. It's also several hundred dollars to replace.

Get the codes pulled first.

 

[thunderstruck]

Yeesh. I do believe the Avalanche is becoming a bigger money pit that my 95.


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[PenguinLTZ]

Yeesh. I do believe the Avalanche is becoming a bigger money pit that my 95.


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Did something else go wrong?

 

[OldCracker29]

Damn, I guess servicing these 4x4's is one reason I've never owned one. Hope you get it figured out Kyle.