David (173.21.137.88) - Wed Sep 9 17:58:23 2009

In Nov 2005, the dealership changed out an encoder/sensor due to a problem I was having with the four wheel drive automatically shifting from 2 wheel to 4 HI or even 4 LO while driving. The problem has returned. Has anyone else had a problem like this? Has anyone changed out the sensor or encoder before? Thanks

David

Reply #1 Matt (75.35.171.50) - Thu Sep 24 15:01:37 2009

My encoder sensor on my 2005 Z71 Tahoe also went out within the 36K mile warranty and was replaced. The neutral (red) light would randomly come on, accompanied by "Service 4WD" on the read out. The issue repeated closer to 50K miles, once my warranty had lapsed of course. Random LED activity on the push buttons returned, occasionally working fine, as well as the intermittent availability of 4WD. Around 75K miles, the issue became constant. I lived without 4WD for a while until my Tahoe started "auto engaging" 4WD both high and low range, despite the push buttons not functioning.

After being told that only a Chevy Dealer could diagnose my 4WD system due to it requiring special equipment that Chevy alone possesses, I took it in and approved their $102.00 diagnostic fee. They determined in a few hours that it was another encoder sensor gone bad, possibly the same one, so I had it repaired. Stonebriar Chevrolet in Frisco dealer price to repair was 114.32 parts and 234.60 labor plus tax. No consideration was offered despite this being a repeat issue.

I plan to sell my Tahoe before this chronic problem happens again.

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