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2005 chevy trailblazer_ls
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Hi all, we have an 05 Trailblazer with around 62k miles... While driving down the highway in 2wd I looked and noticed it was in 4wd and appeared to be trying to jump to 4lo ... the 4wd light was lit and 4lo was blinking..

We saw this another time while driving on a windy road it jumped into 4wd... Is this a bad switch on the dash or what could be causing this ?

Thanks
 

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2004 gmc
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Probably some oxidized contacts inside the switch. If you haven't been exercising the system regularly, which you should just to make sure the actuators are kept lubricated, the switch can go intermittent. Due to the odd design, an intermittent contact is interpreted as a 4LO command.

With the ignition off, turn the switch from end to end 40-50 times and see if it behaves. If it acts up again, start looking on Ebay for a replacement. They're not that expensive, even at the dealer ($20-30).
 
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