After reading the owner's manual, and still having problems, then go see the dealer. Try putting it in neutral first
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If it has 4-wheel drive you would see controls on the dash to engage 2-wheel high, 4-wheel high or 4-wheel low.
The 4 wheel drive system on a 2002 Land Rover Discovery is engaged by pressing the 4 wheel drive button on the dash. It sends an electrical signal which activates the system.
It could be the problem. The dealer can scan the code with a Tech II unit they have. www.trailvoy.com The Trailblazer enthusiast forum!
The 2002 Chevrolet Tahoe has rear wheel drive.
The 2002 Nissan Sentra has front wheel drive.
The 2002 Kia Optima has front wheel drive.
The 2002 Jeep Wrangler has four wheel drive.
The 2002 Toyota Corolla has front wheel drive.
The 2002 Volvo S60 has front wheel drive.
The 2002 BMW X5 has all wheel drive.
The 2002 Subaru Forester has all wheel drive.