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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 Volkswagen Golf has front wheel drive.
The 2002 Toyota Tacoma has rear wheel drive.
The 2002 Chevrolet Camaro has rear wheel drive.
The 2002 Nissan Altima has front wheel drive.
The 2002 Toyota Highlander has front wheel drive.
The 2002 Toyota Camry has front wheel drive.
The 2002 Volkswagen Passat has front wheel drive.
The 2002 Kia Optima has front wheel drive.