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The "service 4 wheel drive" light is on because the TCCM (Transfer Case Control Module) has detected a problem with the system. The light will remain on until the problem is fixed. Your local auto parts store can read the code(s) in the TCCM. The code(s) will help determine what the problem is.
What else can I help you with?
Does the trailblazer have overdrive?
2004 trailblazer have over drive
Is the 2004 Toyota Camry front wheel drive rear wheel drive or four wheel drive?
The 2004 Toyota Camry has front wheel drive.
Is the 2004 Volkswagen Passat front wheel drive rear wheel drive or four wheel drive?
The 2004 Volkswagen Passat has front wheel drive.
Is the 2004 Ford Mustang front wheel drive rear wheel drive or four wheel drive?
The 2004 Ford Mustang has rear wheel drive.
Is the 2004 Subaru Forester front wheel drive rear wheel drive or four wheel drive?
The 2004 Subaru Forester has all wheel drive.
Is the 2004 Acura NSX front wheel drive rear wheel drive or four wheel drive?
The 2004 Acura NSX has rear wheel drive.
Is the 2004 Hyundai Accent front wheel drive rear wheel drive or four wheel drive?
The 2004 Hyundai Accent has front wheel drive.
Is the 2004 Ford Expedition front wheel drive rear wheel drive or four wheel drive?
The 2004 Ford Expedition has rear wheel drive.
Is the 2004 Volvo XC90 front wheel drive rear wheel drive or four wheel drive?
The 2004 Volvo XC90 has front wheel drive.
Is the 2004 Subaru Legacy front wheel drive rear wheel drive or four wheel drive?
The 2004 Subaru Legacy has all wheel drive.
Is the 2004 Volvo XC70 front wheel drive rear wheel drive or four wheel drive?
The 2004 Volvo XC70 has all wheel drive.
Is the 2004 Cadillac CTS front wheel drive rear wheel drive or four wheel drive?
The 2004 Cadillac CTS has rear wheel drive.
