Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Relieve the fuel system pressure. Fuel Pressure Relief
Oil Filler Cap - Remove
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Intake Manifold Cover Bolt (1) - Remove
Intake Manifold Cover (2) - Remove
Install the oil filler cap after removal of the intake manifold cover to prevent debris from falling into the engine.
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Fuel Feed Pipe (1) - Disconnect - Metal Collar Quick Connect Fitting Service
Raise and support the vehicle. Lifting and Jacking the Vehicle
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Rear Tire Front Air Deflector Bolt- Left Side and Right Side (1) - Remove [4x]
Rear Tire Front Air Deflector- Left Side and Right Side (2) - Remove [2x]
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Rear Wheelhouse Liner Bolt- Left Side (1) - Remove
Underbody Rear Air Deflector Nut- Left Side (2) - Remove [3x]
Underbody Rear Air Deflector Bolt- Left Side (3) - Remove [3x]
Underbody Rear Air Deflector Nut- Left Side (4) - Remove [2x]
Underbody Rear Air Deflector- Left Side (5) - Remove
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Rear Wheelhouse Liner Bolt- Right Side (1) - Remove
Underbody Rear Air Deflector Bolt- Right Side (2) - Remove [3x]
Underbody Rear Air Deflector Nut- Right Side (3) - Remove [3x]
Underbody Rear Air Deflector Nut- Right Side (4) - Remove [2x]
Underbody Rear Air Deflector- Right Side (5) - Remove
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Underbody Front Air Deflector Bolt- Right Side (1) - Remove [6x]
Underbody Rear Air Deflector Nut- Right Side (2) - Remove [5x]
Transmission Fluid Cooler Pipe Bracket Bolt- Right Side (3) - Remove [2x]
Underbody Rear Air Deflector- Right Side (5) - Remove
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Underbody Front Air Deflector Bolt- Left Side (1) - Remove [6x]
Underbody Rear Air Deflector Nut- Left Side (2) - Remove [5x]
Transmission Fluid Cooler Pipe Bracket Bolt- Left Side (3) - Remove [2x]
Underbody Rear Air Deflector- Left Side (5) - Remove
Courtesy of GENERAL MOTORS COMPANY

Floor Panel Number 4 Cross Bar Reinforcement Bolt (1) - Remove [6x]
Floor Panel Reinforcement (2) - Remove
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Catalytic Converter Nut (1) - Remove [2x]
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Exhaust Pipe Clamp (1) - Loosen [2x]
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Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Left Side (2) - Separate [2x]
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Exhaust Muffler (1) @ Exhaust Intermediate Pipe Insulator-Right Side (2) - Separate [2x]
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Electrical Connector (1) - Disconnect
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Electrical Connector (1) - Disconnect
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NOTE:
The rear bumper fascia is removed for illustration purposes only.

Exhaust Muffler Hanger Bracket Nut (1) - Remove [4x]
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With the aid of an assistant, remove the exhaust muffler (1).
Catalytic Converter Gasket (2) - Remove and DISCARD
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Exhaust Heat Shield Nut- Right Side (1) - Remove [3x]
Transmission Fluid Cooler Pipe Clamp Bolt- Right Side (2) - Remove
Exhaust Heat Shield Bolt- Right Side (3) - Remove
Exhaust Front Underbody Heat Shield- Right Side (4) - Remove
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Fuel Feed Pipe (1) @ Retainer (2) - Disengage
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Fuel Feed Pipe (1) @ Retainer (2) - Disengage [6x]
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Fuel Pump Fuel Feed Hose (1) @ Fuel Feed Pipe (2) - Disconnect - Plastic Collar Quick Connect Fitting Service
Fuel Feed Pipe (2) @ Retainer (3) - Disengage [2x]
Fuel Feed Pipe (2) - Remove