Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

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Engine Control Module (1) - Remove - Engine Control Module Replacement
Remove all retainers from the engine control module bracket.
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Engine Control Module Bracket Bolt (1) - Remove [4x]
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Engine Control Module Bracket (1) - Remove
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Remove transmission control module (1) from the engine control module bracket (2).