Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2018 Cadillac XTS BaseFACTORY OEM SERVICE PROCEDURE

Engine Control Module Replacement (LF3)

GM3291030

Courtesy of GENERAL MOTORS COMPANY

Callout

Component Name

Preliminary Procedure

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
Remove the charge air cooler coolant reservoir fill tee from the ECM bracket. Refer to Charge Air Cooler Coolant Reservoir Replacement - Fill Tee (LF3) .

1

Engine Control Module Bracket
Procedure
Release the retaining tab.

2

Engine Control Module

WARNING:

Refer to Safety Glasses Warning .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.