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.

2010 Cadillac CTS V, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Control Module Replacement

Fig 1: Engine Control Module

Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Engine Control Module (ECM)

Procedure

Record the current engine oil life percentage and use a scan tool to update the NEW ECM, if replacing.
Disconnect the ECM harness connectors. The ECM harness connectors are equipped with locking levers. Rotate the levers upward to the connectors to disengage the connector.
Disengage the ECM bracket retaining tabs.
If replacing, program the ECM. Refer to Control Module References .

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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.