Control module replacement and location

Tiny
SCOTT PICKLESIMER
  • MEMBER
  • 2016 CADILLAC SRX
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 148,942 MILES
I bought a control module from another 2016 cadillac srx and im going to install it in mine and need to know where the location is and if ill need to do anything so it will work properly. Ty
Tuesday, November 11th, 2025 AT 6:43 PM

1 Reply

Tiny
CANNON1349
  • MECHANIC
  • 864 POSTS
Hello, the control module is relatively simple to replace. Be sure to disconnect the battery and leave disconnected long enough for residual voltage to dissipate. It does mention programming, so you may run into BCM issues with mileage confliction etc. But it won't hurt to try. Alternatively you can tow the vehicle to the dealer to reprogram. Attached is the procedure below:

Procedure

Use a DVOM in order to measure the main relay circuit voltage at the ECM/TCM/IGN fuse in the underhood fuse block.

Use a DVOM in order to measure the main relay circuit voltage at the TCM/BATT fuse in the underhood fuse block

Disconnect the negative battery cable.

Remove the TCM/BATT fuse from the underhood fuse block.

Remove the ECM/TCM/IGN fuse from the underhood fuse block.

Disconnect the electrical connectors.

Ensure that there is no main relay circuit voltage (ECM/TCM/IGN Fuse).

If replacing, reprogram the ECM.

Let us know how it goes,
William
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Thursday, November 13th, 2025 AT 10:16 AM

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