Operation CHARM: Car repair manuals for everyone.
Home >> Cadillac >> 2008 >> SRX AWD V6-3.6L >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Control Module >> Service and Repair >> 5L40-E/5L50-E - Automatic Transmission
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

5L40-E/5L50-E - Automatic Transmission



Transmission Control Module Replacement

Removal Procedure





1. Unlock the transmission control module (TCM) electrical connector by pulling the retainer (2) away from the electrical connector (1).

Important: Twisting or tilting of the TCM electrical connector while disconnecting may result in bent or misaligned electrical terminal pins.


2. Carefully disconnect the electrical connector (1) from the TCM.




3. Remove the TCM from the mounting bracket by pulling back on the retaining tabs (1) to release the control module .



Installation Procedure





1. Align the TCM with the locating pins (2) on the module mounting bracket.
2. Install the TCM by seating it fully into the bracket until all of the retaining tabs (1) have engaged the edge of the module edge.





Important: Twisting or tilting of the TCM electrical connector while connecting may result in bent or misaligned electrical terminal pins.


3. Carefully connect the TCM electrical connector (1) to the TCM.
4. Lock the TCM electrical connector securely to the TCM by pushing the retainer (2) toward the electrical connector (1) until fully seated.
5. A replacement TCM must be programmed with the proper software/calibrations. Refer to Control Module References (Programming and Relearning) .

Important: It is recommended that transmission adaptive pressure (TAP) information be reset.


Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, the engine control module (ECM), powertrain control module (PCM) or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.


6. Reset the TAP values. Refer to Transmission Adaptive Functions (Transmission Adaptive Functions) .


pro multis · About Operation CHARM