Where is the TCM located?

2005 PONTIAC GRAND PRIX
260,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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BOBBY7789
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I'm needing to replace the TCM in my car listed above GT, but can't find where it's located?
Apr 7, 2024 at 3:15 PM
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JACOBANDNICKOLAS
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Hi,

This vehicle doesn't have a separate module for the transmission (TCM). Instead, the transmission is controlled by the powertrain control module (PCM). It is located at the front left (driver's side) of the engine compartment.

I attached the wiring schematic below, so you have a reference.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below. Note: I had to cut the schematic in half to make it readable. I did overlap the two so you can follow from one to the next.
Apr 7, 2024 at 7:04 PM
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TURBOJAY
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Don't show the location of TCM?
Jun 13, 2025 at 11:53 AM
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STRAILER
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There is only the PCM that controls the transmission. The PCM is under the dash on the left side near the data port connector. Check out the images (below). Let us know if you need anything else.
Jun 13, 2025 at 11:57 AM