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
Where is the TCM located?
2005 PONTIAC GRAND PRIX
BOBBY7789
- MEMBER
- 1 POST
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JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
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.
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.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Apr 7, 2024 at 7:04 PM
Don't show the location of TCM?
Jun 13, 2025 at 11:53 AM
STRAILER
- ✓ASE Certified Mechanic
- 54,837 POSTS
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.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
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Jun 13, 2025 at 11:57 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.