If you’re dealing with the headaches of a faulty transmission in your 2006-2009 Pontiac Montana, you know how frustrating it can be. Unpredictable shifting, warning lights on the dash, and a general lack of confidence in your vehicle can turn any drive into a stressful event. As a technician with over two decades of experience, I’ve seen countless GM vehicles, especially family haulers like the Montana, come into the bay with these exact issues. The problem often isn’t a catastrophic transmission failure, but rather its electronic brain: the Transmission Control Module (TCM).
This T42 series Transmission Control Module, part number 24235753, is the definitive solution. It’s not just a replacement part; it’s a complete fix that arrives at your door pre-programmed to your Montana’s specific Vehicle Identification Number (VIN). This crucial step ensures that the module communicates flawlessly with your vehicle’s systems right out of the box, eliminating the need for an expensive and time-consuming trip to the dealership for programming. It restores the precise, smooth shifting your vehicle had when it was new.
A Technician’s Notebook
I remember a 2008 Montana that came into the shop a few months back. The owner was worried about a full transmission rebuild. The van would slam into gear from a stop and sometimes refuse to shift past 3rd gear, triggering a P0700 code. After a quick diagnostic, we confirmed the TCM was the culprit. Instead of a multi-day, thousand-dollar repair, we ordered a VIN-programmed module like this one. It arrived the next day, and the installation took less than 25 minutes. The customer was back on the road with a smooth-shifting, reliable vehicle for a fraction of the cost they feared. This is the power of a targeted, quality-assured repair.
Is Your Montana Exhibiting These Transmission Issues?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Harsh, jerky, or erratic gear changes.
- ✔ The vehicle gets stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700 or various solenoid-related codes (e.g., P0753, P0758).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
DIY-Friendly Installation Guide: A 30-Minute Fix
One of the best parts about this solution is how accessible it is for the home mechanic. For the 2006-2009 Pontiac Montana, the process is straightforward.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: On your Montana, the TCM is conveniently located on the driver’s side, mounted to the LH strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While our VIN programming handles the critical setup, it’s always good practice to use a basic OBD-II scan tool to clear any lingering fault codes from the system’s memory. Start the vehicle and enjoy restored performance!
Confirmed Vehicle Compatibility
This T42 TCM is a direct-fit replacement for part number 24235753 and is interchangeable with a wide range of other service numbers, including 24242391, 24234503, and 24252114. While this listing is focused on the 2006-2009 Pontiac Montana, this module also fits many other GM vehicles. Please verify your part number or consult the fitment list below:
- MONTANA 06-09 Transmission; (LH strut tower)
- UPLANDER 06-09 Transmission; (LH strut tower)
- TERRAZA 06-07 Transmission; (LH strut tower)
- COBALT 06-10 Transmission; (LH strut tower)
- G5 07-10 Transmission; (LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
- HHR 06-11 Transmission; (LH engine compartment)
- And many more GM cars, trucks, and SUVs.
Frequently Asked Questions
Do I need to do any programming after installation?
No. This Transmission Control Module comes fully programmed to your vehicle’s VIN. It is a plug-and-play solution, saving you a trip to the dealership.
Is this a new or used part?
This is an OEM-quality replacement module, built to meet or exceed original factory specifications and backed by a one-year warranty for your peace of mind.
What tools are required for installation?
Basic hand tools are all that’s needed, typically a socket set to remove the mounting bolts and a flathead screwdriver to help with connector tabs if they are stubborn. No specialized electronic tools are required.
Is there a core charge for my old part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of sending it back.