If the transmission in your 2006-2009 Pontiac Montana is acting up—with harsh shifts, delayed gear engagement, or a frustrating check engine light—you’re not alone. As a technician with over two decades of experience, I’ve seen these symptoms countless times, and the culprit is very often a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it falters, it can make your family minivan feel unreliable and unsafe. This T42 Transmission Control Module, part number 24235753, is the definitive, hassle-free solution.
The biggest hurdle with electronic module replacement is usually the programming. Dealerships charge a premium for this service, adding time and cost to your repair. We eliminate that step entirely. Each module is expertly pre-programmed to your Montana’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives at your door ready for a true plug-and-play installation, loaded with the latest GM software updates for optimal performance. You get a reliable, long-term fix without the dealership headache.
Is Your Montana Exhibiting These Transmission Woes?
- ✔️ Abrupt, jerky, or erratic gear changes.
- ✔️ The vehicle is stuck in “limp mode,” refusing to shift out of 2nd or 3rd gear.
- ✔️ An illuminated Check Engine Light or Transmission Warning Light.
- ✔️ Diagnostic Trouble Codes (DTCs) stored, especially P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758).
- ✔️ Failure to upshift or downshift, leading to poor acceleration and bad fuel economy.
- ✔️ A noticeable delay when shifting from Park into Drive or Reverse.
From the Diagnostic Bay: The Intermittent Shifting Nightmare
A customer brought in a 2008 Pontiac Montana with a problem that was driving them crazy. The shifting was perfect for days, then suddenly it would start slamming into gear or refuse to shift. They’d already been to another shop that couldn’t find the issue because it was so intermittent. After hooking up my scan tool and monitoring live data, I saw the TCM was intermittently losing communication. This is a classic sign of internal failure. We installed one of our pre-programmed T42 modules, and the problem was solved permanently. It’s not always a bad solenoid or clutch pack; sometimes, the brain just needs replacing.
DIY-Friendly Installation: Get Your Minivan Shifting Smoothly
You don’t need to be a master mechanic to replace this module. For the 2006-2009 Montana, the TCM is conveniently located and the swap is straightforward. The entire process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement.
- Locate the Module: On your Montana, the TCM is found mounted to the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if needed. Then, unbolt the old module from its bracket.
- Install the New TCM: Mount the new, pre-programmed module in place of the old one and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy smooth, responsive shifting.
Verified Vehicle Compatibility
This T42 TCM is the correct part for the 2006-2009 Pontiac Montana. It is also a direct-fit, pre-programmed solution for a wide range of other General Motors cars, trucks, and SUVs. Please verify your part number or consult the detailed fitment list below to ensure compatibility with other models.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This is the key benefit of our service. We program the module to your vehicle’s VIN before shipping, so it’s ready to install right out of the box. This saves you hundreds of dollars and a trip to the dealership.
What tools are required for installation?
Basic hand tools are all you need. Typically, a socket wrench to remove the mounting bolts and a small flathead screwdriver to help with the connector clips are sufficient. An OBD2 scanner is recommended to clear codes post-installation.
Is this a new or used part?
This is an OEM-quality, tested component that has been professionally prepared and programmed for your vehicle. It is backed by our one-year warranty for your peace of mind.
Is there a core charge for my old TCM?
No. We do not require you to send your old module back. There is no core charge, which simplifies the process for you.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause, this code can also be triggered by other transmission issues. If the TCM is indeed the faulty component, this part will resolve the code.