Restore Smooth, Reliable Shifting to Your Pontiac Montana
Is your 2006-2009 Pontiac Montana struggling with harsh shifts, getting stuck in gear, or showing a transmission warning light? These are classic signs of a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen these T42 modules cause countless headaches for vehicle owners. The constant stress of an unpredictable transmission, especially in a family vehicle like the Montana, is something no one should have to deal with. This isn’t just an inconvenience; it’s a matter of reliability and safety.
This replacement T42 TCM, part number 24255280, is the definitive solution. We take the guesswork and high cost out of the repair by pre-programming the module to your vehicle’s specific VIN. This means it arrives ready for a true plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. It directly communicates with your vehicle’s systems to restore precise gear changes, proper torque converter lockup, and dependable performance, just like it did from the factory.
A Technician’s Notebook: The Erratic Montana Minivan
A customer brought in their ’07 Montana, complaining of it randomly refusing to shift past 2nd gear and occasionally slamming into drive. They were worried about a catastrophic transmission failure. After a quick scan, I saw a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of jumping to a costly internal repair, I checked the TCM. In my shop, I’ve found that on these GM platforms, intermittent electrical faults within the T42 module itself are the culprit in over 80% of these cases. Replacing the module with a properly programmed unit solved all the issues instantly, saving the customer thousands.
Is Your Minivan Showing These Transmission Warning Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s highly likely your 2006-2009 Montana Transmission Module is the root cause:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission feels like it’s slipping between gears.
Simple Steps to Restore Your Montana’s Shifting
This is a repair that most DIYers can confidently handle in their own driveway in under 30 minutes. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the 2006-2009 Pontiac Montana, the TCM is conveniently located on the driver’s side of the engine bay, mounted to the LH strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the system. Start the vehicle and enjoy your restored transmission performance!
Verified Fitment for Your General Motors Vehicle
While this is the correct part for your Pontiac Montana, this T42 TCM is also compatible with a wide range of GM vehicles. It is interchangeable with part numbers including 24252114, 24234503, 24230461, 24239224, and 24256960. Please verify your part number or consult the list below.
- Pontiac Montana (2006-2009): Located at the LH strut tower.
- Chevrolet Cobalt / HHR / Impala (Various Years): Check lower air cleaner housing or LH engine compartment.
- GMC Sierra / Chevrolet Silverado (Various Years): Typically found next to the battery.
- Buick LaCrosse / Lucerne (Various Years): Found in the lower air cleaner housing or LH engine compartment.
- …and many other GM models from 2006-2014.
Frequently Asked Questions
Do I need to have a dealer program this module?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a direct plug-and-play replacement, saving you the time and expense of a dealership visit.
Is this a new or used part?
This is a high-quality, OEM-spec replacement part built to meet or exceed original factory standards and is backed by a one-year warranty for your peace of mind.
What tools are needed for installation?
Basic hand tools are all you need. Typically, a small socket set to remove the mounting bolts and a wrench for the battery terminal will be sufficient for the entire job.
Will this fix a P0700 code?
A P0700 code is a general transmission fault code, often triggered by a failing TCM. While this module is the most common fix, you should ensure there are no other underlying issues. In most cases, replacing the faulty TCM will resolve the P0700 and related codes.
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.