Is your 2006-2009 Pontiac Montana experiencing frustrating and unpredictable transmission problems? If you’re dealing with harsh shifting, getting stuck in gear, or a persistent check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a reliable family vehicle feel unsafe and undependable. This T42 TCM, part number 24252114, is the definitive solution, arriving pre-programmed to your Montana’s specific VIN for a true plug-and-play fix.
The TCM is the electronic brain of your automatic transmission. It controls everything from shift points and line pressure to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the symptoms you’re experiencing. Our process eliminates the guesswork and the expensive trip to the dealership. We flash the module with the latest GM software using your VIN, ensuring it works perfectly with your vehicle’s systems right out of the box.
Case Study: A Tricky Diagnosis
A customer brought in their 2008 Montana complaining of intermittent ‘limp mode’—it would get stuck in 3rd gear without warning, but only after driving for 20+ minutes. There were no hard codes, just a generic P0700 (Transmission Control System Malfunction) stored. We checked the wiring and solenoids, which all tested fine. The intermittent nature pointed directly to heat-related failure inside the TCM. After installing one of our pre-programmed T42 modules, the problem was completely resolved. The customer saved hundreds by avoiding dealership diagnostic fees and unnecessary parts replacements.
Is Your Montana Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you notice any of the following, it’s time for a replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ The transmission refuses to upshift or downshift correctly.
- ✔ A sudden drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission.
A Straightforward Guide to Installation
Installing your new 2006-2009 Montana TCM is a simple job that most DIYers can complete in under 30 minutes with basic hand tools. This module is conveniently located for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On your Pontiac Montana, the TCM is found mounted to the left-hand (driver’s side) strut tower in the engine compartment.
- Remove the Old Unit: Carefully unplug the electrical connectors. Note the tab locations to avoid damage. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scanner to clear any old fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24252114 and is interchangeable with numerous other GM service numbers. While it fits a wide range of vehicles, it has been confirmed to fit the following:
- Pontiac Montana (2006-2009) – Transmission; (LH strut tower)
- Chevrolet Cobalt (2006-2010) – Transmission; (LH strut tower)
- Chevrolet HHR (2006-2011) – Transmission; (LH engine compartment)
- Chevrolet Impala (2006-2011) – Transmission; (lower air cleaner housing)
- GMC Sierra 1500/2500 (2007-2013) – Transmission; (next to battery)
- Chevrolet Silverado 1500/2500 (2007-2013) – Transmission; (next to battery)
- GMC Savana / Chevrolet Express Vans (2006-2014) – Transmission; (RH engine compartment)
- Pontiac G6 (2006-2010) – Transmission; (LH strut tower)
- Saturn Vue (2007-2010) – Transmission; (LH front engine compartment)
- …and many more GM models. Please verify your part number or contact us for fitment confirmation.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for my 2006-2009 Montana TCM?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your van’s engine and other systems, eliminating the need for expensive dealership programming.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector tabs are typically all you need. An OBD2 scanner is recommended to clear old codes after installation.
Is there a core charge for this part?
No, there is no core charge. You can keep your old part, so you don’t have to worry about the cost or hassle of shipping it back to us.
Will this fix a P0700 trouble code?
Yes. The P0700 code is a general fault code indicating the TCM has detected a problem. In most cases where the TCM itself is the source of the failure, replacing it with this pre-programmed unit will resolve the P0700 code and any related transmission codes.