Is your 2006-2009 Pontiac Montana struggling with harsh, unpredictable shifting or getting stuck in gear? As a technician with over 20 years of experience, I’ve seen these symptoms countless times, and the culprit is often a failing Transmission Control Module (TCM). Don’t let a faulty computer lead you to believe you need a costly transmission rebuild. This OEM-quality T42 TCM, part number 24234274, is the reliable, cost-effective solution to restore your minivan’s performance and peace of mind.
The TCM is the electronic brain of your automatic transmission, managing everything from shift timing to fluid pressure. When it fails, the signals become erratic, leading to the frustrating problems you’re likely experiencing. We take the guesswork and high costs out of the repair by pre-programming this module to your vehicle’s specific VIN. This means it arrives at your door ready for a true plug-and-play installation, with no need for an expensive trip to the dealership for programming.
Is Your Montana Exhibiting These Telltale Signs?
A failing TCM can mimic more serious mechanical issues. Before you suspect the worst, check if your vehicle is showing these common signs of a bad Montana Transmission Control Module:
- ✔️ Abrupt, 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 on.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid codes (P0750-P0774).
- ✔️ Failure to upshift or downshift properly.
- ✔️ A noticeable decrease in fuel economy.
- ✔️ Intermittent loss of communication with the module.
Case Study: The Family Minivan’s Ghost
A customer brought in a 2008 Pontiac Montana SV6 with a classic complaint: “It shifts fine when it’s cold, but after 20 minutes of driving, it starts jerking and sometimes won’t shift out of 2nd gear.” They had already been quoted over $2,500 for a transmission rebuild at another shop. I hooked up my scan tool and saw a P0700 code, but no specific solenoid faults, just intermittent communication loss with the TCM. Based on experience, I knew heat soak was a common killer of these modules. Instead of a rebuild, we installed a VIN-programmed TCM. The total repair took less than an hour and saved the customer thousands. The “ghost” in their transmission was just a faulty computer.
A Straightforward Guide to Installation
This is a repair that a confident DIYer can handle in their own garage in under 30 minutes. The TCM on the Pontiac Montana is conveniently located and easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2009 Montana, the TCM is typically found mounted to the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the mounting bolts holding the old module in place.
- Install the New TCM: Mount your new, pre-programmed module in the same location and securely tighten the bolts. Reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes. Start the vehicle and enjoy smooth shifting!
Verified Vehicle Compatibility
This module is a direct replacement for part number 24234274 and is interchangeable with a wide range of GM service numbers. While this listing is focused on the Montana Transmission Control Module, it also fits many other GM vehicles. Please verify your part number or contact us with your VIN to ensure perfect fitment.
- Pontiac Montana (2006-2009) – Transmission; (LH strut tower)
- …and many other GM models including the Uplander, Terraza, G6, Cobalt, Impala, and more.
Frequently Asked Questions
What does “VIN Programmed” actually mean for me?
It means the module arrives ready to install right out of the box. We load your vehicle’s specific VIN and the latest GM software onto it, so it communicates perfectly with your engine and other systems without requiring a trip to the dealer for expensive programming.
Will this fix my check engine light?
If your check engine light is on due to TCM-related trouble codes like P0700 or solenoid faults, this replacement module is designed to resolve those specific issues and allow the light to be cleared.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a very straightforward job. On the Montana, the TCM is located on the driver’s side strut tower, making it easy to access and swap in under 30 minutes.
Do I need to send my old part back?
No. We do not require a core return. You can keep or dispose of your old module, making the process hassle-free for you.
What happens if I ignore a failing TCM?
Continuing to drive with a faulty TCM can cause more than just poor performance. It can lead to excessive wear on your transmission’s mechanical parts, like clutches and bands, potentially turning a simple electronic fix into a major mechanical repair down the road.