If your 2006-2009 Pontiac Montana is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a family minivan, reliable performance isn’t just a convenience—it’s a matter of safety. This OEM-quality T42 TCM, part number 24235732, is the definitive solution to restore your vehicle’s drivability and your peace of mind. Over my 20 years in the shop, I’ve seen countless drivers spend a fortune on unnecessary transmission work when the real problem was a simple electronic module. This part is your direct path to a lasting fix.
This module arrives expertly pre-programmed to your Montana’s specific Vehicle Identification Number (VIN). This means you can skip the expensive and time-consuming trip to the dealership for programming. It’s a true plug-and-play solution designed for both professional technicians and savvy DIYers. By precisely managing shift points, torque converter lockup, and transmission line pressure, this 2006-2009 Montana TCM will make your minivan drive like new again, eliminating harsh gear changes and restoring fuel efficiency.
Is Your Montana Showing These Transmission Warning Signs?
- ✔ Harsh, slamming, 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 the generic P0700 or specific solenoid codes like P0751, P0752, P0756.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable decrease in gas mileage.
- ✔ Intermittent loss of communication with the module.
Case Study: A Tricky Diagnosis
A customer brought in their 2008 Montana a few months back. The van would randomly refuse to shift out of 2nd gear, and they had been quoted over $2,000 for a transmission rebuild at another shop. After plugging in my scan tool, I saw a P0700 code and a few intermittent solenoid circuit faults. Instead of tearing down the transmission, I checked the TCM. Sure enough, after swapping in one of our pre-programmed T42 modules, all the codes cleared and the van shifted perfectly. It was a 30-minute, sub-$200 fix that saved them from a massive, unnecessary repair bill.
A Straightforward Guide to Your TCM Installation
Replacing the 2006-2009 Montana TCM is a job most DIYers can handle in their own driveway in under 30 minutes. On the Pontiac Montana, the module is conveniently located on the driver’s side of the engine bay, attached to the LH strut tower.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic work.
- Locate the Module: Open the hood and find the TCM on the driver’s side strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed module in the same location, securely tightening the bolts. Reconnect the electrical harnesses until 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 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a guaranteed fit for the following vehicles:
- 2006-2009 Pontiac Montana (Located at LH strut tower)
- 2006-2009 Chevrolet Uplander (Located at LH strut tower)
- 2006-2007 Saturn Relay (Located at LH strut tower)
- 2006-2007 Buick Terraza (Located at LH strut tower)
This module also serves as a direct replacement for a wide range of other GM vehicles, including models like the Impala, Cobalt, HHR, and G6, making it a versatile and reliable part for the GM platform. It is interchangeable with service numbers 24242391, 24234503, 24252114, 24235732, and more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you hundreds in dealership fees.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of sending it back.
What tools are required for installing this 2006-2009 Montana TCM?
You’ll only need basic hand tools, such as a socket wrench set to remove the mounting bolts and disconnect the battery. No special equipment is necessary.
Will this fix my P0700 check engine light code?
Yes, in most cases. The P0700 code is a general fault request from the TCM. If the TCM itself is the source of the failure, replacing it with our programmed module will resolve the root cause and allow the code to be cleared.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you confidence in the quality and reliability of your repair.