Restore Smooth, Reliable Shifting to Your Pontiac Montana
Is your 2006, 2007, 2008, or 2009 Pontiac Montana suffering from transmission problems like harsh shifting, getting stuck in gear, or an illuminated Check Engine Light? Before you consider a costly transmission overhaul, the problem is often a faulty Transmission Control Module (TCM). As a technician with over 20 years of experience, I’ve seen how a failing TCM can mimic major mechanical failure. This VIN-programmed T42 TCM, service part number 24234503, is the direct, plug-and-play solution to restore your minivan’s performance and reliability.
This isn’t just a part; it’s a complete solution. We program the module to your vehicle’s specific VIN before shipping, ensuring it communicates perfectly with your engine computer and transmission right out of the box. This eliminates the need for expensive dealership programming, saving you hundreds of dollars and significant downtime. For the family vehicle that needs to be dependable, this 2006-2009 Montana TCM is the smart, efficient repair.
A Technician’s Notebook: The Misleading Limp Mode
A few months back, a 2008 Pontiac Montana was towed into my bay. The owner was frustrated; the van was stuck in what felt like second gear (a classic limp mode symptom) and the transmission warning light was on. They were worried about needing a new transmission. I pulled the codes and saw a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of pulling the pan, my first step was to check the TCM. These T42 modules, especially on vehicles of this age, are prone to internal circuit failure from heat and vibration. We installed one of our pre-programmed modules, and in less than 30 minutes, the van was shifting perfectly. The customer saved thousands and drove away with a reliable vehicle. This is the most common fix for these symptoms.
Is Your Pontiac Montana Showing These Symptoms?
- ✔ Harsh, jerky, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in “limp mode,” usually locked in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Inability to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable drop in fuel economy due to inefficient gear management.
- ✔ Complete loss of communication with the TCM, preventing the vehicle from starting or shifting out of park.
A Straightforward Guide to Installation
Replacing the 2006-2009 Montana TCM is a job most DIYers can handle in their own driveway. The module is conveniently located and requires no specialized tools.
- 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 Pontiac Montana, the TCM is typically found mounted on the driver’s side strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. 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. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a guaranteed fit for the following vehicles, in addition to many other GM models. This specific listing is tailored for the 2006-2009 Montana TCM replacement.
- MONTANA 06-09 Transmission; (LH strut tower)
- UPLANDER 06-09 Transmission; (LH strut tower)
- TERRAZA 06-07 Transmission; (LH strut tower)
- RENDEZVOUS 06-07 Transmission; (air cleaner box)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- LACROSSE / ALLURE 06-09 Transmission; (lower air cleaner housing)
- COBALT / G5 / PURSUIT / ION 06-10 Transmission; (LH strut tower)
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for me?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This makes the part truly plug-and-play. You can install it yourself and it will work immediately, without a trip to the dealer for expensive programming.
Do I need any special tools for this installation?
No. Basic hand tools, like a socket set to remove the mounting bolts and your hands to undo the connectors, are all that’s required. An OBD2 scanner is recommended to clear old codes, but is not strictly necessary for the module to function.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it at your convenience. This simplifies the process and saves you the hassle of return shipping.
Will this part fix a P0700 trouble code?
Yes, very often. The P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, the problem is the TCM itself. Replacing a faulty module is a common and effective way to resolve a P0700 code and related transmission issues.
What if I have a different part number on my old module?
That’s common. GM uses many different service numbers for the same T42 module. Our part number 24234503 is interchangeable with a long list of others, including 24252114, 24239224, and 24242391. As long as your vehicle is on the compatibility list, this module will work perfectly.