Restore Your Minivan’s Smooth Shifting and Reliability
If your 2006-2009 Pontiac Montana is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles, especially family haulers like the Montana, sidelined by these exact issues. This isn’t just an annoyance; it’s a safety concern. This high-quality T42 TCM, part number 24256960, is the definitive solution to get your vehicle driving like new again.
The real value here is our expert VIN programming service. We flash the module with your vehicle’s specific information and the latest GM software updates before it even ships. This means you get a true plug-and-play part that requires no expensive trips to the dealership for calibration. It’s designed to directly address the root cause of common electronic transmission problems, ensuring your 4-speed automatic operates with precision.
Is Your Montana Exhibiting These Transmission Issues?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more significant and costly transmission damage down the road.
- âś” Abrupt, jerky, or delayed gear changes.
- âś” The vehicle feels stuck in one gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” You’ve pulled diagnostic trouble codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- âś” A sudden drop in fuel economy or the transmission seems to be overheating.
- âś” Complete loss of communication with the transmission.
From the Diagnostic Bay
I remember a family came into the shop with their ’07 Montana SV6. The van was shifting so violently that they were afraid to drive it. Another shop had quoted them for a full transmission rebuild, a multi-thousand-dollar job. I hooked up my scan tool and immediately saw communication errors with the TCM. Instead of a costly mechanical overhaul, all they needed was a new, properly programmed module. We swapped this exact type of part in under 30 minutes. They drove away with a smooth-shifting van and saved a fortune. It’s a classic case where the ‘brain’ fails, not the brawn.
A Straightforward Guide to Installation
This is a repair you can confidently tackle in your own driveway. For the 2006-2009 Montana, the process is simple and requires basic hand tools. Expect to be done in less than half an hour.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On your Pontiac Montana, the TCM is typically found on the driver’s side of the engine bay, mounted to the LH strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed module in the same location and securely fasten 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 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct fit for the following vehicles and configurations. It is interchangeable with part numbers including 24242391, 24234503, and 24252114.
- 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)
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- LACROSSE 06-09 Transmission; (lower air cleaner housing)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- G6 06-10 Transmission; (LH strut tower)
- … and many other GM cars, trucks, and SUVs. Please verify your part number for a perfect match.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This makes it a true plug-and-play part, saving you from a mandatory and costly programming session at a dealership.
Do I need any special tools for this installation?
No, basic hand tools like a socket set are all you need. The most important part of the process is safely disconnecting the battery and ensuring the electrical connectors are securely reattached.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main computer (PCM) to turn on the Check Engine Light. While this module often resolves the underlying cause of a P0700, you should always diagnose the specific codes stored within the TCM itself (e.g., solenoid performance codes) to confirm the TCM is the point of failure.
My old part has a different number on it. Will this still work?
Yes, GM uses many different service numbers for the same T42 module. This part, 24256960, is a compatible replacement for a long list of other numbers, including 24252114, 24234503, and more. As long as your vehicle is on the fitment list, this module will function correctly.
Is there a core charge?
No, there is no core charge. You are not required to send your old, faulty module back to us, which simplifies the process for you.