Restore Your Minivan’s Drivability with a Reliable Transmission Solution
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 the electronic brain of your automatic transmission, a faulty TCM can make your family vehicle unreliable and frustrating to drive. This replacement T42 TCM, part number 24243921, is the definitive, hassle-free solution to get your Montana shifting smoothly and dependably again.
We take the guesswork and extra cost out of the repair by pre-programming this module to your vehicle’s specific VIN. This means it arrives ready for a direct, plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. It’s an ideal fix for both seasoned mechanics and DIY-savvy owners looking to save time and money while restoring their vehicle’s performance.
A Technician’s Notebook: The Intermittent Montana
“I had a 2008 Pontiac Montana come into the shop last month with a complaint that was driving the owner crazy: intermittent ‘limp mode.’ It would drive fine for days, then suddenly refuse to shift out of 3rd gear, with a P0700 code stored. After checking the wiring and solenoids, which all tested fine, experience pointed me straight to the TCM. These T42 units, especially when located on the strut tower, are exposed to significant vibration and heat cycles. We installed a VIN-programmed module, and the problem was solved instantly. It’s a classic failure, and a pre-programmed unit is the most efficient fix, preventing diagnostic headaches and ensuring the repair is done right the first time.”
Is Your Montana Showing These Transmission Faults?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Addressing it with a new 2006-2009 Montana TCM can prevent further damage to your transmission.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ The Check Engine Light or transmission warning light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy.
- ✔ No communication with the TCM when using a scan tool.
Simple Swap: Your Montana TCM Installation Guide
This is a repair you can confidently tackle in your own driveway. For the Pontiac Montana, the TCM is conveniently located, making for a quick swap.
- 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 mounted on the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, VIN-programmed module in place of the old one and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any lingering fault codes from the vehicle’s memory. Start the vehicle and enjoy restored shifting performance!
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for the 2006-2009 Montana TCM and is also compatible with a wide range of other General Motors vehicles. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Partial Fitment List (Location in Parentheses):
- Pontiac Montana: 2006-2009 (LH strut tower)
- Chevrolet Uplander / Saturn Relay / Buick Terraza: 2006-2009 (LH strut tower)
- Chevrolet Cobalt / Pontiac G5 / Saturn Ion: 2006-2010 (LH strut tower)
- Chevrolet Impala / Monte Carlo: 2006-2011 (Lower air cleaner housing)
- GMC Savana / Chevrolet Express Vans: 2006-2014 (RH engine compartment)
- Chevrolet Silverado / GMC Sierra 1500: 2007-2013 (Next to battery)
- Chevrolet Tahoe / GMC Yukon: 2007-2009 (Next to battery)
- …and many other GM models. See the full fitment list or contact us for confirmation.
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. This module is delivered to you fully programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit for programming.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) at checkout. This ensures we can load the correct factory software and calibrations for your specific Pontiac Montana.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating the TCM has detected a fault. Often, replacing a failed TCM will resolve the P0700 and any related specific codes (like for solenoids). However, you should always ensure the transmission’s mechanical and electrical components are in good condition.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep or dispose of your old module without the hassle of sending it back.