Restore Flawless Shifting to Your Pontiac Montana
Is your 2006, 2007, 2008, or 2009 Pontiac Montana suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can lead to a frustrating and potentially unsafe driving experience. This genuine OEM-quality T42 TCM, part number 24235340, is the definitive solution to restore your vehicle’s transmission performance to factory standards.
From the Diagnostic Bay
We recently had a 2008 Montana come into the shop with classic limp-mode symptoms—stuck in 3rd gear with a P0700 code. The owner had already spent a significant amount of money replacing a couple of shift solenoids based on a generic code reader’s output, but the problem persisted. After a quick diagnostic, we confirmed the internal circuitry of the original TCM was failing intermittently. Instead of continuing to chase phantom solenoid issues, we installed one of our VIN-programmed T42 modules. The vehicle was back on the road in under an hour, shifting perfectly, with all codes cleared. This is a common scenario; often, the root cause isn’t the mechanical parts but the electronic controller that manages them.
Symptoms of a Failing GM T42 TCM
A faulty transmission computer can manifest in several ways. If you’re experiencing any of the following issues, it’s highly likely your TCM is the culprit. Confirming these symptoms can save you from unnecessary and costly repairs to other transmission components.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and performance.
- ✔ Decreased fuel economy due to inefficient gear management.
- ✔ Complete loss of communication with the transmission, preventing it from engaging.
The Ultimate Solution: A Pre-Programmed 2006-2009 Montana TCM
Don’t settle for a generic part that requires an expensive trip to the dealership for programming. Our T42 TCMs are meticulously prepared for your specific vehicle. We flash the module with the latest GM software updates and program it to your vehicle’s unique VIN before it ships. This ensures 100% compatibility and a true plug-and-play installation. Simply install the module, and you’re ready to go. This process not only restores function but also ensures optimal shift points and fuel efficiency as intended by the manufacturer.
Built to strict OEM specifications, this module is a direct replacement for a wide range of service numbers, including 24252114, 24234503, and 24235340. It’s the reliable, long-term fix for your transmission woes, backed by our one-year warranty for your peace of mind.
Easy Installation Process
For the 2006-2009 Pontiac Montana, the TCM is conveniently located on the driver’s side, attached to the LH strut tower in the engine compartment. The replacement process is straightforward for a DIY mechanic or any professional technician.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the Module: Find the TCM on the driver’s side strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors and unbolt the old module from its bracket.
- Install the New TCM: Mount the new module, reconnect the electrical harnesses securely, and then reconnect the battery.
- Final Steps: Start the vehicle. Although the module is pre-programmed, it’s good practice to use a basic OBD2 scan tool to clear any stored DTCs from the vehicle’s memory.
With no core charge, you can keep your old part without the hassle of returns. Get back on the road with confidence by ordering your pre-programmed T42 TCM today!
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This Transmission Control Module comes fully programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, eliminating the need for expensive dealership programming or special tools.
Where is the TCM located on my 2006-2009 Pontiac Montana?
On the Pontiac Montana and its platform mates like the Uplander and Terraza, the TCM is typically found in the engine bay, mounted to the driver’s side (LH) strut tower.
Will this part fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. While this module often resolves the root cause that triggers a P0700, you should scan for more specific transmission codes (e.g., P07xx series) to better diagnose the issue. A failing TCM is a very common source of these codes.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide array of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E. This includes many Chevrolet, GMC, Buick, Cadillac, Pontiac, and Saturn models. Please use our vehicle fitment tool to confirm compatibility.
Is there a core charge for this part?
No, we do not require a core charge for this TCM. You can complete your repair without the need to return your old, faulty module.