Restore Peak Performance to Your Pontiac Montana’s Transmission
Is your 2006-2009 Pontiac Montana suffering from erratic shifting, getting stuck in gear, or displaying a persistent check engine light? These frustrating issues often point directly to a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for executing smooth, efficient gear changes. When it fails, drivability is compromised. This genuine OEM-quality T42 TCM, part number 24239926, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We had a 2008 Montana come into the shop that the owner was convinced needed a full transmission rebuild. It was stuck in 3rd gear—classic limp mode—and shifting manually was impossible. The dash was lit up with warnings. After hooking up the scanner, we saw a P0700 code and several solenoid circuit faults. Instead of quoting a multi-thousand dollar rebuild, we checked the TCM. After swapping in a VIN-programmed module like this one, all the codes cleared, and the van shifted perfectly on the test drive. The customer saved a fortune by correctly diagnosing the electronic failure first.
Common Symptoms of a Failing Montana TCM
- ✔ Harsh or Erratic Shifting: Experiencing sudden jerks, clunks, or hesitation between gears.
- ✔ Stuck in Limp Mode: The transmission defaults to a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light illuminates on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific faults (e.g., P0750, P0753, P0758).
- ✔ Poor Fuel Economy: Inefficient shifting patterns cause the engine to work harder, consuming more fuel.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ No Upshift or Downshift: The vehicle fails to shift into higher or lower gears as needed.
Why Choose Our Pre-Programmed 2006-2009 Montana TCM?
This isn’t just a replacement part; it’s a complete solution designed to get your vehicle back on the road quickly and reliably. Our 2006-2009 Montana TCM is meticulously prepared to meet and exceed original factory specifications. The critical advantage is our VIN programming service. We flash the module with the latest GM software updates specific to your Montana’s VIN before it ships. This eliminates the need for expensive trips to the dealership for programming, saving you time and money. Simply install the module, and you’re ready to go.
Installation and Compatibility
For the Pontiac Montana and other GM minivans like the Uplander and Terraza, the TCM is typically located on the driver’s side (LH) strut tower in the engine bay, making it accessible for a straightforward replacement. The process generally takes less than 30 minutes. Always disconnect the battery before starting the job to ensure the vehicle’s electrical system is reset. After installation, use a standard OBD2 scan tool to clear any stored fault codes.
This module is a direct replacement for a wide range of part numbers, including: 24252114, 24234503, 24230461, 24234274, 24239926, 24240400, 24256960, and more. It ensures broad compatibility across many GM vehicles equipped with 4-speed automatic transmissions like the 4L60E and 4L65E.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do in my Montana?
The TCM is a computer that acts as the ‘brain’ for your automatic transmission. It collects data from various sensors on the engine and transmission to control shift points, line pressure, and torque converter lockup, ensuring smooth and efficient operation.
What does ‘VIN Programmed’ mean for me?
It means the module arrives at your door ready for immediate installation. We use your vehicle’s Vehicle Identification Number (VIN) to load the correct factory software and calibrations onto the TCM. This bypasses the need for expensive and time-consuming programming at a dealership.
Can I install this module myself?
Yes, this is a common DIY repair. The TCM on a 2006-2009 Montana is located on the LH strut tower. With basic hand tools, the replacement can typically be completed in under 30 minutes. Remember to disconnect the battery before you begin.
Will this part fix a P0700 error code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you are experiencing shifting problems along with the P0700 code, replacing the TCM is the most likely solution.
Is there a core charge or do I need to return my old part?
No, there is no core charge for this module. You can keep your old part, avoiding the hassle and expense of return shipping.