Is Your Pontiac Montana Experiencing Transmission Troubles?
If you’re dealing with erratic shifting, a check engine light that won’t go away, or your 2006-2009 Pontiac Montana suddenly going into limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for managing gear shifts, fluid pressure, and torque converter operation. When it fails, it can cause a host of frustrating and potentially damaging issues, making your vehicle unreliable and unsafe to drive.
This OEM-quality T42 Transmission Control Module, part number 24243901, is the definitive solution to restore your vehicle’s performance. It arrives expertly programmed to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation without any need for expensive dealership visits or special programming tools. Get your van shifting smoothly and reliably again.
From the Diagnostic Bay
We had a 2008 Montana come into the shop with classic symptoms of a failing transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear. The owner had already spent a small fortune replacing shift solenoids based on a generic code reader’s output, but the problem persisted. After a quick scan with professional equipment, we pinpointed the real issue: intermittent communication failure from the TCM. The solenoids were fine; the module telling them what to do was faulty. We installed one of our VIN-programmed T42 modules, and within 30 minutes, the van was shifting like it just rolled off the factory floor. It’s a textbook case of how a faulty module can mimic mechanical failure, and why replacing the TCM is often the correct first step.
Common Symptoms of a Failing 2006-2009 Montana TCM
- ✔ Harsh or Erratic Shifting: Experiencing hard clunks when shifting between gears, or delayed, slipping shifts.
- ✔ Stuck in Gear / Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid errors), or other transmission-related faults.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up can lead to a noticeable decrease in gas mileage.
- ✔ No Communication: A scan tool may be unable to communicate with the transmission module, indicating a complete failure.
The Plug-and-Play Advantage: Pre-Programmed for Your Vehicle
Don’t waste time and money at a dealership. This module is not a blank slate; it’s a fully prepared solution. We use the latest GM software updates to program the module with your vehicle’s unique VIN before it ships. This critical step ensures that the TCM communicates perfectly with your engine computer and other vehicle systems right out of the box. It resolves common software-related DTCs and optimizes shift points and transmission behavior for your specific vehicle, restoring its original performance and efficiency.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, 24243901, and more, making it a versatile and reliable choice for your repair.
Installation and Fitment
For the 2006-2009 Pontiac Montana, the TCM is conveniently located on the LH (driver’s side) strut tower in the engine compartment, making for a straightforward replacement. The process typically takes less than 30 minutes. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. No core charge means you can keep your old part without any hassle.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming is the process of loading your vehicle’s specific software and calibration files onto the TCM. This ensures the module works perfectly with your Montana’s engine, options, and tire size, providing optimal shift quality and performance without any additional setup.
Will this module fix a P0700 error code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (the faulty TCM itself), it’s essential to ensure there are no underlying mechanical issues. In most cases where the module is failing, replacing it will clear the P0700 and related codes.
Is this a difficult part to install myself?
For most DIY mechanics, this is a very manageable job. On the Pontiac Montana, the TCM is easily accessible on the driver’s side strut tower. Basic hand tools are all that’s required. The key is that our pre-programming eliminates the most difficult step—the software setup.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep, discard, or recycle your old module without any obligation to send it back to us.
How can I be sure this fits my vehicle?
This module is guaranteed to fit 2006-2009 Pontiac Montana models. It also fits a wide range of other GM vehicles. You can confirm compatibility by matching your original part number to 24243901 or one of the other service numbers listed in the description.