Is your 2006-2009 Pontiac Montana struggling with transmission problems?
If you’re dealing with erratic shifting, getting stuck in gear, or seeing a persistent check engine light, a faulty Transmission Control Module (TCM) is likely the culprit. 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 cause a host of frustrating and potentially damaging issues. This genuine GM T42 Transmission Control Module, part number 24243921, is the definitive solution to restore your vehicle’s performance and reliability.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before shipping. This critical step ensures perfect communication between the TCM and your Montana’s other electronic systems, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play fix designed to get you back on the road quickly and confidently.
From the Diagnostic Bay
We had a 2008 Montana come into the shop with classic transmission failure symptoms: harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already spent a significant amount of money at another shop that replaced two shift solenoids and performed a fluid flush, but the problem persisted. After a quick scan, we saw a generic P0700 code and a few specific solenoid circuit codes. Experience told us that multiple, intermittent solenoid codes often point away from the solenoids themselves and toward the module that controls them. We installed one of our VIN-programmed T42 TCMs. The entire job took less than 30 minutes. After clearing the codes, the van shifted perfectly. The customer could have saved hundreds of dollars and a lot of headaches by addressing the core electronic issue first.
Symptoms of a Failing Pontiac Montana TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear, often referred to as “limp mode,” to prevent further damage.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other transmission-related solenoid codes are stored.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete failure to shift gears, leaving you stranded.
Why Choose Our Programmed 2006-2009 Montana TCM?
This module is a direct-fit replacement for your original unit, designed to meet or exceed OEM specifications. By providing your VIN at checkout, you receive a module loaded with the latest GM software updates specific to your vehicle. This ensures optimal shift points, torque converter lockup strategy, and fuel efficiency. It directly resolves common electronic failures within the original T42 modules, offering a durable and dependable long-term solution. Installation is straightforward for any competent DIY mechanic or professional technician.
Simple Installation Process
For the 2006-2009 Pontiac Montana, the TCM is conveniently located on the LH (driver’s side) strut tower in the engine compartment. The process is simple:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on vehicle electronics.
- Locate and Remove: Identify the TCM on the driver’s side strut tower. Disconnect the electrical connectors and unbolt the module from its bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses.
- Reconnect Battery & Clear Codes: Reconnect the battery. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes.
- Test Drive: Take your Montana for a drive to confirm that shifting has returned to normal.
With no core charge, you don’t have to worry about the hassle and expense of sending your old part back. You are purchasing a quality-tested component backed by our one-year warranty for your peace of mind.
Frequently Asked Questions
What is VIN programming and why is it required?
VIN programming loads your vehicle’s specific software and calibration files onto the TCM. This ensures it communicates correctly with the Engine Control Module (ECM) and other systems. Without it, the transmission will not function correctly. Our service saves you a costly trip to the dealer for this essential step.
Will this TCM fix a P0700 trouble code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, the fault is internal to the TCM itself. While this module is a common fix for a P0700 accompanied by other transmission codes, you should ensure the transmission wiring and solenoids are in good condition.
Where is the TCM located on a 2006-2009 Pontiac Montana?
The Transmission Control Module on this specific vehicle is located in the engine bay, mounted to the driver’s side (LH) strut tower, making it easily accessible for replacement.
Do I need to send my old part back? Is there a core charge?
No. We do not require you to return your old module. This part is sold without a core charge, saving you time and return shipping costs.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills and tools, this is a straightforward installation that typically takes under 30 minutes. Its accessible location and our pre-programming make it a great DIY-friendly repair.