Restore Peak Transmission Performance in Your Pontiac Montana
Is your 2006-2009 Pontiac Montana suffering from harsh 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 falters, it can lead to poor drivability, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed. This OEM-quality T42 TCM, part number 24241806, is the definitive solution to restore your vehicle’s factory performance.
From the Diagnostic Bay
We once had a 2008 Montana come into the shop with what the owner described as ‘possessed’ shifting. It would slam into gear one minute and then refuse to shift out of second the next. A local shop had already replaced two shift solenoids, costing the owner hundreds of dollars with no improvement. Our diagnostics pointed directly to the TCM. The internal circuitry had developed intermittent faults, sending erratic signals to perfectly good solenoids. After installing one of our VIN-programmed T42 modules, the van shifted like it just rolled off the assembly line. It’s a powerful reminder that diagnosing the root cause is key, and often, the controller is the real culprit, not the mechanical parts it commands.
Diagnosing Your 2006-2009 Montana TCM
A failing transmission computer can mimic many other mechanical issues, making diagnosis tricky. However, a faulty TCM often presents a specific cluster of electronic symptoms. If your Montana is experiencing any of the issues below, there’s a strong probability that your TCM is the source of the problem. Replacing it with our pre-programmed unit is the most effective way to resolve these persistent transmission woes.
Common Symptoms of a Failing T42 TCM
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky gear changes or a noticeable slam when the transmission shifts.
- ✔ Delayed Engagement: A significant pause after shifting from Park into Drive or Reverse before the gear engages.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift past 2nd or 3rd gear to prevent further damage, resulting in high RPMs at low speeds.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Your mechanic finds codes like 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 caused by the faulty module can lead to a sudden drop in MPG.
- ✔ No Communication: A scan tool is unable to communicate with the transmission control module, indicating a complete failure.
The Plug-and-Play Advantage: VIN Programming Included
Why choose our module? Because we eliminate the most frustrating part of the repair: the trip to the dealership. Every T42 TCM we ship is expertly programmed to your Montana’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the correct software and calibrations for your exact vehicle configuration, including its engine, axle ratio, and tire size. This means no expensive post-installation programming is required. It’s a true plug-and-play solution that saves you time, money, and hassle.
This module is a direct replacement for a wide range of GM service numbers, including 24252114, 24234503, 24230461, 24241806, and more, guaranteeing broad compatibility and OEM-level function across many GM platforms equipped with 4-speed automatic transmissions like the 4L60E and 4L65E.
Simple Installation
For the 2006-2009 Pontiac Montana, the TCM is conveniently located at the driver’s side strut tower in the engine compartment. The replacement process is straightforward for a DIY mechanic or any professional technician.
- Safety First: Disconnect the negative battery terminal to prevent any electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the Module: Find the TCM on the LH (driver’s side) strut tower.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses.
- Reconnect Battery: Reattach the negative battery terminal.
- Final Steps: Start the vehicle. While our programming handles the heavy lifting, it’s good practice to use a scan tool to clear any stored DTCs from the engine and other control modules.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for my Pontiac Montana?
VIN programming means we load the module with the specific software and calibration files from GM that match your vehicle’s unique serial number. This ensures the TCM works perfectly with your Montana’s engine, transmission, and other systems right out of the box, eliminating the need for a dealership visit.
Do I need to have a dealer perform any additional steps after installation?
No. Our module is a complete plug-and-play solution. Because it arrives pre-programmed to your VIN, you do not need to take your vehicle to a dealership for expensive programming. Simply install it, clear any old codes, and you’re ready to drive.
Where is the TCM located on a 2006-2009 Pontiac Montana?
The Transmission Control Module on the ’06-’09 Montana is typically found in the engine bay, mounted to the driver’s side (LH) strut tower. Always confirm the location on your specific vehicle before beginning work.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While this module can resolve the underlying issue causing the P0700, it’s crucial to read the specific transmission codes (e.g., P07xx) to confirm the exact fault. In many cases involving internal TCM failure or solenoid circuit errors originating from the module, this part is the correct fix.
Is there a core charge for this part?
No, there is no core charge required for this transmission control module. You can keep your old part without the hassle of returning it, making the process faster and more convenient for you.