Is Your Pontiac Montana Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your 2006-2009 Pontiac Montana is stuck in 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 orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can cause a host of frustrating and potentially damaging issues, from poor fuel economy to a complete inability to shift gears. This replacement T42 TCM is the definitive solution, engineered to restore your vehicle’s original performance and reliability.
From the Diagnostic Bay
We had a 2008 Chevy Uplander (which shares the same platform as the Montana) come into the shop with the check engine light on and a complaint of it banging into gear. The customer was worried about a costly transmission rebuild. We pulled the codes and found a P0752 for Shift Solenoid ‘A’ Stuck On. While it could have been the solenoid itself, experience with these GM 4-speed automatics pointed us toward the TCM. The internal drivers for the solenoids often fail. We installed one of our VIN-programmed T42 modules, cleared the codes, and the van shifted perfectly on the test drive. It’s a common issue, and replacing the module is a straightforward fix that saved the customer thousands compared to a new transmission.
Why Our Pre-Programmed Montana Transmission Control Module is the Superior Choice
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle when replacing a modern electronic module is the need for expensive and time-consuming dealership programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module with the latest GM-certified software specific to your Pontiac Montana. This ensures that it communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. Simply install the module, and you’re ready to go.
Symptoms of a Failing T42 TCM
- ✔ Hard, jerky, or erratic shifting between gears.
- ✔ The vehicle gets stuck in one gear (often 2nd or 3rd), known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Complete loss of shifting capability.
Simple, DIY-Friendly Installation
You don’t need to be a master mechanic to replace this module. On the 2006-2009 Pontiac Montana, the TCM is conveniently located on the driver’s side, attached to the strut tower in the engine compartment. The process is simple:
- Safety First: Disconnect the negative terminal of your vehicle’s battery.
- Locate the TCM: Find the module on the driver’s side strut tower.
- Disconnect Connectors: Carefully unplug the electrical connectors from the old module.
- Remove Old Module: Unbolt the old TCM from its mounting bracket.
- Install New Module: Bolt the new, pre-programmed module in place and securely reconnect the electrical connectors.
- Final Steps: Reconnect the battery terminal. It’s recommended to use a basic OBD2 scan tool to clear any stored transmission codes after installation.
This part is a direct replacement for multiple service numbers, including 24252114, 24234503, 24230461, 24235754, and more, ensuring broad compatibility across a wide range of GM vehicles. Restore the precise, smooth shifting your vehicle had when it was new. Order today and get your Montana back on the road with confidence.
Frequently Asked Questions
What does a VIN-programmed TCM mean?
It means we load the module with the specific software and calibration files from General Motors that match your vehicle’s exact year, model, and options. This makes the part plug-and-play, allowing it to work correctly without any additional programming from a dealership.
Do I need to take this part to a dealer after installation?
No. Because the module is pre-programmed to your VIN, you do not need to visit a dealer or mechanic for programming. Installation is a direct swap, saving you time and money.
What are the main signs my Montana’s TCM is failing?
The most common symptoms are harsh or unpredictable shifting, the vehicle being stuck in a single gear (limp mode), and the illumination of the check engine or transmission warning light with transmission-related fault codes.
Where is the TCM located on a 2006-2009 Pontiac Montana?
The Transmission Control Module on this model is typically located in the engine bay, attached to the driver’s side (LH) strut tower, making it easily accessible for replacement.
Is there a core charge for this module?
No, we do not require a core charge for this part. You can keep your old module without the hassle of returning it.