Is Your Montana’s Transmission Acting Up?
If you’re dealing with harsh shifting, a check engine light, or your 2006-2009 Pontiac Montana getting stuck in gear, the problem is very likely a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen this exact issue countless times. The TCM is the brain of your automatic transmission, and when it starts to fail, it can make your reliable minivan feel unpredictable and unsafe. Don’t let a faulty module sideline your vehicle or lead to a costly, unnecessary transmission replacement.
The Direct Solution: A VIN-Programmed Replacement
This T42 Transmission Control Module, part number 24235340, is the definitive fix for these common issues. We take the guesswork and dealer hassle out of the repair. Before we ship it, we program the module to your Montana’s specific Vehicle Identification Number (VIN). This ensures it arrives ready for a true plug-and-play installation, loaded with the latest GM software updates for optimal performance and longevity.
Real-World Diagnostics: A Montana Case Study
“A customer’s 2007 Montana came in last week with a check engine light and what they described as ‘violent’ shifting between first and second gear. They were convinced the transmission was shot and were bracing for a multi-thousand dollar bill. After a quick scan, I found a P0752 code for a stuck shift solenoid. Instead of just replacing the solenoid, I checked the TCM data stream and saw erratic commands. We swapped in a pre-programmed TCM, and the problem was solved in under an hour. That simple module saved them from a massive, unnecessary repair.”
Common Symptoms of a Failing TCM
If you’re experiencing any of the following, a faulty TCM is the likely culprit:
- โ Harsh, slamming, or erratic gear shifts.
- โ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- โ Check Engine Light or Transmission Warning Light is on.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- โ Delayed engagement when shifting from Park to Drive or Reverse.
- โ Poor fuel economy and a feeling of sluggish performance.
Plug-and-Play Installation Guide for the 2006-2009 Montana Transmission Module
You can do this job yourself in your driveway in about 30 minutes. For the Pontiac Montana, the TCM is located at the driver’s side (LH) strut tower in the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Open the hood and find the TCM mounted to the driver’s side strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is pre-programmed, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the vehicle and enjoy smooth shifting!
Guaranteed Fitment and Lasting Reliability
Built to strict OEM specifications, this module is a direct replacement for a wide range of GM part numbers, ensuring perfect compatibility. It’s backed by our one-year warranty for your peace of mind. Restore the smooth, reliable operation of your minivan today.
Replaces Part Numbers: 24235340, 24252114, 24234503, 24230461, 24234274, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.