Restore Smooth, Reliable Shifting to Your Family’s Minivan
Is your 2006-2009 Pontiac Montana struggling with harsh shifting, delayed gear engagement, or a frustrating check engine light? These are classic signs of a failing Transmission Control Module (TCM), the electronic brain of your automatic transmission. Ignoring these symptoms can lead to more significant damage and unsafe driving conditions. This pre-programmed 24238856 GM T42 TCM is the definitive solution to get your family’s vehicle back on the road with the smooth, predictable performance you can trust.
Common Symptoms & Your Solution
A faulty TCM can turn your daily drive into a stressful experience. If you’re noticing any of the following, it’s time for a replacement:
- Harsh or Erratic Shifting: Abrupt, jerky gear changes that make for an uncomfortable ride.
- Limp Mode: The vehicle is stuck in a single gear (often 2nd or 3rd) with severely limited power.
- Warning Lights: A persistent Check Engine Light or Transmission Warning Light on your dashboard, often with diagnostic trouble codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- Delayed Engagement: A noticeable lag when shifting from Park into Drive or Reverse.
- Poor Fuel Economy: Inefficient shifting patterns can cause your engine to work harder, consuming more fuel.
This module is engineered to resolve these issues directly, restoring communication between your engine and transmission for optimal performance.
Features & Benefits
- ✔ Plug & Play Installation: This module arrives pre-programmed to your vehicle’s specific VIN. This crucial step eliminates the need for expensive dealership programming, allowing for a straightforward installation right out of the box.
- ✔ Restored Driving Confidence: By correcting erratic shifting and limp mode, this TCM restores the smooth, safe operation essential for a family vehicle. Drive with the peace of mind that your transmission is functioning correctly.
- ✔ Lasting Dependability: Built to strict OEM standards, this module is designed for durability and consistent performance, ensuring it can handle the demands of daily driving.
- ✔ The Right Fit, Guaranteed: This unit is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, and 24238856, ensuring perfect compatibility for your repair.
- ✔ Hassle-Free Purchase: No core charge is required, so you don’t have to worry about the cost or inconvenience of sending your old part back.
- ✔ Protected Investment: This unit is backed by our one-year replacement warranty.
From Our Tech Bench: Why VIN Programming is Non-Negotiable
We often get calls from customers who bought a used, non-programmed TCM online, only to find it made their problems worse. A TCM isn’t a simple component; it’s a computer that must be perfectly synced with your vehicle’s unique software, engine parameters, and tire size. Without VIN programming, the module can’t communicate correctly, leading to persistent codes and shifting issues. Our process ensures that your new 24238856 GM T42 TCM is loaded with the latest GM software specific to your Montana, making the installation truly plug-and-play and guaranteeing a successful repair the first time.
Frequently Asked Questions
What does a VIN-programmed TCM mean for me?
It means the module is ready for installation the moment you receive it. We use your vehicle’s VIN to load the exact software and calibrations from GM, so it communicates perfectly with your vehicle’s systems. This saves you a trip to the dealership and the added cost of programming services.
Will this fix my ‘limp mode’ issue?
Yes, in the vast majority of cases, a vehicle stuck in limp mode due to an internal TCM failure will be resolved by replacing it with this correctly programmed unit. It’s one of the most common problems this part is designed to fix.
Is this difficult to install on my Pontiac Montana?
For the 2006-2009 Montana, the TCM is typically located on the LH strut tower, making it accessible in the engine bay. For someone with basic mechanical skills, the installation can often be completed in under 30 minutes. Always disconnect the battery before you begin.
Do I need to send my old part back?
No. We do not require a core charge for this part. You can keep or dispose of your old module without any hassle or extra fees.
Is this compatible with other GM vehicles?
Absolutely. While this listing is focused on the Pontiac Montana, this 24238856 GM T42 TCM is compatible with a huge range of GM cars, trucks, and SUVs from 2006-2014, including the Chevy Impala, GMC Sierra, Saturn Vue, and many more. The critical factor is our VIN programming, which tailors it to your specific model.