Restore Flawless Shifting to Your GMC Yukon
Is your 2007-2009 GMC Yukon suffering from unpredictable, harsh shifting, or getting stuck in gear? A faulty Transmission Control Module (TCM) is often the culprit. As the electronic brain of your 4L60E, 4L65E, or 4L70E transmission, the TCM dictates every gear change. When it fails, drivability and safety are compromised. This T42 TCM, part number 24240449, is the definitive solution, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play repair that gets you back on the road without a costly trip to the dealership.
Is Your Yukon Exhibiting These Transmission Woes?
A failing TCM can manifest in several ways. Over my 20 years in the shop, I’ve seen these symptoms countless times. If you’re experiencing any of the following, a new module is likely the fix you need:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light with codes like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758).
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent loss of communication with the module, causing erratic behavior.
A Technician’s Notebook: The Intermittent Gremlin
A customer brought in their ’08 Yukon complaining of random, hard 1-2 shifts and occasionally getting stuck in 3rd gear after a long drive. No codes were stored initially. We checked the fluid and wiring, which were fine. On a long test drive, the problem finally appeared, along with a P0700 code. The issue was heat-soak affecting the internal circuits of the original T42 TCM. We replaced it with one of our VIN-programmed modules, and the problem was solved instantly. The pre-programming saved the customer a full day and hundreds of dollars compared to a dealership repair.
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is its ease of installation. For most Yukon and Tahoe models, you can have this swapped out in your driveway in under 30 minutes. Here’s a simple guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the vehicle’s electronic systems.
- Locate the Module: On your 2007-2009 Yukon, the TCM is typically mounted in the engine bay, right next to the battery. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. There are usually two or three small bolts holding it in place.
- Install the New Module: Bolt the new, pre-programmed TCM into the same location. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory. Start the engine and enjoy smooth shifting!
Verified Fitment Across a Range of GM Vehicles
While this is a perfect solution for the 2007-2009 Yukon TCM, this versatile T42 module also fits a wide array of other General Motors cars, trucks, and SUVs. Please verify your part number or consult the list below. This module is a direct replacement for part numbers 24252114, 24234503, 24230461, 24240449, and more.
Partial Fitment List:
- GMC Yukon / Yukon XL 1500 (2007-2009)
- GMC Sierra 1500/2500 (2007-2013)
- GMC Savana / Envoy (2006-2014)
- Chevrolet Tahoe / Suburban 1500 (2007-2009)
- Chevrolet Silverado 1500/2500 (2007-2013)
- Chevrolet Avalanche / Express / Trailblazer (2006-2014)
- Cadillac DTS / Escalade (check specific options)
- Hummer H3 (2008-2010)
- And many more Buick, Pontiac, and Saturn models.
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, just like an original part from the dealer, but without the programming fee.
Do I need to send my old TCM back (core charge)?
No, there is absolutely no core charge. You can keep your old part, so you won’t have to worry about the hassle or expense of shipping it back to us.
Is this a difficult part for a DIYer to install?
Not at all. For most compatible vehicles like the GMC Yukon, this is one of the easier electronic components to replace. It’s typically located in the engine bay and requires only basic hand tools. Our installation guide above outlines the simple process.
Will this fix a P0700 check engine light code?
If the P0700 code is being triggered by an internal failure of the TCM itself, then yes, this part is the correct fix. P0700 is a general code indicating a fault in the transmission control system; this module is the heart of that system.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.