Restore Smooth Shifting to Your 2007-2009 GMC Yukon
If you’re dealing with the frustration of a GMC Yukon that shifts harshly, gets stuck in gear, or throws transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline an otherwise reliable truck. This OEM-quality T42 TCM, part number 24241806, is the definitive solution for restoring the precise, factory-new performance of your vehicle’s automatic transmission. The most critical benefit? It arrives at your door fully programmed to your vehicle’s VIN, eliminating the need for an expensive trip to the dealership for programming. This is a true plug-and-play fix.
A Technician’s Notebook: The Intermittent Limp Mode Case
A customer brought in a 2008 Yukon complaining of intermittent ‘limp mode’—the truck would suddenly refuse to shift past 2nd gear, but the problem would vanish after restarting the engine. No consistent codes were stored, just a generic P0700 (Transmission Control System Malfunction) now and then. After checking the wiring harness and solenoids, which all tested fine, we focused on the TCM. These modules can suffer from internal heat stress, causing intermittent connection failures that don’t always throw a specific code. We installed a VIN-programmed 2007-2009 Yukon TCM, and the problem was solved instantly. The pre-programming saved us hours of diagnostic and programming time, getting the customer back on the road safely and efficiently.
Is Your Yukon Exhibiting These Transmission Issues?
A faulty TCM is the brain of your transmission, and when it fails, the symptoms are hard to ignore. Watch for these common indicators:
- ✔ Harsh, banging, or erratic gear shifts.
- ✔ The vehicle is stuck in one gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor fuel economy and a feeling of lost power.
- ✔ Complete failure to shift gears.
Your Straightforward 30-Minute Installation Guide
Getting your Yukon back in top shape is easier than you think. This module is designed for a direct-fit replacement. For most 2007-2009 Yukon models, the TCM is located in the engine bay, typically next to the battery. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system’s memory.
- Locate the Old Module: Find the TCM in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that may need to be pressed or lifted. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical connectors, ensuring they click 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 stored fault codes from the vehicle’s memory. Start the engine and enjoy smooth shifting!
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24241806 and is interchangeable with many other service numbers. It provides a reliable fix for a wide range of GM trucks, SUVs, and cars equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While it’s a perfect fit for the 2007-2009 Yukon TCM requirement, it also fits many other models. Please see the detailed list below to confirm compatibility.
This part will fit these makes and models with these options
YUKON 07-09 Transmission; (next to battery)
ENVOY 08-09 Transmission; (LH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
G5 07-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
TAHOE 07-09 Transmission; (next to battery)
And many more…
Frequently Asked Questions
Do I need to take my truck to the dealer after installing this?
No! The main benefit of this module is that it comes pre-programmed to your vehicle’s specific VIN. This means you can install it yourself and it will work immediately, with no additional programming or calibration required.
What tools do I need for installation?
Installation is very straightforward. You will typically only need a basic socket set to unbolt the old module and a flathead screwdriver to help release the connector clips. The entire process usually takes less than 30 minutes.
Is this a new or used part?
This is an OEM-quality replacement part, built to meet or exceed original factory specifications for performance and reliability. It is backed by our one-year warranty for your peace of mind.
Will this fix a P0700 code on my Yukon?
A P0700 code is a general transmission fault request, meaning the TCM has detected a problem and asked the main computer to turn on the check engine light. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you are also experiencing shifting problems, replacing the TCM is the most likely solution.
What is a T42 TCM?
T42 is the hardware platform designation used by GM for this generation of 4-speed automatic transmission control modules. It’s the standard controller for transmissions like the 4L60E and 4L70E found in millions of GM vehicles from this era.