Restore Flawless Shifting to Your GMC Yukon
If you’re dealing with the frustration of a GMC Yukon that shifts harshly, gets stuck in gear, or throws transmission-related trouble codes, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless GM trucks and SUVs sidelined by a faulty Transmission Control Module (TCM). The T42 module, the brain of your 4L60E or 4L65E transmission, is a common failure point, but the fix is more straightforward than you might think. This isn’t just a part; it’s a direct solution to get your truck’s performance and reliability back where it should be.
This OEM-quality T42 TCM, part number 24235340, arrives at your door fully programmed to your vehicle’s specific VIN. This crucial step eliminates the need for an expensive trip to the dealership for programming. You get a component that’s ready for immediate installation, loaded with the latest GM software updates to ensure optimal communication between your engine and transmission. It’s the definitive fix for the issues plaguing your vehicle, restoring the smooth, predictable shifting you depend on.
Case Study: A Tricky Diagnosis
I once had a 2008 Yukon in the bay with a complaint of intermittent ‘no-shift’ conditions and a P0700 code. The owner was convinced his transmission was failing and was bracing for a multi-thousand-dollar bill. After checking the fluid and performing a pressure test, everything seemed mechanically sound. The scanner, however, showed intermittent communication loss with the TCM. Instead of a full transmission replacement, we swapped in a pre-programmed T42 module. The total repair time was under an hour, and the truck has been shifting perfectly ever since. It’s a prime example of how diagnosing the electronics first can save thousands.
Is Your Yukon Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a catastrophic failure. Often, the symptoms start small and become progressively worse. If you’re noticing any of the following, your 2007-2009 Yukon TCM is the most likely culprit:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear, often 2nd or 3rd (known as “limp mode”).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as P0700 (Transmission Control System Malfunction), P0750-series solenoid codes, or U-series communication codes.
- ✔ Inability to upshift or downshift correctly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
A Straightforward Guide to a 30-Minute Install
One of the best features of this module is its ease of installation. You don’t need a vehicle lift or specialized tools. For a 2007-2009 GMC Yukon, the process is incredibly simple.
- Safety First: Always begin by disconnecting the negative terminal on your vehicle’s battery. This prevents any electrical shorts and helps reset the vehicle’s computer systems.
- Locate the Module: On your Yukon, the TCM is conveniently located in the engine bay, right next to the battery. You can’t miss it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. They have locking tabs that need to be released. Once unplugged, unbolt the module from its bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug in the electrical connectors, ensuring they click to confirm a solid connection.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD-II scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and take it for a test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
While this page focuses on the 2007-2009 Yukon TCM, this module is a direct replacement for a wide range of GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24230461, and more. Please see the comprehensive list below to verify your specific application.
This part will fit these makes and models with these options:
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
YUKON 07 Transmission; (next to battery)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
… and many more GM models.
Frequently Asked Questions
Is this module truly plug-and-play?
Yes. We program the module to the VIN you provide during checkout. This ensures it has the correct software for your vehicle’s specific configuration, allowing for immediate installation without any additional programming.
Where is the TCM located on my 2008 GMC Yukon?
For the 2007-2009 GMC Yukon, as well as similar models like the Tahoe and Silverado, the Transmission Control Module (TCM) is located in the engine compartment, mounted on a bracket right next to the battery.
Do I need to return my old TCM? Is there a core charge?
No. We do not require you to return your old part. There is absolutely no core charge, saving you the time and hassle of shipping your old module back.
What kind of warranty comes with this part?
This module is backed by our one-year warranty, giving you peace of mind that you’re installing a quality, reliable component in your vehicle.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the Check Engine Light to be turned on. Often, a failing TCM is the root cause of the specific, underlying codes that trigger the P0700. Replacing the TCM is a very common and effective fix for this situation.
How do I provide my vehicle’s VIN for programming?
You can enter your 17-digit Vehicle Identification Number (VIN) during the checkout process. This ensures we can program the module accurately before shipping it to you.