Restore Smooth, Reliable Shifting to Your GMC Yukon XL 1500
If your 2007-2008 GMC Yukon XL 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes, the culprit is very often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the T42 TCM governs every gear change and torque converter operation. When it fails, drivability and safety are compromised. This OEM-quality, VIN-programmed replacement module is the definitive solution to get your truck’s transmission performing like new again, without a costly and time-consuming trip to the dealership.
A Technician’s Notebook: The Overlooked Culprit
I remember a 2008 Yukon XL that came into my bay with a classic complaint: “It slams into gear and sometimes won’t shift past second.” The owner had already replaced a shift solenoid with no luck. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid code. In my 20+ years of experience, I’ve learned that on these GM platforms, the TCM itself is a common point of failure. Constant heat cycles and engine vibration in its location next to the battery eventually take a toll on the internal circuits. We installed one of our pre-programmed T42 modules, cleared the codes, and the truck was shifting perfectly on the test drive. It’s a repair that saves customers from chasing phantom electrical gremlins.
Is Your Yukon Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching the symptoms early can prevent further damage. Look out for these common indicators:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light is on with codes like P0700, P0750, P0755, or other solenoid-related DTCs.
- ✔ Failure to upshift or downshift properly.
- ✔ A sudden, unexplained drop in fuel economy.
- ✔ The transmission seems to slip out of gear.
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is its simple, plug-and-play installation. Because we program it to your vehicle’s VIN before shipping, you can perform this repair right in your driveway. For the 2007-2008 Yukon XL 1500 TCM, the module is typically located right next to the battery in the engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic component replacement.
- Locate the Module: Find the TCM mounted in the engine bay, usually next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the 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.
Verified Fitment for Your General Motors Vehicle
This T42 TCM, part number 24239224, is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24230461, and more. Please verify your specific model below:
- GMC YUKON XL 1500 (2007-2008) – Transmission; (next to battery)
- Chevrolet Avalanche 1500 (2007-2008) – Transmission; (next to battery)
- Chevrolet Silverado 1500 Pickup (2007-2013) – Transmission; (next to battery), various options
- Chevrolet Tahoe (2007-2009) – Transmission; (next to battery), various options
- GMC Sierra 1500 Pickup (2007-2013) – Transmission; (next to battery), various options
- GMC Yukon (2007-2009) – Transmission; (next to battery), various options
- Cadillac DTS (2006-2011) – Transmission; (RH front engine compartment)
- Chevrolet Impala (2006-2011) – Transmission; (lower air cleaner housing)
- Hummer H3 (2008-2010) – Transmission; (RH rear engine compartment)
- …and many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means this module arrives ready for installation. We flash it with your vehicle’s specific VIN and the latest GM software, so it communicates perfectly with your engine and other systems right out of the box. You do not need to pay for dealership programming.
Is this a difficult part to install for a DIYer?
Not at all. For most vehicles like the Yukon XL 1500, it’s a very straightforward job requiring only basic hand tools. Since it’s located in the engine bay and not inside the transmission, the process usually takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal shorts or logic failure), you should ensure there are no underlying wiring or solenoid issues. However, a faulty TCM is the most common reason for this code on these vehicles.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process simpler and hassle-free.
What is the warranty on this 2007-2008 Yukon XL 1500 TCM?
This part is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.