Restore Your Yukon’s Smooth Shifting Performance
Is your 2007, 2008, or 2009 GMC Yukon suffering from erratic shifting, getting stuck in gear, or displaying a persistent check engine light? These are classic signs of a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can mimic a major transmission failure, leading to stress and costly misdiagnoses. This T42 TCM, part number 24235732, is the direct, reliable solution to restore your vehicle’s drivability and peace of mind.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your vehicle’s specific VIN, ensuring it communicates perfectly with your Yukon’s powertrain right out of the box. This critical step eliminates the need for an expensive trip to the dealership for programming, saving you time and hundreds of dollars. By precisely managing shift points, torque converter clutch engagement, and fluid pressure, this module resolves the root cause of many frustrating transmission issues.
A Technician’s Notebook: The Misleading P0700 Code
I remember a 2008 Yukon that came into my shop. The owner was frustrated; his truck was slamming into gear and occasionally wouldn’t shift past 3rd. The dashboard was lit up with a check engine light, and a generic code reader showed only a P0700 (Transmission Control System Malfunction). This code is often just a messenger, telling you the TCM has detected a problem. After connecting my professional scan tool, I found underlying solenoid circuit codes. While some might jump to replacing solenoids, my experience with these GM platforms pointed directly to the T42 TCM. The internal electronics had failed from years of heat cycles. We installed a VIN-programmed module, and in less than 30 minutes, the truck was shifting like new. It’s a prime example of how the right part saves you from chasing phantom issues.
Is Your Yukon Exhibiting These Telltale Signs?
- ✔ Unpredictable or harsh gear changes that slam or jerk the vehicle.
- ✔ The transmission feels like it’s slipping or failing to engage properly.
- ✔ Your Yukon is stuck in “limp mode,” often locking you into 2nd or 3rd gear.
- ✔ The Check Engine Light or Transmission Warning Light is on, with codes like P0700, P0750, P0753, or other solenoid-related DTCs.
- ✔ A noticeable drop in fuel economy or the transmission seems to be running hotter than usual.
- ✔ Complete loss of communication with the transmission module.
Your Straightforward 30-Minute Installation Guide
Replacing the TCM on your Yukon is a job most DIYers can handle with basic tools. The module is typically located in the engine bay next to the battery. Follow these simple steps to get back on the road quickly.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On most 2007-2009 Yukon models, you’ll find the TCM mounted right next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting 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 battery terminal. While the module is plug-and-play, it’s always best practice to use a scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Fitment For These GM Vehicles
While this is the primary solution for the 2007-2009 Yukon TCM, this versatile T42 module is also compatible with a wide range of other General Motors cars, trucks, and SUVs. It is a direct replacement for part numbers including 24252114, 24234503, 24242391, and others listed in the interchange data. Please verify your vehicle in the list below.
- GMC Yukon: 2007, 2008, 2009 (next to battery)
- GMC Yukon XL 1500: 2007-2008 (next to battery)
- GMC Sierra 1500/2500: 2007-2013 (next to battery, specific options apply)
- Chevrolet Tahoe / Suburban 1500: 2007-2009 (next to battery)
- Chevrolet Silverado 1500/2500: 2007-2013 (next to battery, specific options apply)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- And many more… (see full list)
Frequently Asked Questions
What exactly does this Transmission Control Module do?
The TCM acts as the brain for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses that information to control shift timing, line pressure, and torque converter lockup for optimal performance and fuel efficiency.
Do I really not need to go to the dealer for programming?
That’s correct. We handle the programming for you before we ship the part. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for plug-and-play installation, saving you significant time and money.
Where is the TCM located on my 2008 GMC Yukon?
On the 2007-2009 GMC Yukon, the TCM is almost always located in the engine compartment, mounted on a bracket right next to the battery. Its accessibility makes for a quick and easy replacement.
Will this part fix a P0700 trouble code?
In many cases, yes. A P0700 code indicates the TCM has detected a fault. If the root cause is an internal failure of the TCM itself (which is very common), replacing it with this programmed unit will resolve the issue and allow the code to be cleared.
Is there a core charge for this part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it, making the repair process even simpler.