Restore Your Yukon’s Shifting Performance
If you’re dealing with a 2007-2009 GMC Yukon that’s slamming into gear, refusing to shift, or has its check engine light glaring at you, the culprit is often a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by these exact issues. A faulty TCM doesn’t just make for a rough ride; it can lead to poor fuel economy, transmission damage, and leave you stranded. This T42 TCM, part number 24234503, is the reliable, pre-programmed solution to get your vehicle back to driving smoothly and dependably.
This isn’t just a replacement part; it’s a complete fix. We handle the most critical step for you: VIN programming. Before this module ships, we flash it with the latest GM software specific to your Yukon’s Vehicle Identification Number. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a plug-and-play installation, saving you time, money, and hassle. This is the same process we use in the shop to ensure a perfect handshake between the new module and your vehicle’s systems, clearing persistent diagnostic trouble codes (DTCs) and restoring factory-level performance.
Is Your Yukon’s Transmission Acting Up? Check for These Signs
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention. I’ve diagnosed hundreds of these, and the symptoms are often consistent across the GM platform.
- âś” Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- âś” The vehicle is stuck in “limp mode,” often locked in 2nd or 3rd gear, with limited power.
- âś” Check Engine Light or Transmission Warning Light is illuminated on your dash.
- âś” Your scan tool shows transmission-related DTCs, such as the generic P0700 or specific solenoid codes like P0750.
- âś” A noticeable drop in fuel efficiency as the transmission isn’t operating in the optimal gear.
- âś” Complete loss of communication with the module, leading to a no-start or no-shift condition.
A Technician’s Notebook: The Case of the Hesitant Sierra
A customer brought in his ’08 Sierra 1500, a work truck he depended on daily. His complaint was intermittent but severe: sometimes it would shift perfectly, other times it would bang into gear so hard it felt like he’d been rear-ended. He’d already replaced a shift solenoid with no luck. After connecting my scanner, I saw a P0700 code and a history of communication loss with the TCM. Instead of throwing more parts at it, we inspected the TCM. On these trucks, it’s located right next to the battery, where it’s exposed to heat cycles and potential acid vapor. We swapped in a VIN-programmed T42 module, and the problem was solved instantly. The truck shifted like new. It’s a classic failure scenario that this part is designed to fix permanently.
A Straightforward Guide to Installation
Replacing the 2007-2009 Yukon Transmission Control Module is a job most DIYers can handle in their own driveway in under 30 minutes. The location on most Yukon, Tahoe, and Sierra models is conveniently in the engine bay, right next to the battery.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: Open the hood and find the module. On your Yukon, it’s typically mounted on a bracket right next to the battery.
- Disconnect the Connectors: Carefully unclip the electrical wiring harnesses from the old module. There are usually two or three connectors with locking tabs.
- Remove the Old Module: Unbolt the module from its mounting bracket. A simple socket set is all you’ll need.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored DTCs. Take a test drive to confirm the smooth shifting.
Confirmed Vehicle Compatibility List
This T42 TCM is a direct replacement for part number 24234503 and other service numbers listed below. It fits a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Please verify your model and year below.
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS
Fits Models Including:
- âś” GMC Yukon / Yukon XL 1500 (2007-2009)
- âś” Chevrolet Tahoe / Suburban 1500 (2007-2009)
- âś” Chevrolet Silverado 1500 (2007-2013)
- âś” GMC Sierra 1500 (2007-2013)
- âś” Cadillac DTS (2006-2011)
- âś” Hummer H3 (2008-2010)
- âś” Chevrolet Impala (2006-2011)
- âś” And many other GM cars, trucks, and SUVs from 2006-2014. Refer to the detailed fitment list for specifics.
What exactly does VIN programming do?
What exactly does VIN programming do?
VIN programming loads your vehicle’s specific software and calibrations onto the module before it ships. This ensures the TCM works perfectly with your engine, transmission, and other electronic systems, eliminating the need for a dealership visit.
Is this a difficult part to install myself?
Not at all. For a 2007-2009 Yukon, the TCM is located next to the battery and is accessible with basic hand tools. The entire process typically takes less than 30 minutes, making it a great DIY-friendly repair.
Will this part fix my P0700 check engine light code?
Yes, in most cases. A P0700 code is a general fault request from the TCM. If the TCM itself is the source of the problem, replacing it with this pre-programmed unit will resolve the underlying issue and allow the code to be cleared.
Do I need to send my old part back?
No, there is no core charge for this module. You can keep your old part or dispose of it, offering a hassle-free purchasing experience.
What kind of warranty is included?
This Transmission Control Module comes with a one-year warranty, giving you peace of mind and confidence in the quality and durability of your repair.