Restore Flawless Shifting to Your Chevrolet Tahoe
Is your 2007, 2008, or 2009 Chevy Tahoe suffering from transmission problems? As a mechanic with over two decades of experience, I’ve seen countless SUVs come into the shop with jarring shifts, delayed gear engagement, or a frustrating check engine light. More often than not, the culprit is a failing Transmission Control Module (TCM). This VIN-programmed T42 TCM, also known by part number YNXS, is the definitive solution to get your Tahoe’s transmission operating like new again, without the exorbitant cost and hassle of a dealership visit.
This module is the electronic brain of your 4L60E, 4L65E, or 4L70E automatic transmission. It precisely controls shift points, torque converter lockup, and line pressure. When it fails, communication breaks down, leading to poor performance, reduced fuel economy, and potentially severe transmission damage if left unaddressed. Our module restores that critical communication, ensuring every gear change is smooth and predictable.
A Technician’s Notebook: The Limp Mode Tahoe
A few months back, a customer brought in his ’08 Tahoe, explaining it felt gutless and wouldn’t shift past 3rd gear—a classic case of “limp mode.” His scanner showed a P0700 (Transmission Control System Malfunction) and a solenoid circuit code. After verifying the wiring and solenoids were good, we pinpointed the T42 TCM. Internal circuit failure is common due to heat and vibration. We installed one of our pre-programmed modules, cleared the codes, and had him back on the road in under an hour. He called the next day amazed at how smoothly his Tahoe was driving again. This isn’t just a part; it’s a permanent fix.
Is Your Tahoe Exhibiting These Failure Symptoms?
- ✔ Harsh, erratic, or delayed shifting between gears.
- ✔ The vehicle is stuck in one gear (often 2nd or 3rd, known as “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related codes.
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission seems to be overheating more than usual.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. You don’t need a lift or specialized tools, and the entire process can be completed in your driveway in about 30 minutes. For the 2007-2009 Tahoe, the TCM is conveniently located in the engine bay, typically 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 system.
- Locate the Module: Open the hood and find the TCM mounted next to the battery. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module securely onto the bracket and firmly reconnect the wiring harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reconnect the negative battery terminal. While the system may reset, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes. Start the vehicle and enjoy your restored performance!
Why Our 2007-2009 Tahoe TCM is the Right Choice
This isn’t just another replacement part. It’s a complete solution engineered for reliability and ease of use. We handle the most difficult part for you—the programming. Each module is flashed with the latest GM software and programmed specifically to your vehicle’s VIN before it ships. This ensures 100% compatibility and means you can skip the expensive programming fees at the dealership. Built to meet or exceed OEM specifications and backed by a one-year warranty, it’s a repair you can trust.
Verified Vehicle Compatibility
While this page focuses on the Tahoe, this T42 TCM is compatible with a wide range of GM vehicles. Please verify your model and options below. This module interchanges with part numbers including 24252114, 24234503, 24230461, and YNXS.
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COLORADO 08-12 Transmission; (RH rear 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)
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)
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 other GM cars, trucks, and SUVs.
Frequently Asked Questions
Is this part truly plug-and-play?
Yes. We program the module to your vehicle’s specific VIN before shipping. This eliminates the need for any additional programming or trips to a mechanic for software flashing. It’s ready to install right out of the box.
Where is the TCM located on my 2007-2009 Tahoe?
For this specific model range, the Transmission Control Module is conveniently located in the engine compartment, mounted on a bracket right next to the vehicle’s battery.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module or recycle it locally without any hassle or need to ship it back to us.
What happens if I ignore a failing TCM?
Continuing to drive with a faulty TCM can lead to more serious problems. It can cause excessive wear on clutches and bands, overheating, and eventually lead to catastrophic transmission failure, which is a much more expensive repair.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the TCM itself is the source of the fault. Replacing it with this programmed module is a very common and effective fix for the P0700 code and related transmission performance issues.