Restore Your Tahoe’s Drivability and Performance
If your 2007, 2008, or 2009 Chevrolet Tahoe is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a seasoned technician with over two decades of experience, I’ve seen these exact issues countless times. The TCM is the electronic brain of your 4L60E, 4L65E, or 4L70E automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This T42 TCM, part number YNXS, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Tahoe, complaining it would randomly slam into gear and sometimes wouldn’t shift out of 2nd. They’d already replaced a shift solenoid with no luck. A quick scan showed a generic P0700 code and an intermittent solenoid circuit fault. Instead of chasing electrical gremlins for hours, experience pointed straight to the TCM. These modules are known to develop internal circuit failures that cause false solenoid codes. We installed one of our VIN-programmed modules, and in less than 20 minutes, the truck was shifting like new. The customer saved hundreds on diagnostic labor and avoided a trip to the dealer.
Is Your Tahoe Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement. Don’t let a small electronic part lead to a major mechanical failure.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Complete failure to upshift or downshift.
- ✔ A sudden drop in fuel economy.
- ✔ Inconsistent communication with the scan tool or other modules.
Why Our 2007-2009 Tahoe TCM is the Superior Choice
This isn’t just another part; it’s a comprehensive repair solution. The biggest hurdle in replacing a modern module is the programming—we handle that for you. By programming the module with the latest GM software updates tied to your VIN, we ensure it communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. This restores factory shift points, torque converter clutch strategy, and diagnostic accuracy, providing a long-term, reliable fix for your 2007-2009 Tahoe TCM.
DIY-Friendly Installation in Under 30 Minutes
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- ✔ Locate the Module: On the 2007-2009 Tahoe, the TCM is conveniently located in the engine compartment, right next to the battery. You can’t miss it.
- ✔ Perform the Swap: Carefully unplug the electrical connectors from the old TCM. Unbolt the module from its bracket and set it aside. Bolt the new module in its place and securely reconnect the electrical harnesses.
- ✔ Final Steps: Reconnect the negative battery terminal. While not always required, it’s best practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes from the system’s memory.
- ✔ Test Drive: Start the vehicle and take it for a drive to confirm that shifting is smooth and all warning lights are off.
Verified Vehicle Compatibility
While this is the perfect fit for the 2007-2009 Tahoe, this T42 TCM is also compatible with a wide range of other General Motors vehicles. Please verify your model and location below. This part interchanges with numbers 24252114, 24234503, 24230461, and YNXS among others.
- Chevrolet Avalanche 1500 (07-08): Next to battery
- Chevrolet Cobalt (06-10): LH strut tower
- Chevrolet Colorado (08-12): RH rear engine compartment
- Chevrolet Express Vans (06-14): RH engine compartment
- Chevrolet HHR (06-11): LH engine compartment
- Chevrolet Impala (06-11): Lower air cleaner housing
- Chevrolet Malibu (06-10): LH frame rail
- Chevrolet Monte Carlo (06-07): Lower air cleaner housing
- Chevrolet Silverado 1500/2500 (07-13): Next to battery
- GMC Canyon (08-12): RH rear engine compartment
- GMC Envoy (06-09): LH engine compartment
- GMC Savana Vans (06-14): RH engine compartment
- GMC Sierra 1500/2500 (07-13): Next to battery
- GMC Yukon / Yukon XL (07-09): Next to battery
- Cadillac DTS (06-11): RH front engine compartment
- Buick Allure/LaCrosse (06-09): Lower air cleaner housing
- Buick Lucerne (06-11): LH engine compartment
- Hummer H3 (08-10): RH rear engine compartment
- Pontiac G5/G6 (06-10): LH strut tower
- Pontiac Grand Prix (06-08): Lower air cleaner housing
- Saturn Aura (07-09): LH frame rail front
- Saturn Ion (06-07): Behind LH strut tower
- Saturn Vue (07-10): LH front engine compartment
- Saab 9-7X (06-09): LH engine compartment
Frequently Asked Questions
Do I need to take my vehicle to a dealership for programming?
Absolutely not. This module arrives 100% pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time, hassle, and expense of a dealer visit.
Will this fix a P0700 trouble code?
In many cases, yes. The P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. A faulty TCM is a very common cause of this code and other related transmission codes.
Where is the TCM located on a 2007-2009 Tahoe?
The Transmission Control Module on these Tahoe models is located in the engine bay, mounted on a bracket right next to the battery, making it very easy to access for replacement.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of sending it back.
My old module has a different part number. Will this still work?
Yes. This module, YNXS, is a direct replacement for a wide range of GM service numbers, including 24252114, 24234503, 24256960, and many others. It is designed to be fully interchangeable.