Restore Your Tahoe’s Transmission Performance
Is your 2007, 2008, or 2009 Chevrolet Tahoe suffering from frustrating transmission problems? If you’re dealing with harsh bangs into gear, a vehicle that won’t shift, or a persistent check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. In my 20+ years of diagnostics, I’ve seen these T42 modules cause countless headaches for owners. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded. This replacement 2007-2009 Tahoe TCM, part number 24243921, is the definitive, no-hassle solution to get your SUV driving like new again.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication breaks down, leading to the symptoms you’re experiencing. Our module comes pre-programmed to your vehicle’s specific VIN, eliminating the need for an expensive and time-consuming trip to the dealership. It’s a true plug-and-play fix designed for both professional technicians and determined DIYers.
Case Study: A Tricky Diagnosis
A customer brought in his ’08 Tahoe, complaining it was stuck in what he called “first gear.” In reality, it was in limp mode, locked in 3rd gear as a failsafe. His local shop had replaced two shift solenoids, but the problem persisted. A quick scan with my tool showed a P0700 (Transmission Control System Malfunction) and an intermittent U0100 (Lost Communication with ECM/PCM). Experience told me this wasn’t an internal transmission failure; it was electronic. The TCM was failing when it got hot. We installed one of these pre-programmed modules, cleared the codes, and the Tahoe was shifting perfectly within 30 minutes. He saved hundreds by avoiding unnecessary internal transmission work.
Is Your Tahoe Showing These Symptoms?
- ✔ Harsh, erratic, or delayed shifting that makes driving uncomfortable.
- ✔ Vehicle stuck in limp mode (typically second or third gear only).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) stored, especially P0700, P0750, or other solenoid-related codes.
- ✔ A complete failure to upshift or downshift, leading to poor acceleration.
- ✔ Decreased fuel economy and potential for transmission overheating.
A Straightforward Guide to Installation
Replacing the 2007-2009 Tahoe TCM is a job most people can handle in their own driveway in under 30 minutes. On these Tahoe models, the module is conveniently located in the engine compartment, right next to the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: Open the hood and find the TCM mounted next to the battery tray.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid damaging the plastic 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. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the negative battery terminal. While the vehicle may run fine immediately, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission fault codes to ensure a clean slate for the new module.
Verified Vehicle Compatibility
While this is a perfect fit for the 2007-2009 Tahoe TCM replacement, this T42 module is also compatible with a wide range of other General Motors vehicles. Please verify your model and options below. This part is interchangeable with service numbers including 24252114, 24234503, 24243901, and more.
This part will fit these makes and models with these options
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
ALLURE 06-09 Transmission; (lower air cleaner housing)
AURA 07-09 Transmission; (LH frame rail front)
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
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)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
RAINIER 06-07 Transmission
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH 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
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
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
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
VUE 10 Transmission
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)
Frequently Asked Questions
What exactly does a Transmission Control Module do?
The TCM is a computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and vehicle, then uses that information to control when the transmission shifts gears, how firmly it shifts, and when the torque converter locks up for better fuel efficiency. A faulty one causes all sorts of shifting chaos.
Is this part really plug-and-play? What does VIN programming mean?
Yes, it’s a true plug-and-play solution. ‘VIN Programming’ means we load the module with the latest GM-approved software that is specific to your vehicle’s Vehicle Identification Number (VIN). This ensures it communicates perfectly with your engine computer and other systems right out of the box, with no dealer intervention required.
Where is the TCM located on a 2008 Chevy Tahoe?
On the 2007-2009 Chevrolet Tahoe and its siblings (Yukon, Suburban, Avalanche), the TCM is conveniently located in the engine compartment. You’ll find it mounted to a bracket right next to the vehicle’s main battery, making it very easy to access.
Do I need to send my old, broken TCM back?
No, there is no core charge for this module. You can keep your old part, which saves you the time and hassle of packaging it up and shipping it back.
Will this fix a P0700 check engine light code?
In many cases, yes. The P0700 code is a generic fault code indicating that the TCM has detected a problem and has requested the check engine light be turned on. If the root cause is the TCM itself failing, replacing it with this programmed unit and clearing the codes will resolve the issue.