Restore Your Tahoe’s Shifting Performance
If your 2007, 2008, or 2009 Chevrolet Tahoe is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by this exact issue. A faulty TCM doesn’t just make for an unpleasant drive; it can cause poor fuel economy and lead to more significant transmission damage if ignored. This T42 series module, part number 24235754, is the definitive solution to get your vehicle’s automatic transmission operating like new again.
The biggest headache with replacing a TCM has always been the need for expensive dealership programming. We eliminate that step entirely. By providing your vehicle’s VIN during checkout, we program the module specifically for your Tahoe. This means it arrives at your door ready for a true plug-and-play installation, pre-loaded with the latest GM software updates. You get a reliable, OEM-spec part that communicates flawlessly with your vehicle’s powertrain, right out of the box.
A Technician’s Notebook: The Limp Mode Tahoe
A customer brought in their ’08 Tahoe, complaining it wouldn’t shift past 3rd gear—a classic case of ‘limp mode.’ The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of immediately quoting a costly internal transmission repair, I checked the TCM. These T42 modules are known to fail internally, causing erratic signals to the solenoids. We swapped in one of our pre-programmed modules, cleared the codes, and took it for a test drive. The shifting was immediately crisp and correct. The customer saved hundreds, possibly thousands, by correctly diagnosing the electronic failure first. This is the most common fix for these symptoms.
Is Your Tahoe’s Transmission Acting Up? Check for These Signs
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode) and will not upshift or downshift.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0753, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission feels like it’s slipping between gears.
Get Your Tahoe Shifting Smoothly: A 30-Minute Install Guide
Replacing the 2007-2009 Tahoe Transmission Control Module is a straightforward job that most DIYers can handle in their own garage. No specialized tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most 2007-2009 Tahoes, the TCM is located in the engine bay, right next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored transmission codes. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 TCM is a direct replacement for part number 24235754 and is interchangeable with many other service numbers. While this page focuses on the 2007-2009 Tahoe, this part also fits a wide range of other GM vehicles, including:
- Chevrolet: Tahoe (07-09), Silverado (07-13), Suburban (07-08), Express Van (06-14), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado (08-12)
- GMC: Yukon / Yukon XL (07-09), Sierra (07-13), Savana Van (06-14), Envoy (06-09), Canyon (08-12)
- Cadillac: DTS (06-11)
- Buick: LaCrosse (06-09), Lucerne (06-11)
- Pontiac: G6 (06-10), Grand Prix (06-08)
- Saturn: Vue (07-10), Aura (07-09)
- Hummer: H3 (08-10)
Note: Always verify fitment using your vehicle’s year, make, and model, as installation locations and specific options can vary.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you a trip to the dealership and additional programming fees.
Is this part difficult to install myself?
Not at all. For a 2007-2009 Tahoe, the TCM is easily accessible next to the battery. The entire process typically takes less than 30 minutes with basic hand tools.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You can keep your old module, so there’s no hassle with return shipping or waiting for a core refund.
Will this fix my P0700 check engine light code?
In many cases, yes. A P0700 code is a general transmission fault code, often triggered by a failing TCM. Replacing the module is a very common and effective fix for this and related solenoid codes.
What if I install it and still have problems?
While this module fixes the most common transmission electronic issues, shifting problems can also stem from mechanical failures. If issues persist, it’s a good idea to have the transmission fluid level and condition checked, and to inspect the solenoids and wiring harness for damage.