Restore Flawless Shifting to Your Chevy Suburban
If your 2007-2008 Chevrolet Suburban 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’re not alone. After 20 years in the business, I’ve seen countless GM trucks and SUVs come into the shop with these exact issues. More often than not, the root cause isn’t a catastrophic transmission failure, but a faulty Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it fails, it can make your reliable family hauler feel unpredictable and unsafe. This replacement T42 TCM, part number 24256960, is the definitive solution to get your vehicle operating like new again.
Case Study: The ‘Bad Transmission’ That Wasn’t
A customer brought in their ’07 Suburban, frustrated after another shop quoted them over $3,000 for a transmission rebuild. The symptoms were classic: delayed engagement into drive, violent 1-2 shifts, and a persistent check engine light with code P0700 (Transmission Control System Malfunction). Instead of jumping to conclusions, we connected our high-level scanner and looked at the live data. The internal transmission components were fine, but the TCM was sending erratic signals to the solenoids. We installed one of our VIN-programmed modules, and in less than an hour of work, the Suburban was shifting perfectly. The customer saved thousands and avoided an unnecessary, major repair. This highlights why properly diagnosing the 2007-2008 Suburban 1500 TCM is the first, most crucial step.
Is Your Suburban Showing These Telltale TCM Failure Signs?
- ✔ Harsh, erratic, or delayed gear shifts that bang into place.
- ✔ Vehicle is stuck in “limp mode,” often only using 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ The transmission seems to slip out of gear or fails to upshift or downshift correctly.
The Advantage of a Pre-Programmed Solution
One of the biggest hurdles when replacing modern electronics is the need for expensive dealership programming. We eliminate that step entirely. By providing your vehicle’s VIN at checkout, we program this module with the latest GM software specific to your Suburban. This ensures it communicates perfectly with your engine computer (ECM) and other systems right out of the box. You get a reliable, plug-and-play fix without the added cost and hassle of a trip to the dealer. This is the ideal solution for both professional technicians aiming for efficiency and DIYers who want a straightforward, successful repair. A faulty 2007-2008 Suburban 1500 TCM can be a headache, but this part is the cure.
DIY Installation: Get Your Suburban Shifting Smoothly in Under an Hour
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- ✔ Locate the Module: On the 2007-2008 Suburban 1500, the TCM is typically located in the engine compartment, mounted next to the battery. It’s a silver box with large electrical connectors.
- ✔ Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that may need to be pressed or lifted. Once disconnected, unbolt the old module from its mounting bracket.
- ✔ Install the New TCM: Bolt the new, pre-programmed module into place. Securely reconnect the wiring harnesses, ensuring they click and lock into position.
- ✔ Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous failure. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Fitment For Your GM Truck or SUV
While this is the direct replacement for a 2007-2008 Suburban 1500 TCM, this versatile T42 module also fits a wide range of other General Motors vehicles. Please verify your model and any specific options below. This part is interchangeable with service numbers 24242391, 24234503, 24252114, 24256960, and others.
This part will fit these makes and models with these options:
- SUBURBAN 1500 07-08 Transmission; (next to battery)
- AVALANCHE 1500 07-08 Transmission; (next to battery)
- CADILLAC DTS 06-11 Transmission; (RH front engine compartment)
- CHEVROLET SILVERADO 1500 PICKUP 07-13 Transmission; (next to battery, check options)
- CHEVROLET TAHOE 07-09 Transmission; (next to battery, check options)
- GMC SIERRA 1500 PICKUP 07-13 Transmission; (next to battery, check options)
- GMC YUKON & YUKON XL 1500 07-08 Transmission; (next to battery)
- …and many more GM cars, trucks, and SUVs from 2006-2014. Please see the full fitment list for details.
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, with no extra programming required. This saves you time and money.
Where is the TCM located on my 2007 Suburban 1500?
On most 2007-2008 GMT900 platform trucks and SUVs like the Suburban, Tahoe, and Silverado, the TCM is located in the engine bay, mounted right next to the battery.
What tools are required for this job?
Installation is simple and typically only requires basic hand tools, such as a socket set (commonly 10mm) to unbolt the module and disconnect the battery. No specialized equipment is needed.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. While a failing TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you’re also experiencing shifting problems, replacing the TCM is the most likely fix.
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 returning it.