Restore Flawless Shifting to Your Suburban
Is your 2007-2008 Chevrolet Suburban 1500 suffering from erratic shifting, getting stuck in gear, or throwing transmission codes? You’re not alone. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can cause a host of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24240400, is the definitive solution to get your trusted SUV driving like new again. Forget expensive dealership visits and programming fees; this module arrives at your door pre-programmed to your vehicle’s specific VIN, making it a true plug-and-play fix.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Tahoe—same platform as your Suburban—with the check engine light on and the transmission stuck in 3rd gear (limp mode). They’d already spent money replacing a couple of shift solenoids based on a generic code, but the problem persisted. After a quick scan, I saw the classic P0700 code, which is just a general fault request from the TCM. Digging deeper, I found communication loss codes with the TCM itself. In my 20+ years, I’ve seen this exact scenario hundreds of times. The internal electronics of the original T42 module had failed. We installed one of our VIN-programmed modules, and in less than 30 minutes, the truck was shifting perfectly, and all codes were gone. It’s a common failure, but thankfully, it’s an easy fix with the right part.
Is Your Suburban Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, it presents as a series of electrical gremlins. If you’re experiencing any of the following, a faulty TCM is the likely culprit:
- ✔ Harsh, slamming, or delayed gear shifts.
- ✔ Vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration.
- ✔ A sudden drop in fuel economy.
- ✔ Intermittent loss of communication with the scan tool.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. You don’t need a professional lift or specialized programming equipment. For the 2007-2008 Suburban 1500, the process is quick and can be done with basic hand tools.
- 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: On your Suburban, the TCM is typically located in the engine compartment, right next to the battery. It’s a silver box with electrical connectors.
- Swap the Part: Carefully unplug the wiring harnesses from the old TCM. Then, unbolt it from its mounting bracket. Secure the new module in place and plug the connectors in firmly.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scanner, use it to clear any stored fault codes.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24240400 and is interchangeable with many other service numbers. While this page is focused on the 2007-2008 Suburban 1500 TCM, it also fits a wide range of other GM cars, trucks, and SUVs. Please verify your specific model in the list below.
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)
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
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)
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
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 more.
Frequently Asked Questions
Do I need to take this part to the dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is a plug-and-play solution that requires no additional programming or dealer intervention, saving you time and money.
Will this fix my transmission problems for good?
If your vehicle’s symptoms and diagnostic codes point to a faulty TCM, this part is the correct and permanent fix. It resolves the internal electronic failures common in the original T42 modules, restoring reliable transmission operation.
Where is the TCM located on my 2007 Suburban?
On the 2007-2008 Chevrolet Suburban 1500, the Transmission Control Module (TCM) is conveniently located in the engine bay, mounted right next to the battery.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it, making the process even simpler.
What if I have questions during installation?
We provide expert support. If you have any questions about your part or the installation process, our team of experienced technicians is here to help you get the job done right.