Fix Your Suburban’s Shifting Problems for Good
If you’re dealing with a 2007 or 2008 Chevrolet Suburban 1500 that’s shifting erratically, banging into gear, or stuck in limp mode, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). The T42 module, specifically, is the electronic brain of your 4L60E or 4L65E transmission. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This isn’t just an inconvenience; it’s a critical component for your vehicle’s drivability and safety.
This replacement Transmission Control Module, part number 24235732, is the definitive solution. We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your vehicle’s specific VIN before it ships, ensuring it works perfectly right out of the box. This means no expensive trips to the dealer for programming—it’s a true plug-and-play fix for the home mechanic or professional shop.
From the Diagnostic Bay: The Misleading Solenoid Code
A customer brought in a 2008 Tahoe (which uses the same platform as your Suburban) with a P0752 code, indicating a stuck-on Shift Solenoid A. The previous shop had already replaced the solenoid inside the transmission pan—twice! The problem persisted. When I hooked up my scan tool, I could see the command to the solenoid was erratic. The issue wasn’t the solenoid itself, but the driver circuit inside the TCM that controls it. We installed a VIN-programmed 2007-2008 Suburban 1500 TCM, cleared the codes, and the truck shifted perfectly. This saved the customer from a costly and unnecessary transmission rebuild.
Is Your Suburban Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, a faulty module is the most likely culprit:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd), known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700 (Transmission Control System Malfunction) or various solenoid codes (P0750-P0770).
- ✔ A noticeable drop in fuel economy.
- ✔ The torque converter fails to lock up at highway speeds, causing high RPMs.
Your Straightforward 30-Minute Installation Guide
One of the best features of this part is its simple installation. For most GMT900 trucks and SUVs like your Suburban, the process is quick and requires only basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On your 2007-2008 Suburban 1500, the TCM is typically located in the engine bay, mounted next to the battery. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old module. 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.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for smooth shifting and ensure no warning lights are present. We recommend using a basic scan tool to clear any lingering codes from memory.
Verified Vehicle Compatibility List
This module is a direct replacement for part number 24235732 and is interchangeable with many other service numbers. While this page focuses on the 2007-2008 Suburban 1500 TCM, it also fits a wide range of GM vehicles. Please verify your specific model and part number for a guaranteed fit.
- Chevrolet Suburban 1500 (2007-2008) – Transmission; (next to battery)
- Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013)
- Chevrolet Tahoe & GMC Yukon / Yukon XL (2007-2009)
- Chevrolet Express & GMC Savana Vans (2006-2014)
- Cadillac DTS, Buick Lucerne, Chevrolet Impala, and many more.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module is delivered to you pre-programmed to your vehicle’s VIN. It is a plug-and-play installation, saving you hundreds in dealership fees and programming time.
What is a core charge?
There is no core charge for this part. You can keep your old, faulty module without needing to send it back, simplifying your repair process.
Will this fix a P0700 trouble code?
In many cases, yes. A P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the electrical fault, replacing it with this unit will resolve the code.
How difficult is the installation?
For a DIYer with basic tools, the installation is very straightforward and typically takes less than 30 minutes. The module is easily accessible in the engine bay on the Suburban.
What kind of warranty is included?
This part comes with a one-year warranty, giving you confidence and peace of mind in the quality and reliability of your repair.