Get Your Suburban Shifting Smoothly Again
Is your 2007 or 2008 Chevrolet Suburban 1500 suffering from harsh, erratic shifting, or getting stuck in gear? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and potentially dangerous issues. As the electronic brain of your automatic transmission, the TCM dictates every gear change. When it falters, drivability suffers. This OEM-quality T42 TCM, part number 24243921, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play fix.
From the Diagnostic Bay: A Common Suburban Story
I recently had a 2008 Suburban 1500 come into my shop. The owner was concerned about a sudden, violent bang when shifting from 1st to 2nd gear, especially under light acceleration. The check engine light was on, and a quick scan revealed a P0750-series code for a shift solenoid circuit fault. After verifying the wiring and solenoid resistance were within spec, experience pointed directly to the TCM. These T42 modules are notorious for internal circuit failures that create these exact symptoms. We installed one of our VIN-programmed modules, and in less than an hour, the Suburban was shifting as smoothly as it did the day it left the factory. This part prevents you from chasing phantom electrical issues and gets the job done right the first time.
Is Your Suburban Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these symptoms can lead to more significant transmission damage down the road.
- ✔ Harsh, slamming, or delayed gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually only 2nd or 3rd gear is available).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0751, P0756, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
A Straightforward Guide to Installation
One of the best features of this part is its simple installation, which a confident DIYer can complete in under 30 minutes. For your 2007-2008 Suburban 1500 TCM, the module is typically located in the engine bay, next to the battery. Follow these steps for a successful replacement:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Old TCM: Find the module mounted next to the battery. It will have several large electrical connectors attached to it.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24243921 and other interchangeable numbers like 24252114, 24234503, and 24243901. While this page focuses on the 2007-2008 Suburban 1500 TCM, it is also compatible with a wide range of GM vehicles. Please verify your specific model in the list below:
- Chevrolet: Suburban 1500 (07-08), Avalanche 1500 (07-08), Tahoe (07-09), Silverado (07-13), Express Van (06-14), Cobalt (06-10), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Colorado (08-12), Malibu (06-10)
- GMC: Yukon / Yukon XL 1500 (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), Rainier (06-07)
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means this module is ready to install right out of the box. We load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your engine and transmission, eliminating the need for an expensive programming session at a dealership.
Do I need any special tools for this installation?
No special tools are required. Basic hand tools, such as a socket set to unbolt the module and disconnect the battery, are all you need. A simple OBD2 scanner is recommended to clear old codes, but is not strictly necessary for the part to function.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request, meaning the TCM has detected a problem and asked the main computer to turn on the check engine light. This module often resolves the underlying issue (like a solenoid circuit fault) that causes the P0700 code to appear. After installation, clearing the codes should resolve the P0700 as well.
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 at your convenience without the hassle of shipping it back to us.
How do I know this is the right part for my Suburban?
This part is guaranteed to fit 2007-2008 Chevrolet Suburban 1500 models. You can also match the part number 24243921 (or any of the interchangeable numbers listed) from your original module to confirm a perfect match.