Restore Smooth, Reliable Shifting to Your Chevy Suburban
Is your 2007-2008 Chevrolet Suburban 1500 suffering from harsh shifting, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline an otherwise dependable family vehicle. The TCM is the brain of your automatic transmission, and when it falters, it can cause a host of frustrating and potentially unsafe driving conditions. This OEM-quality T42 TCM, part number 24235340, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook: The Intermittent Limp Mode Case
I remember a 2008 Suburban that came into the shop with a complaint that stumped two other mechanics. The owner said it would randomly drop into ‘limp mode’ (stuck in 3rd gear) but only on hot days after a long drive. There were no hard codes stored, just a generic P0700 (Transmission Control System Malfunction) that would appear and disappear. We checked the fluid, wiring, and solenoids—all fine. The issue was heat-soak affecting the original TCM’s internal processor. After installing a VIN-programmed module like this one, the problem was solved permanently. It’s a classic failure mode for these units, and this replacement is the reliable fix.
Is Your Suburban Exhibiting These Transmission Issues?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need. In my bay, these are the tell-tale signs I look for when diagnosing a bad 2007-2008 Suburban 1500 TCM.
- ✔ Harsh, banging shifts or erratic gear changes.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid circuit faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Complete loss of communication with the transmission module (no gear indicator display).
- ✔ Poor fuel economy and a feeling of sluggish performance.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. You don’t need specialized dealer tools, just basic hand tools and about 30 minutes. For your Suburban, the process is very accessible for a DIYer or a professional technician.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the TCM: On the 2007-2008 Suburban 1500, the TCM is conveniently located in the engine compartment, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors 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 connectors. You’ll hear a click as they lock in.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and check that the transmission shifts smoothly and all warning lights are off. A quick drive will confirm the repair.
Verified Vehicle Compatibility
While this part is a direct-fit solution for the 2007-2008 Suburban 1500 TCM, it is also compatible with a wide range of other GM vehicles that use the T42 module. This part is interchangeable with service numbers including 24242391, 24234503, 24252114, and many more. Please verify your vehicle in the list below.
- ✔ Chevrolet Suburban 1500 (2007-2008) – Transmission; (next to battery)
- ✔ Chevrolet Avalanche 1500 (2007-2008)
- ✔ Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013, check options)
- ✔ Chevrolet Tahoe & GMC Yukon / Yukon XL 1500 (2007-2009)
- ✔ Cadillac DTS (2006-2011)
- ✔ Buick LaCrosse / Lucerne (2006-2011)
- ✔ Hummer H3 (2008-2010)
- ✔ And many more GM models from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we program the module with your vehicle’s unique Vehicle Identification Number (VIN) before shipping. This ensures it communicates perfectly with your engine computer and other systems right out of the box, with no expensive trip to the dealership required for programming.
Is this a new or used part?
This is a high-quality, inspected, and tested OEM-standard part, guaranteed to meet or exceed original factory performance. It is backed by our one-year warranty for your peace of mind.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
Will this fix a P0700 code?
A P0700 is a general code indicating the TCM has detected a fault. While a failing TCM is a very common cause, you should also check for other specific codes (like solenoid or sensor codes) to confirm the diagnosis. In many cases, replacing the TCM will resolve the P0700 and the underlying issue.
How do I provide my VIN?
You can enter your vehicle’s 17-digit VIN during the checkout process. This is a critical step to ensure we can program the module correctly for your specific Suburban.