Get Your Sierra Shifting Smoothly Again
If your 2007-2013 GMC Sierra 1500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re dealing with a faulty Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by this exact issue. The TCM is the brain of your automatic transmission, and when it fails, it can make your reliable workhorse feel unpredictable and unsafe. This T42 series TCM, part number 24235753, is the definitive, hassle-free solution to restore your truck’s performance and your peace of mind.
From the Diagnostic Bay: The Case of the Limp-Mode Sierra
A customer brought in his ’09 Sierra 1500, complaining it was stuck in what felt like third gear and the check engine light was on. He was worried about a complete transmission rebuild. I hooked up my scan tool and immediately saw the classic culprit: code P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. Instead of a costly internal repair, the issue was a failing TCM. We replaced it with one of these VIN-programmed units. The entire job took less than an hour, cleared all the codes, and the truck was shifting like it just rolled off the factory floor. He saved thousands and avoided unnecessary, invasive repairs.
Is Your Truck Showing These Telltale Signs?
A failing TCM doesn’t always mean total transmission failure. Often, it gives you warning signs. If you’re experiencing any of the following, it’s a strong indicator that your 2007-2013 Sierra 1500 TCM needs replacement:
- ✔ Unpredictable, harsh, or jerky gear changes.
- ✔ The transmission seems to slip or hesitate between gears.
- ✔ Your truck is stuck in “limp mode” (usually 2nd or 3rd gear) to protect the transmission.
- ✔ The check engine light or a transmission warning light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults are present.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete failure to shift up or down.
Your 30-Minute Path to a Smooth-Shifting Truck
One of the best features of this module is that it’s designed for a straightforward, direct-fit replacement. You don’t need a professional lift or specialized transmission tools. For most Sierra models, the process is simple:
- Safety First: Always disconnect the negative terminal on your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the TCM: On the 2007-2013 Sierra 1500, the TCM is typically located in the engine bay, right next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the wiring harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory. Start the truck and enjoy crisp, correct shifting!
Verified Compatibility for Your GM Vehicle
This T42 TCM is the correct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2007-2013 Sierra 1500 TCM, it also fits the following models. Please verify the location notes for your specific vehicle.
- GMC Sierra 1500/2500 Pickup (2007-2013): Located next to the battery.
- Chevrolet Silverado 1500/2500 Pickup (2007-2013): Located next to the battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Found next to the battery.
- Chevrolet Suburban / GMC Yukon XL 1500 (2007-2008): Found next to the battery.
- Chevrolet Express / GMC Savana Vans (2006-2014): Located in the RH engine compartment.
- Cadillac DTS (2006-2011): Located in the RH front engine compartment.
- Chevrolet Impala (2006-2011): Found under the lower air cleaner housing.
- Hummer H3 (2008-2010): Located in the RH rear engine compartment.
- And many more GM, Pontiac, Saturn, Buick, and Saab models. See full fitment list for details.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your truck’s engine computer and other systems right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Do I need to send my old TCM back? Is there a core charge?
No. There is absolutely no core charge for this part. You can keep your old module or dispose of it yourself, saving you the time and hassle of a return shipment.
Will this fix a P0700 code on my Sierra?
A P0700 is a generic code indicating a fault within the transmission control system. In many cases, a failing TCM is the root cause that triggers this code along with other, more specific codes. Replacing a faulty TCM with this unit is a very common and effective fix for a P0700 code.
Is this an OEM part? What kind of warranty does it have?
This is a high-quality replacement module built to meet or exceed original equipment manufacturer (OEM) standards for fit, form, and function. It comes with a one-year, hassle-free warranty for your protection.
Can I install this myself if I’m not a mechanic?
Absolutely. This is a great job for a DIY enthusiast. The installation is plug-and-play, requires only basic hand tools, and typically takes less than 30 minutes. The pre-programming saves you the most difficult step.