Restore Smooth, Reliable Shifting to Your GMC Truck
If your 2007-2013 GMC Sierra 1500 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. After 20 years in the shop, I’ve seen countless GM trucks exhibit these exact issues, often leading owners to fear a costly transmission rebuild. In most cases, the fix is much simpler: a reliable, correctly programmed TCM. This T42 Transmission Control Module, part number 24243901, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
This isn’t just a replacement part; it’s a restoration of your vehicle’s drivability. The TCM is the brain of your automatic transmission, controlling everything from shift points and line pressure to torque converter lockup. When it fails, communication breaks down, resulting in the erratic behavior you’re experiencing. Our module, loaded with the latest GM software for your VIN, re-establishes that critical communication, eliminating guesswork and the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
A customer brought in his ’09 Sierra 1500 with a complaint that was driving him crazy: intermittent, bone-jarring shifts from 1st to 2nd, but only after the truck was fully warmed up. He’d already replaced a shift solenoid with no change. The scan tool showed a generic P0700 (Transmission Control System Malfunction) code. Instead of tearing into the transmission, we checked the TCM. Heat soak was causing an internal fault in the module. We installed one of our VIN-programmed T42 modules, and in less than 30 minutes, the truck was shifting like it just rolled off the factory floor. It’s a common story and a fix that saves thousands.
Is Your Sierra Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- âś” Hard, delayed, or erratic gear shifts that disrupt your drive.
- âś” The truck feels stuck in one gear (often called “limp mode”), typically 2nd or 3rd.
- âś” Check Engine Light or Transmission Warning Light is illuminated with codes like P0700, P0750, or other solenoid-related faults.
- âś” Inability to upshift or downshift properly, leading to poor acceleration and performance.
- âś” A noticeable drop in fuel economy or signs of the transmission running hotter than usual.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. For most 2007-2013 Sierra 1500 TCM replacements, the module is located right next to the battery in the engine bay. You can have your truck back on the road in under 30 minutes.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the system.
- Locate the Old TCM: On your Sierra, it’s typically mounted on a bracket right next to the battery. It’s a silver box with a few large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, VIN-programmed TCM into place. Securely plug in the wiring harnesses until they click, ensuring a solid connection.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored diagnostic trouble codes (DTCs) from the vehicle’s memory. Start the truck and enjoy smooth shifting!
Verified Vehicle Compatibility List
While this is the correct 2007-2013 Sierra 1500 TCM, it also serves as a direct replacement for a wide range of GM vehicles using the 4L60E, 4L65E, and 4L70E transmissions. This module is interchangeable with part numbers 24252114, 24234503, 24243901, and others. Please verify your specific model below:
- GMC Sierra 1500 Pickup (2007-2013) – Located next to battery
- Chevrolet Silverado 1500 Pickup (2007-2013) – Located next to battery
- Chevrolet Tahoe / GMC Yukon (2007-2009) – Located next to battery
- Chevrolet Suburban / GMC Yukon XL 1500 (2007-2008) – Located next to battery
- GMC Savana / Chevrolet Express Vans (2006-2014) – RH engine compartment
- Cadillac DTS (2006-2011) – RH front engine compartment
- Hummer H3 (2008-2010) – RH rear engine compartment
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Do I need to take my truck to the dealer for programming?
Do I need to take my truck to the dealer for programming?
No. This is the biggest benefit. We program the module to your vehicle’s VIN before shipping it. It arrives ready for installation, saving you hundreds in dealership programming fees and hassle.
Is this a difficult part to install myself?
Not at all. For the GMC Sierra, it’s one of the easier electronic modules to replace. It’s located right next to the battery and requires only basic hand tools. Most DIYers can complete the job in under 30 minutes.
What is a core charge? Do I need to send my old part back?
There is absolutely no core charge on this part. You can keep your old module or dispose of it yourself, making the process faster and more convenient for you.
Will this fix a P0700 check engine light code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. If the underlying issue is the TCM itself, replacing it will resolve the code. However, P0700 can also be triggered by other transmission issues, so proper diagnosis is always recommended.
What transmissions is this T42 module compatible with?
This TCM is designed for a wide range of popular 4-speed GM automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E. It’s a versatile solution for many GM trucks, vans, and SUVs from the mid-2000s to early-2010s.