Is Your Sierra 1500 Shifting Erratically or Stuck in Limp Mode?
There’s nothing more frustrating than a truck you can’t rely on. One minute your GMC Sierra is pulling strong, the next it’s slamming into gear, refusing to shift, or the check engine light glares at you from the dash. These aren’t just annoyances; they’re classic signs that the brain of your transmissionโthe Transmission Control Module (TCM)โis failing. In my 20+ years as a technician, I’ve seen how a bad TCM can sideline an otherwise perfectly good truck, leaving you guessing at every stoplight.
Expert Pro Tip: Check Before You Replace
Before you order, take a moment to inspect the main electrical connector on your old TCM. On these Sierra trucks, it’s located right next to the battery, exposed to the elements. I’ve seen dozens of cases where battery acid fumes or moisture have caused corrosion on the pins, leading to the exact same symptoms as a failed module. A quick clean with a contact cleaner and a small brush can sometimes solve the problem. If the pins are clean and tight but the problem persists, you’ve confidently isolated the failure to the TCM itself.
The Direct-Fit Solution for Your 2007-2013 Sierra 1500 TCM
This OEM-quality T42 Transmission Control Module is the definitive solution to restore your truck’s performance and reliability. It’s not just a replacement part; it’s a fully programmed, plug-and-play fix engineered to communicate flawlessly with your Sierra’s systems right out of the box. We handle the complex partโprogramming the module to your specific Vehicle Identification Number (VIN)โso you can handle the simple installation.
Common Symptoms of a Failing Sierra TCM:
- โ Harsh, delayed, or unpredictable gear shifts.
- โ Vehicle is stuck in a single gear (often 2nd or 3rd, known as “limp mode”).
- โ Check Engine Light and/or Transmission Warning Light are on.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0751, or other solenoid-related faults are present.
- โ A noticeable drop in fuel economy or a feeling of sluggish acceleration.
- โ Complete loss of communication with the transmission.
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest advantages of this module is that it arrives ready to install, saving you a trip to the dealership and hundreds in programming fees. The installation is straightforward for any DIYer with basic tools. For your 2007-2013 Sierra 1500 TCM, the module is conveniently located in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the TCM: Open the hood and find the TCM mounted right next to the battery on the driver’s side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. 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.
- Final Steps: Reconnect the negative battery terminal. While the module is pre-programmed, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the truck and enjoy smooth, correct shifting.
Guaranteed Compatibility & Quality
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is guaranteed to work and interchanges with part numbers including 24234503, 24252114, 24242391, and more. Built to strict OEM standards and backed by a one-year warranty, you can install it with complete confidence. Get your Sierra back to work and order yours today!