Is Your Sierra 1500 Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your 2007-2013 GMC Sierra 1500 is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift, managing torque converter lockup, and monitoring transmission health. When it fails, it can cause a cascade of frustrating and potentially damaging issues, from poor fuel economy to a complete loss of drivability.
From the Diagnostic Bay
We recently had a 2008 Sierra 1500 come into the shop with classic symptoms of a failing transmission—slipping between gears and a P0752 (Shift Solenoid ‘A’ Stuck On) code. The owner had already spent a fair amount of money replacing the solenoid pack inside the transmission pan, but the problem persisted. After a quick diagnostic check, we confirmed the solenoids were receiving incorrect voltage signals. The root cause wasn’t mechanical; it was the electronic TCM failing. We installed a VIN-programmed T42 module, cleared the codes, and the truck was shifting perfectly within 30 minutes. This is a common scenario where diagnosing the electronics first saves time, money, and unnecessary mechanical work.
The Direct Solution: A VIN-Programmed T42 TCM
Don’t let a faulty module keep your truck off the road. This OEM-quality T42 Transmission Control Module, part number 24235753, is the definitive solution for restoring your vehicle’s transmission performance. What sets our modules apart is the crucial VIN programming service we perform before shipping. We load your truck’s specific Vehicle Identification Number and the latest GM software onto the module. This ensures it communicates flawlessly with your vehicle’s powertrain control module (PCM) and other systems right out of the box. You get a true plug-and-play installation without the need for an expensive trip to the dealership for programming.
Symptoms of a Failing Sierra 1500 Transmission Module
- ✔ Erratic and Harsh Shifting: Your truck may bang into gear, hesitate, or shift at the wrong times.
- ✔ Stuck in Gear / Limp Mode: The transmission may refuse to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You’ll find codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750-P0774).
- ✔ Poor Fuel Economy: Inefficient shifting and failure to engage torque converter lockup can cause a noticeable drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM at all.
This module is a direct replacement for a wide range of original equipment part numbers, including 24252114, 24234503, 24230461, 24234274, 24235754, and many others, ensuring broad compatibility across the GM family of trucks, vans, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Installation and Getting Back on the Road
Installation is straightforward for a DIY mechanic or any professional technician. On the 2007-2013 Sierra 1500, the TCM is typically located in the engine bay, next to the battery. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it from its bracket, and install the new one in its place. Reconnect everything, and you’re ready to go. While the module is pre-programmed, it’s always a good practice to use a scan tool to clear any old fault codes stored in other vehicle systems after installation.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program this module with your vehicle’s specific VIN before it ships. This makes it a plug-and-play part, saving you the time and expense of a dealership visit for programming.
Where is the TCM located on my GMC Sierra?
On most 2007-2013 GMC Sierra and Chevrolet Silverado models, the T42 TCM is found in the engine compartment, mounted on a bracket right next to the battery.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While replacing a faulty TCM will often resolve the issue, it’s important to have the vehicle scanned for other transmission-specific codes that the P0700 is pointing to. This module is designed to resolve internal electronic failures that cause these codes.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a vast range of 2006-2014 GM vehicles, including the Chevrolet Tahoe, Suburban, Silverado, Express, GMC Yukon, Savana, Cadillac DTS, and many more that use a 4-speed automatic transmission. Please verify fitment using your vehicle’s information or the part number.
Do you require my old part back?
No, there is no core charge for this part. You can keep your old module without any hassle or additional fees.