Is Your Sierra 1500 Shifting Erratically?
If you’re experiencing harsh shifts, 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 gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues, leaving your reliable truck feeling unpredictable and unsafe.
This genuine OEM-quality T42 Transmission Control Module, service part number 24235340, is the definitive solution to restore your truck’s performance. It arrives pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership visits for programming. This plug-and-play module ensures seamless communication between your engine and transmission, instantly correcting shifting problems and clearing persistent diagnostic trouble codes.
From the Diagnostic Bay
We had a 2008 Silverado (same platform as the Sierra) come into the shop stuck in third gear. The check engine light was on, and the owner was frustrated after being told he might need a new transmission. We scanned it and pulled a P0700 code along with several solenoid circuit faults. Instead of starting a costly internal repair, we checked the TCM first. After swapping in a VIN-programmed module like this one, we cleared the codes, and the truck shifted perfectly on the test drive. It was a 30-minute fix that saved the customer thousands.
The Ultimate Solution for Your 2007-2013 Sierra 1500 TCM
Don’t let a faulty module sideline your truck. This T42 TCM is engineered to meet and exceed original GM specifications, providing a reliable and lasting repair for your 4-speed automatic transmission (4L60E, 4L65E, 4L70E). By installing this pre-programmed unit, you are directly addressing the root cause of common transmission electronic failures, restoring the crisp, predictable shifting you expect from your GMC.
Symptoms of a Failing Transmission Control Module
- ✔ Harsh Shifting: Abrupt, jerky, or slamming gear changes during acceleration or deceleration.
- ✔ Limp Mode Activation: The vehicle gets stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light illuminates on your dashboard.
- ✔ Error Codes: Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related codes are stored.
- ✔ Delayed Engagement: A noticeable pause when shifting from Park into Drive or Reverse.
- ✔ Poor Fuel Economy: Inefficient shifting patterns lead to a sudden drop in miles per gallon.
- ✔ No Communication: A scan tool is unable to communicate with the transmission module, indicating a complete failure.
This module is a direct replacement for a wide range of GM vehicles from 2006-2014, including the Chevrolet Tahoe, Suburban, Express Van, GMC Yukon, and Savana. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24242391, and more, ensuring broad compatibility for your repair needs.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping it. This ensures the TCM is perfectly matched to your truck’s specific configuration (engine, axle ratio, tire size), making installation a simple plug-and-play process without needing a trip to the dealer.
Will this fix my truck being stuck in ‘limp mode’?
Yes, in most cases. Limp mode is a protective measure triggered by the vehicle’s computer when it detects a serious transmission fault. A failing TCM is one of the most common causes. Replacing the faulty module with this pre-programmed unit should restore normal shifting operation and resolve the issue.
Is this difficult to install myself?
For most DIY mechanics, this is a straightforward installation. On the 2007-2013 Sierra 1500, the TCM is typically located in the engine bay, often next to the battery or under the air cleaner box. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. The entire job can usually be completed in under 30 minutes with basic hand tools.
Do I need to return my old TCM? (Core Charge)
No, there is no core charge for this part. You can keep your old module or dispose of it as you see fit, simplifying the repair process for you.
How can I be sure the TCM is the problem and not the transmission itself?
While a professional diagnosis is always best, common indicators of a bad TCM include multiple transmission solenoid codes appearing at once, intermittent electrical issues, or a complete loss of communication with the module via a scan tool. If the transmission fluid is clean and at the correct level, and the problems are electronic in nature (erratic behavior, warning lights), the TCM is a very strong suspect.