Restore Peak Performance to Your GM Vehicle’s Transmission
Is your 2006-2009 GMC Envoy, Chevrolet Trailblazer, or other GM vehicle suffering from erratic shifting, getting stuck in gear, or displaying transmission-related warning lights? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it fails, the driving experience can become unpredictable and frustrating. This genuine GM T42 Transmission Control Module, service part number 24243901, is the definitive solution, arriving expertly programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
From the Diagnostic Bay
We recently had a 2008 GMC Envoy come into the shop with the classic complaint: “It slams into gear and sometimes won’t shift past second.” The customer had already spent a small fortune replacing shift solenoids based on a generic code reading, with no improvement. After a quick scan, we saw the tell-tale communication error codes pointing directly at the TCM. Internal circuit failure in these T42 modules is common after years of heat cycles and vibration. We installed one of our VIN-programmed modules, cleared the codes, and the Envoy was shifting like it just rolled off the assembly line. The customer was thrilled to have a definitive fix without a costly trip to the dealership for programming.
Is Your Envoy Transmission Control Module Failing?
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, check for these common electronic symptoms:
- ✔ Harsh or Delayed Shifting: Experiencing abrupt, jerky gear changes or a noticeable lag when the transmission shifts.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Check Engine & Transmission Lights: The dashboard is illuminated with warnings, often accompanied by Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0755, or other solenoid-related faults.
- ✔ Inability to Shift: Complete failure to upshift or downshift, making the vehicle difficult or impossible to drive.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a sudden drop in miles per gallon.
- ✔ Intermittent Electrical Issues: Problems that come and go, often worsening as the vehicle warms up.
The Premier Solution: A VIN-Programmed Envoy Transmission Control Module
Don’t settle for a generic, unprogrammed module that requires expensive and time-consuming dealership intervention. Our T42 TCM is the smart, efficient choice for both professional technicians and DIY enthusiasts. We handle the complex programming for you. By providing your vehicle’s VIN during checkout, you receive a module loaded with the latest GM software specific to your Envoy’s configuration. This ensures all shift points, pressure controls, and electronic communications are perfectly calibrated right out of the box.
This module is a direct replacement for a wide range of original part numbers, including 24252114, 24234503, 24230461, and 24243901. It is engineered to meet or exceed original equipment standards for reliability and longevity, giving you peace of mind for years to come. Installation is straightforward for anyone with basic mechanical skills, typically located in the engine compartment for easy access.
Frequently Asked Questions
What does VIN programming mean for my Envoy?
VIN programming means we load the module with the specific software calibration file from GM that matches your vehicle’s unique Vehicle Identification Number. This ensures the TCM communicates perfectly with your engine computer and other modules, resulting in optimal shift patterns and performance without any additional setup.
Do I need to take my vehicle to a dealer after installation?
No. Because this module is pre-programmed to your VIN, you can skip the trip to the dealership. It is a true plug-and-play solution. Simply install the part, reconnect your battery, and clear any stored trouble codes with a standard scan tool.
Where is the TCM located on a 2006-2009 GMC Envoy?
On the 2006-2009 GMC Envoy, the Transmission Control Module is typically found in the engine compartment on the driver’s side (LH side), often near the firewall or strut tower.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the check engine light be turned on. While this module often resolves the root cause of a P0700, it’s essential to scan for other transmission-specific codes (like P07xx) to confirm the TCM is the faulty component.
Is there a core charge for this part?
No, there is no core charge required for this transmission control module. You can keep your old part, eliminating the hassle and expense of shipping a core back.