Are you battling frustrating transmission issues in your GMC Envoy or another GM vehicle? Symptoms like harsh, delayed shifting, a check engine light that won’t go away, or your vehicle being stuck in ‘limp mode’ are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, and when it malfunctions, it can disrupt your vehicle’s performance and reliability. This OEM-quality GM T42 Transmission Control Module, part number 24235732, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay
We recently had a 2008 Silverado 1500 towed in that was stuck in third gear. The owner was worried he was looking at a complete transmission rebuild. The check engine light was on, and our scan tool pulled a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of starting with a costly teardown, we checked the TCM first. After confirming the wiring harness was intact, we swapped in one of these VIN-programmed T42 modules. In under 30 minutes, we cleared the codes, took it for a test drive, and it was shifting perfectly through all gears. The customer saved thousands and was back on the road the same day. It’s a testament to how a targeted electronic component replacement can solve what seems like a catastrophic mechanical failure.
Common Symptoms of a Failing T42 TCM
- ✔ Unpredictable or jarring shifts between gears.
- ✔ The transmission hesitates to engage when shifting from Park to Drive or Reverse.
- ✔ Your vehicle is stuck in a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults are stored.
- ✔ A noticeable decrease in fuel economy due to inefficient gear changes.
- ✔ The torque converter fails to lock up at highway speeds, causing higher RPMs.
The Superior Solution: A Pre-Programmed Envoy Transmission Control Module
Replacing a modern electronic module can often be a two-step process: physical installation followed by a costly trip to the dealership for programming. Our process eliminates that second step entirely. We flash this Envoy Transmission Control Module with the latest GM software updates, tailored specifically to your vehicle’s VIN. This ensures that the module communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. This precise calibration restores factory shift points, torque converter strategy, and pressure controls for optimal performance and longevity. Don’t settle for a generic module that requires extra steps; get the correctly programmed part from the start.
This T42 TCM is built to meet and exceed original equipment standards, providing a reliable and durable repair for your vehicle. It is a direct-fit replacement for a wide array of GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Whether you’re fixing a daily driver like a Chevrolet Impala or a workhorse like a GMC Savana, this module is the right choice for restoring dependable operation.
Effortless Installation
Installation is straightforward for a DIY mechanic or professional technician. The module is typically located in the engine compartment, often on the LH or RH side, near the strut tower, battery, or under the air cleaner box, depending on your specific model. The entire process usually takes less than 30 minutes.
- Safety First: Always disconnect the vehicle’s battery before beginning work.
- Locate and Remove: Find the old TCM and carefully disconnect the electrical connectors and mounting hardware.
- Install New Module: Mount the new, pre-programmed module in the same location and securely re-attach the connectors.
- Final Steps: Reconnect the battery. While our programming handles the critical setup, it’s always good practice to use a scan tool to clear any old fault codes from the system’s memory.
Best of all, there is no core charge. You don’t have to worry about the hassle and expense of sending your old, faulty part back. This makes the repair process faster, simpler, and more affordable.
Frequently Asked Questions
Will this TCM fit my vehicle if it’s not a GMC Envoy?
Yes, absolutely. While this is a perfect fit for the 2006-2009 Envoy, the T42 TCM was used across a vast range of General Motors vehicles from 2006-2014, including the Chevrolet Silverado, Tahoe, Impala, GMC Sierra, Buick LaCrosse, and many more. Please check the detailed fitment list on this page to confirm compatibility with your specific model and year.
What does ‘VIN Programmed’ mean?
VIN programming means we load the module with the specific software and calibration files for your exact vehicle using your 17-digit Vehicle Identification Number (VIN). This ensures it works perfectly with your engine, transmission, and options, eliminating the need for a trip to the dealership for expensive programming.
Do I need to return my old TCM?
No, there is no core charge or requirement to return your old part. You can keep it, recycle it, or dispose of it at your convenience, making for a simpler and faster transaction.
Can I install this module myself?
Yes, this is a very DIY-friendly part. It’s a direct plug-and-play replacement. If you are comfortable working under the hood and have basic hand tools, you can typically complete the installation in under 30 minutes. Just remember to disconnect the battery first.
What if my part number is slightly different?
GM often uses multiple service numbers for the same part. This module, 24235732, is interchangeable with many other numbers like 24252114, 24234503, and 24242391. Our programming ensures it functions correctly as a replacement for any of the compatible part numbers listed.