Is Your Envoy XL Shifting Erratically?
If you’re experiencing harsh shifts, delayed gear engagement, or your 2006 GMC Envoy XL 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 and ensuring smooth, efficient operation. When it fails, it can cause a cascade of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24230461, is the definitive solution to restore your vehicle’s transmission performance and get you back on the road with confidence.
From the Diagnostic Bay
We recently had a 2006 GMC Envoy XL come into the shop with the check engine light on and a complaint of it banging into gear. The owner was worried about a costly transmission rebuild. A quick scan pulled code P0700 (Transmission Control System Malfunction) and several solenoid-related codes. Instead of jumping to conclusions, we checked the TCM connections first. Finding no issues there, we knew the internal electronics of the module had failed—a common issue on these GM vehicles. We installed a VIN-programmed T42 TCM, cleared the codes, and the Envoy was shifting like new in under an hour. This simple replacement saved the customer thousands over a full transmission replacement.
Symptoms of a Failing 2006 Envoy XL TCM
- ✔️ Harsh, jerky, or unpredictable gear shifts.
- ✔️ The vehicle gets stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758 are present.
- ✔️ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔️ Poor acceleration and decreased fuel economy.
- ✔️ Complete loss of communication with the transmission module.
Plug-and-Play Solution: No Dealer Visit Required
The biggest hurdle when replacing modern electronic modules is the need for expensive dealership programming. We eliminate that step entirely. This module is pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it communicates perfectly with your Envoy XL’s other systems, like the Engine Control Module (ECM), right out of the box. Simply install the part, and you’re ready to go. It’s built to strict OEM standards for reliability and comes with a one-year warranty for your peace of mind.
Simple Installation
For the 2006 GMC Envoy XL, the TCM is conveniently located in the engine compartment on the left-hand (driver’s) side. The replacement process is straightforward for a DIY mechanic or any professional technician. Disconnect the negative battery terminal, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re done. We recommend using a basic scan tool to clear any stored DTCs after installation is complete. There is no core charge, so you don’t have to worry about the hassle and expense of sending your old part back.
Frequently Asked Questions
What does “VIN Programmed” mean for my Envoy XL?
It means we flash the module with the latest GM software specific to your vehicle’s VIN before we ship it. This makes the installation plug-and-play, ensuring it works correctly with your engine and other systems without requiring a trip to the dealership for expensive programming.
Will this TCM fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal solenoid circuit failures that trigger the P0700), you should always diagnose any other related codes. In many cases, replacing a faulty TCM will clear this and related codes.
Where is the TCM located on a 2006 GMC Envoy XL?
On the 2006 Envoy XL, the Transmission Control Module is typically found in the engine compartment on the driver’s side (LH side). Always confirm the location before beginning the replacement.
Is this compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. This includes models like the Chevrolet Silverado, Tahoe, Impala, GMC Sierra, and many more. Please verify the part number for your specific application.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time, cost, and hassle of a core return process.