Is Your 2006 Envoy XL Shifting Erratically?
If you’re dealing with harsh gear changes, a check engine light that won’t go away, or your 2006 GMC Envoy XL is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely cause. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift, managing fluid pressure, and ensuring smooth, efficient operation. When it fails, it can cause a wide range of frustrating and potentially damaging issues, leaving your reliable SUV feeling unpredictable and unsafe.
From the Diagnostic Bay
We had a customer with a 2007 Silverado who was at his wit’s end. He had already spent hundreds replacing shift solenoids and the transmission fluid, but the truck still shifted hard from first to second and occasionally threw a P0700 code. He was convinced his transmission was shot. After plugging in our scanner, we saw communication errors with the TCM. We installed one of our VIN-programmed T42 modules, and within a 30-minute test drive, the truck was shifting like it just rolled off the factory floor. It’s a classic case where the problem isn’t mechanical, but the electronic controller itself.
Symptoms of a Failing GM T42 TCM
- ✔ Harsh or Delayed Shifting: Experiencing jarring gear changes, hesitations, or a noticeable lag when the transmission shifts.
- ✔ Stuck in Gear / Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- ✔ Check Engine & Transmission Warning Lights: The dashboard lights up with warnings, often accompanied by Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related codes.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up issues can lead to a significant drop in your vehicle’s MPG.
- ✔ No Communication with Scan Tool: In severe cases, the TCM may fail completely, making it impossible for a diagnostic scanner to communicate with the transmission.
- ✔ Erratic Upshifting or Downshifting: The transmission may shift at the wrong times, causing the engine to rev too high or bog down.
The Plug-and-Play Solution: A Programmed 2006 Envoy XL TCM
This genuine OEM-quality T42 Transmission Control Module is the definitive solution to your transmission woes. What sets our modules apart is our expert VIN programming service. Before we ship your part, we flash it with the latest GM software specific to your 2006 Envoy XL’s exact Vehicle Identification Number. This critical step ensures the module communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming—this part is truly plug-and-play.
Installation is straightforward for a DIY mechanic. On the 2006 Envoy XL, the TCM is typically located in the left-hand (driver’s side) engine compartment. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. By replacing your faulty 2006 Envoy XL TCM, you restore the precise, smooth performance your vehicle was designed to deliver.
Part Interchangeability
This module is a direct replacement for a wide range of GM part numbers, ensuring broad compatibility. It interchanges with the following service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, and YNXS.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for a plug-and-play installation, with no additional programming required.
Where is the TCM located on my 2006 GMC Envoy XL?
On the 2006 Envoy XL with the 8-cylinder engine, the Transmission Control Module is located in the engine compartment on the left-hand (driver’s) side.
What is the warranty on this part?
This part is backed by our standard one-year warranty, covering any defects in the module for your peace of mind.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, you should always diagnose the specific codes stored within the TCM itself for a complete picture.
Is there a core charge for my old part?
No, we do not require you to send back your old module. There is no core charge associated with this purchase, making the process simple and hassle-free.