Restore Your Envoy’s Transmission Performance
Is your 2006 GMC Envoy XL suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for managing gear changes, fluid pressure, and torque converter operation. When it fails, it can lead to poor performance, decreased fuel economy, and potential damage to your transmission. This OEM-quality T42 TCM is the definitive solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We had a 2006 Envoy XL come into the shop last month with the customer complaining of harsh, unpredictable shifts and the vehicle being stuck in what felt like third gear (limp mode). The scanner pulled a P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. After checking the wiring harness and fluid, we identified the TCM as the culprit. Instead of a costly trip to the dealer for a new module and programming, we installed one of our VIN-programmed T42 units. The installation took less than 30 minutes. After clearing the codes, the test drive showed perfect, smooth shifts. The customer was back on the road the same day, having saved significant time and money.
Diagnosing Your 2006 Envoy XL TCM Failure
A faulty TCM can manifest in various ways, often mimicking other transmission problems. If you’re experiencing any of the symptoms below, it’s highly likely that your vehicle’s transmission computer is the source of the issue. Replacing the module is a direct and effective way to resolve these persistent electronic faults and restore the smooth, reliable operation you expect from your GM vehicle.
Symptoms of a Failing T42 TCM
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle stuck in limp mode (usually 2nd or 3rd gear).
- ✔ Illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Intermittent loss of communication with the module.
Key Features and Benefits
- ✔ VIN-Programmed for Your Vehicle: This module arrives ready for installation, pre-flashed with your Envoy XL’s specific VIN and the latest GM software updates. This eliminates the need for expensive dealership programming.
- ✔ Restores Original Performance: Engineered to OEM specifications, this module precisely controls transmission functions, ensuring smooth shifting and optimal powertrain performance.
- ✔ Direct-Fit Replacement: This part is a direct replacement for service number 24239224 and is interchangeable with numerous other GM part numbers, ensuring wide compatibility.
- ✔ No Core Charge: Keep your old part without any additional fees or the hassle of returning a core.
- ✔ One-Year Warranty: Drive with confidence knowing your purchase is protected by a comprehensive one-year warranty.
This T42 TCM is the ideal solution for a wide range of GM trucks and SUVs, including the Chevrolet Silverado, Tahoe, GMC Sierra, Yukon, and many more equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This module is sold as a VIN-programmed part. We flash it with your vehicle’s specific information before shipping, so it’s ready for plug-and-play installation right out of the box. No further programming is required.
Where is the TCM located on a 2006 GMC Envoy XL?
On the 2006 Envoy XL with the 8-cylinder engine, the Transmission Control Module is typically located in the engine compartment on the left-hand (driver’s) side.
Will this 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 of a P0700, it’s essential to diagnose any other codes that may be present. In many cases where the TCM itself has failed, replacing it will clear the P0700 and related codes.
Is installation difficult?
Installation is straightforward for someone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. The entire process usually takes under 30 minutes.
What transmissions is this T42 module compatible with?
This module is designed for vehicles equipped with popular GM 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E.