Stop Frustrating Transmission Problems in Your GM Vehicle
If you’re dealing with a GMC Envoy that’s shifting erratically, getting stuck in gear, or throwing transmission codes, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs come into the bay with these exact issues. The culprit is almost always a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, and when it malfunctions, it can make your vehicle unreliable and unsafe to drive. This T42 TCM, part number 24240449, is the definitive, hassle-free solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay: The Case of the Erratic Envoy
A customer brought in his 2007 GMC Envoy, complaining of harsh 1-2 shifts and occasionally getting stuck in what he called “limp mode.” His check engine light was on, and a quick scan revealed a P0700 (Transmission Control System Malfunction) and a P0753 (Shift Solenoid ‘A’ Electrical). While the solenoid code might point to the solenoid itself, my experience with these T42 systems immediately made me suspect the module. These TCMs are known for internal circuit failures that create false solenoid codes. Instead of a costly internal transmission repair, we started with the brain. After installing this VIN-programmed module, all codes cleared, and the Envoy shifted as smoothly as it did the day it left the factory. This part saved the customer hundreds in unnecessary diagnostic time and repairs.
The Power of Pre-Programmed Performance
The single biggest headache with replacing electronic modules is the required trip to the dealership for programming. We eliminate that step completely. We pre-program this 2006-2009 Envoy TCM to your vehicle’s specific VIN before it ships. This means it arrives ready for a true plug-and-play installation, loaded with the latest GM software updates for optimal shift patterns, torque converter lockup, and fuel efficiency. You get a reliable repair without the added time and expense of a dealer visit.
Is Your Envoy Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Catching the symptoms early can prevent further damage. Look out for these common indicators:
- âś” Harsh, jerky, or delayed gear shifts.
- âś” Vehicle is stuck in one gear (often 2nd or 3rd) and won’t shift up or down.
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- âś” A sudden drop in fuel economy or a transmission overheating warning.
- âś” Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. For most compatible vehicles, including the 2006-2009 Envoy, the process is simple and can be done in your driveway in under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the GMC Envoy and similar models, the TCM is typically found in the engine compartment on the driver’s side (LH). Check near the strut tower or under the air cleaner box.
- Swap the Part: Carefully disconnect the electrical connectors and unbolt the old module. Secure the new module in its place and reconnect the wiring harnesses. Ensure they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored DTCs.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24234274, 24240449, and more. Please verify your vehicle’s fitment below:
TRAILBLAZER 06-09
RAINIER 06-07
SAAB 9-7X 06-09
SILVERADO 1500 07-13
SIERRA 1500 07-13
TAHOE 07-09
YUKON 07-09
SUBURBAN 1500 07-08
YUKON XL 1500 07-08
AVALANCHE 1500 07-08
SAVANA & EXPRESS VANS (1500/2500/3500) 06-14
COLORADO 08-12
CANYON 08-12
HUMMER H3 08-10
IMPALA 06-11
MONTE CARLO 06-07
GRAND PRIX 06-08
LACROSSE / ALLURE 06-09
LUCERNE 06-11
CADILLAC DTS 06-11
COBALT 06-10
G5 / PURSUIT 06-10
HHR 06-11
ION 06-07
G6 06-10
MALIBU 06-10
AURA 07-09
SATURN VUE 07-10
UPLANDER / MONTANA / TERRAZA / RENDEZVOUS 06-09
SSR 05-06
Do I need to take this part to a dealer for programming?
Do I need to take this part to a dealer for programming?
No. We handle all the programming for you. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the correct software. It will be ready to install right out of the box.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part that has been expertly tested and programmed. It is backed by our one-year warranty for your protection.
What tools do I need for the installation?
For most applications, you will only need basic hand tools, such as a socket set and a wrench to disconnect the battery. No specialized equipment is required.
Is there a core charge for my old TCM?
No, there is absolutely no core charge. You can keep your old part or dispose of it without the hassle of returning it to us.
Will this 2006-2009 Envoy TCM fix a P0700 code?
Yes, a P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, replacing a faulty TCM will resolve the P0700 code and any related specific transmission codes.