Restore Your Ride’s Performance and End Transmission Headaches
If your 2006-2009 GMC Envoy is suffering from erratic shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise reliable vehicle. This isn’t just an inconvenience; it’s a critical failure that compromises safety and drivability. This T42 Envoy Transmission Control Module, part number 24240449, is the definitive, no-hassle solution to get you back on the road with confidence.
A Technician’s Notebook: The T42’s Common Failure Point
I remember a 2008 Chevy Trailblazer (which shares the same platform as the Envoy) that came into my bay stuck in third gear—classic limp mode. The customer had already replaced two shift solenoids trying to chase down a P0753 code, with no luck. After a quick check of the wiring harness, I honed in on the TCM. These T42 modules, especially when mounted in the hot engine bay, are prone to internal circuit board failures from years of heat cycles. A new, properly programmed module fixed the issue instantly. This isn’t just about replacing a part; it’s about applying a reliable fix that addresses the root cause.
Is Your GMC Envoy Showing These Red Flags?
- âś” Harsh, jerky, or delayed gear shifts that make driving uncomfortable.
- âś” The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- âś” Check Engine Light or Transmission Warning Light is illuminated with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- âś” A sudden, noticeable drop in fuel economy as the transmission operates inefficiently.
- âś” Complete loss of communication with the module, leading to a no-start or no-shift condition.
Ignoring these symptoms can lead to more severe and costly damage to your transmission’s internal components. Replacing your faulty Envoy Transmission Control Module is a critical step in preserving the life of your vehicle’s drivetrain.
DIY Installation: Get Your Envoy Shifting Smoothly in Under 30 Minutes
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- âś” Locate the Module: On the GMC Envoy, the TCM is typically found in the engine compartment on the driver’s side (LH). Refer to your vehicle’s service manual for the exact location.
- âś” Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Then, unbolt the module from its mounting bracket.
- âś” Install the New Module: Mount the new TCM, securely reconnect the electrical harnesses, and re-attach the battery terminal.
- âś” Final Steps: Start the vehicle. While our VIN programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous module’s failure.
Verified Fitment For These GM Vehicles
This module is a direct-fit replacement for a wide range of GM trucks, SUVs, and cars equipped with the T42 TCM and 4-speed automatic transmissions (4L60E, 4L65E, 4L70E). It is interchangeable with part numbers 24252114, 24234503, 24240449, and more. While this is the correct Envoy Transmission Control Module for 2006-2009 models, it also fits:
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche, Express, Colorado, Impala, Cobalt, HHR
- GMC: Sierra, Yukon, Savana, Canyon
- Buick: Rainier, LaCrosse, Lucerne
- Pontiac: G6, Grand Prix
- Cadillac: DTS
- Hummer: H3
- Saab: 9-7X
- …and many other models. Please verify the part number or use our vehicle selector to confirm compatibility.
Frequently Asked Questions
Do I need to take this module to a dealer for programming?
No. This module comes pre-programmed to your vehicle’s specific VIN. It’s a true plug-and-play solution that saves you the time, cost, and hassle of a dealership visit.
Will this fix my P0700 transmission code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. In most cases where the TCM itself has failed, replacing it with this programmed unit will resolve the P0700 and any other related transmission codes.
Is there a core charge?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
Where is the TCM located on a 2007 GMC Envoy?
On the 2006-2009 GMC Envoy and its sibling, the Trailblazer, the Transmission Control Module is typically located in the engine bay on the driver’s side, near the firewall or inner fender.
What kind of warranty is included?
This part is backed by our one-year warranty, giving you peace of mind and assurance in the quality and reliability of your repair.