Is Your GMC Envoy Shifting Erratically?
If your 2006, 2007, 2008, or 2009 GMC Envoy is giving you transmission headachesโlike slamming into gear, refusing to shift, or being stuck in limp modeโyou’re not alone. I’ve been a mechanic for over 20 years, and a faulty Transmission Control Module (TCM) is one of the most common issues I diagnose on these GM platforms. A customer’s ’07 Envoy came in last week with these exact symptoms: a P0700 code and it wouldn’t shift past 2nd gear. The problem wasn’t the transmission itself, but this small electronic brain that controls it.
This T42 Transmission Control Module, part number 24235732, is the direct, reliable solution. The best part? It arrives at your door pre-programmed to your vehicle’s specific VIN, eliminating the need for an expensive and time-consuming trip to the dealership. You can restore your vehicle’s performance right in your own driveway.
Diagnosing a Failed 2006-2009 Envoy Transmission Module
A failing TCM can mimic a serious internal transmission problem, but it’s often a much simpler fix. Look out for these common warning signs:
- โ Harsh, delayed, or erratic gear shifts that feel like the transmission is slipping or banging.
- โ The vehicle is stuck in a single gear (often called “limp mode”) to protect the transmission.
- โ Check Engine Light or other transmission warning lights are illuminated on the dash.
- โ Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758) are present.
- โ A noticeable decrease in fuel economy due to inefficient shifting.
- โ Complete loss of communication with the transmission, leading to a no-shift condition.
Expert Pro Tip: Before plugging in your new TCM, take a moment to inspect the harness connectors for any signs of green or white corrosion. I’ve seen perfectly good replacement modules fail to communicate simply because of dirty pins. A quick spray with electronics cleaner and a gentle scrub with a small brush can save you a major diagnostic headache.
Plug-and-Play Installation: Get Back on the Road in Under 30 Minutes
Replacing the TCM on your Envoy is a straightforward job that most DIYers can handle with basic tools. Our VIN programming makes it a true plug-and-play repair.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic repair.
- Locate the Module: On the 2006-2009 GMC Envoy, the TCM is typically found in the engine compartment on the left-hand (driver’s) side.
- Swap the Part: Carefully unplug the electrical connectors from the old module. Unbolt it from its mounting location, install the new module, and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Guaranteed Compatibility and Reliability
This module is built to meet or exceed OEM specifications for a dependable, long-lasting repair. It is a direct replacement for multiple part numbers, ensuring a perfect fit for your vehicle. We stand behind our quality with a one-year warranty, giving you peace of mind.
- โ Part Number: 24235732
- โ Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235753, 24240449, YNXS
- โ No Core Charge: Keep your old part. No need to worry about returns or extra fees.