Restore Smooth, Reliable Shifting to Your 2006 GMC Envoy XL
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams into gear, or has left you stranded in limp mode, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can mimic a major mechanical failure. This VIN-programmed T42 TCM, part number 24243901, is the definitive solution for your 2006 Envoy XL TCM issues, restoring the crisp, predictable performance your vehicle had when it was new.
The TCM is the brain of your automatic transmission, responsible for processing data from vehicle sensors to command precise gear changes and torque converter operation. When it fails, communication breaks down, leading to the erratic behavior you’re likely experiencing. Instead of a costly and uncertain trip to the dealership, this module arrives pre-loaded with your vehicle’s specific VIN and the latest GM software, making it a true plug-and-play fix for DIYers and professional shops alike.
Case Study: The Intermittent Limp Mode Nightmare
A customer brought in their 2006 Envoy with a complaint that stumped two other shops. The truck would randomly go into limp mode (stuck in 3rd gear) but would reset and drive fine after sitting overnight. Scans showed intermittent solenoid circuit codes, but the solenoids themselves tested fine. After checking the wiring harness for the third time, I focused on the TCM. On these GM platforms, I’ve seen heat and vibration cause microscopic cracks in the TCM’s circuit board, leading to these exact ‘ghost’ problems. We swapped in a VIN-programmed module, and the problem was solved instantly. The customer saved hundreds, possibly thousands, by avoiding an unnecessary transmission rebuild.
Is Your Envoy XL Showing These Telltale Signs?
A failing TCM often presents a clear set of symptoms. If you’re noticing any of the following, this module is your likely solution:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in one gear (often 2nd or 3rd) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, P0753, or other solenoid-related DTCs.
- ✔ Sudden loss of power and poor acceleration.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete failure to engage any gear (no forward or reverse).
A Straightforward Guide to Installation
You don’t need to be a master mechanic to replace this part. The process is simple and can typically be completed in under 30 minutes in your own driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On your 2006 Envoy XL, the TCM is typically found in the engine compartment on the left-hand (driver’s) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to idle for a moment. Use a basic OBD2 scanner to clear any stored fault codes and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24243901 and interchanges with numerous other GM service numbers. It is guaranteed to fit the following vehicles:
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 06-09 Transmission; (LH engine compartment)
TRAILBLAZER 06-09 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
RAINIER 06-07 Transmission
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SILVERADO & SIERRA 1500/2500 07-13 Transmission; (next to battery)
TAHOE & YUKON 07-09 Transmission; (next to battery)
SUBURBAN & YUKON XL 1500 07-08 Transmission; (next to battery)
AVALANCHE 1500 07-08 Transmission; (next to battery)
SAVANA & EXPRESS VANS 1500/2500/3500 06-14 Transmission; (RH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
COLORADO & CANYON 08-12 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
LACROSSE & ALLURE 06-09 Transmission; (lower air cleaner housing)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
LUCERNE 06-11 Transmission; (LH engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
COBALT & G5 & PURSUIT 06-10 Transmission; (LH strut tower)
HHR 06-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
G6 06-10 Transmission; (LH strut tower)
AURA 07-09 Transmission; (LH frame rail front)
ION 06-07 Transmission; (behind LH strut tower)
VUE 07-10 Transmission; (engine compartment)
SSR 05-06 Transmission; (front LH frame)
UPLANDER / MONTANA / TERRAZA / RENDEZVOUS 06-09 Transmission
Note: This is not an exhaustive list. Please verify your part number.
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. This module comes fully pre-programmed to your vehicle’s VIN before shipping. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
What is a ‘core charge’? Do I need to send my old part back?
There is absolutely no core charge for this part. You can keep your old module or dispose of it without any extra fees or hassle.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (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 (like solenoid or sensor codes) to confirm the TCM is the root cause.
Is this an OEM part? What is the warranty?
This is a high-quality replacement part built to meet or exceed OEM specifications for performance and reliability. It comes with a comprehensive one-year warranty for your peace of mind.