End Your Pontiac G6’s Shifting Nightmares
If your 2006-2010 Pontiac G6 is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the transmission’s brain, a faulty TCM can make your daily drive unpredictable and frustrating. This T42 TCM, part number 24240400, is the definitive, hassle-free solution. We pre-program it to your car’s specific VIN, so it arrives ready for a true plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The G6 Stuck in Third
A customer brought in a 2008 Pontiac G6 that wouldn’t shift past third gear—a classic limp mode scenario. The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a few solenoid circuit codes. After verifying the wiring and solenoids were good, all signs pointed to the TCM. In my 20+ years, I’ve seen hundreds of these T42 module failures caused by internal circuit board issues. Instead of a costly diagnostic rabbit hole, we installed one of our VIN-programmed modules. In under 30 minutes, the car was shifting smoothly through all gears, the codes were gone, and the customer was back on the road without the dealership’s high labor costs. This is the most direct and reliable fix for these common symptoms.
Is Your Pontiac G6 Showing These Telltale Signs?
A failing TCM doesn’t just get worse; it can lead to more significant transmission damage if ignored. If you’re experiencing any of the following, it’s time for a replacement:
- ✔ Abrupt, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other transmission-related solenoid codes are present.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission seems to slip out of gear unexpectedly.
DIY-Friendly Installation Guide for Your G6
You don’t need to be a professional mechanic to install this part. For the 2006-2010 G6 Transmission Module, the process is straightforward and can be completed in your driveway with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the Pontiac G6, the TCM is conveniently located at the driver’s side (LH) strut tower in the engine bay. It’s typically a silver box with two large electrical connectors.
- Disconnect and Remove: Carefully unclip the two wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the two wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and allow it to run for a few minutes. While the system often resets itself, using a basic OBD2 scan tool to clear any stored codes is recommended.
Verified Fitment Across a Range of GM Vehicles
While this is the ideal solution for your Pontiac G6, this T42 TCM is also compatible with a wide array of other General Motors vehicles. Please verify your model and location notes below.
This part will fit these makes and models with these options:
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- AVALANCHE 1500 07-08 Transmission; (next to battery)
- AURA 07-09 Transmission; (LH frame rail front)
- CANYON 08-12 Transmission; (RH rear engine compartment)
- COBALT 06-10 Transmission; (LH strut tower)
- COLORADO 08-12 Transmission; (RH rear engine compartment)
- DTS 06-11 Transmission; (RH front engine compartment)
- ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
- ENVOY 08-09 Transmission; (LH engine compartment)
- ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
- EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
- G5 07-10 Transmission; (LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- HHR 06-11 Transmission; (LH engine compartment)
- HUMMER H3 08-10 Transmission; (RH rear engine compartment)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- ION 06-07 Transmission; (behind LH strut tower)
- LACROSSE 06-09 Transmission; (lower air cleaner housing)
- LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
- LUCERNE 08-11 Transmission; (LH engine compartment)
- MALIBU 06-10 Transmission; (LH frame rail)
- MONTANA 06-09 Transmission; (LH strut tower)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- PURSUIT 06 Transmission; (LH strut tower)
- RAINIER 06-07 Transmission
- RENDEZVOUS 06-07 Transmission; (air cleaner box)
- SAAB 9-7X 06-09 Transmission; (LH engine compartment)
- SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
- SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
- SIERRA 1500 PICKUP 08 Transmission; (next to battery)
- SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
- SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
- SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
- SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
- SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
- SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
- SSR 05-06 Transmission; (front LH frame)
- SUBURBAN 1500 07-08 Transmission; (next to battery)
- TAHOE 07 Transmission; (next to battery)
- TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
- TERRAZA 06-07 Transmission; (LH strut tower)
- TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
- TRAILBLAZER 08-09 Transmission; (LH engine compartment)
- TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
- UPLANDER 06-09 Transmission; (LH strut tower)
- VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
- VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
- VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
- VUE 10 Transmission
- YUKON 07 Transmission; (next to battery)
- YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
- YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
- YUKON XL 1500 07-08 Transmission; (next to battery)
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS
Frequently Asked Questions
Does this module require programming at a dealership?
No, it does not. We pre-program the module to your vehicle’s VIN before shipping. This means it’s ready for installation right out of the box, saving you time and money.
Is this a difficult part to install myself?
Not at all. For the Pontiac G6, this is a very accessible part located on the driver’s side strut tower. With basic hand tools and our guide, most DIYers can complete the job in under 30 minutes.
What is ‘limp mode’?
Limp mode is a safety feature where the TCM forces the transmission into a single gear (usually 2nd or 3rd) to prevent further damage when a serious fault is detected. This allows you to ‘limp’ the car to a safe location for repair.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming.
What kind of warranty is included?
This module comes with a one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.