Restore Your Pontiac’s Shifting with a Programmed T42 TCM
If your 2007-2010 Pontiac G5 is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. Don’t let a faulty module sideline your car or lead to an expensive, unnecessary transmission replacement. This OEM-quality T42 Transmission Control Module, part number 24238856, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
I remember a 2008 Pontiac G5 that came into my shop stuck in what the owner called “get home mode”—it wouldn’t shift out of 3rd gear. The check engine light was on, and a generic code reader pulled a P0700 (Transmission Control System Malfunction). Another shop had quoted them over $3,000 for a transmission rebuild. After a quick 10-minute scan with my professional tool, I saw specific communication loss codes pointing directly to the TCM. The internal processor had failed, a common issue in these units after years of heat cycles. We installed one of our VIN-programmed modules, and in under 30 minutes, the car was shifting perfectly. The customer saved thousands and drove away with a reliable fix. This isn’t just a part; it’s the right diagnosis and the right solution.
Is Your G5 Showing These Symptoms?
A failing TCM sends clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement:
- ✔ Harsh, clunky, or delayed gear shifts.
- ✔ Vehicle is stuck in limp mode (often 2nd or 3rd gear).
- ✔ The transmission warning light or check engine light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A complete loss of communication with the TCM when scanned.
- ✔ Poor acceleration and decreased fuel economy.
Replacing your faulty module with our 2007-2010 G5 Transmission Module is the most effective way to resolve these issues and restore your vehicle’s factory performance.
Your 30-Minute Path to a Smooth Ride
This is a repair you can confidently tackle in your own driveway. No specialized tools are needed, and our VIN programming means you skip the dealership entirely. For the Pontiac G5, the TCM is easily accessible.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts.
- Locate the Module: On the Pontiac G5, the TCM is typically found mounted to the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts or nuts holding the old module in place.
- Install the New Module: Mount your new, pre-programmed TCM and securely fasten it. Reconnect the electrical harnesses until they click.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, clear any stored codes. Take the car for a test drive to confirm the smooth shifting.
Verified Vehicle Compatibility
While this is a perfect fit for the 2007-2010 G5 Transmission Module, this T42 unit is also compatible with a wide range of other General Motors vehicles. Please verify your part number (24238856) or check the list below.
This part will fit these makes and models with these options:
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- AURA 07-09 Transmission; (LH frame rail front)
- AVALANCHE 1500 07-08 Transmission; (next to battery)
- 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)
- EXPRESS 1500/2500/3500 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 06-11 Transmission; (LH engine compartment)
- MALIBU 06-10 Transmission; (LH frame rail)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- MONTANA 06-09 Transmission; (LH strut tower)
- 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 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
- SIERRA & SILVERADO 1500/2500 07-13 (Check notes for specific options)
- SSR 05-06 Transmission; (front LH frame)
- SUBURBAN 1500 07-08 Transmission; (next to battery)
- TAHOE 07-09 Transmission; (next to battery)
- TERRAZA 06-07 Transmission; (LH strut tower)
- TRAILBLAZER 06-09 Transmission; (LH engine compartment)
- UPLANDER 06-09 Transmission; (LH strut tower)
- VUE 07-10 Transmission; (Check notes for specific options)
- YUKON & YUKON XL 1500 07-09 Transmission; (next to battery)
Frequently Asked Questions
Does this module need to be programmed by a dealer?
Absolutely not. We pre-program the module to your car’s VIN before shipping. This ensures it is 100% ready for installation right out of the box, saving you hundreds in dealership fees.
Where is the TCM located on my 2009 Pontiac G5?
For the 2007-2010 Pontiac G5, the Transmission Control Module (TCM) is located in the engine bay, bolted to the driver’s side (LH) strut tower. It’s easily accessible once you open the hood.
Will this fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating a problem within the transmission control system. A failing TCM is one of the most common root causes for this code. Replacing the module often clears the P0700 and any related specific codes.
Is this a difficult part to install for a DIYer?
Not at all. This is considered a beginner-friendly repair. With basic hand tools and our installation guide, most people can complete the job in under 30 minutes. The biggest benefit is that no computer programming is required on your end.
What is the warranty on this part?
This module comes with a one-year warranty, giving you confidence and peace of mind in your repair. It’s built to meet or exceed OEM specifications for long-lasting reliability.