If your 2007-2010 Pontiac G5 is suffering from unpredictable shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’re not alone. I’ve seen this countless times in my 20 years on the shop floor. The Transmission Control Module (TCM), the electronic brain of your automatic transmission, is a common failure point. This VIN-programmed T42 TCM, part number 24239926, is the direct, reliable solution to get your G5 driving smoothly again without a costly trip to the dealership.
This isn’t just a replacement part; it’s a complete fix. We handle the programming for you. By providing your vehicle’s VIN at checkout, we load the latest GM software directly onto the module. When it arrives, it’s ready to install right out of the box. This simple swap restores precise shift commands, proper torque converter lockup, and clear communication with the engine computer, eliminating the frustrating symptoms of a faulty TCM.
A Technician’s Notebook
A customer brought in their 2008 Pontiac G5, convinced the transmission was shot. It was slamming into gear and wouldn’t shift past 2nd. The quote from another shop was for a full transmission rebuild—thousands of dollars. I hooked up my scan tool and saw a classic P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Experience told me to check the TCM first. The module, located on the LH strut tower, showed signs of internal failure. We installed one of our pre-programmed T42 modules. In less than an hour, the car was shifting perfectly. The customer saved a fortune by correctly diagnosing an electronic failure instead of a mechanical one.
Is Your Pontiac G5 Showing These Transmission Red Flags?
A failing TCM can mimic a major mechanical problem. Before you suspect the worst, check if you’re experiencing these common electronic symptoms. A new 2007-2010 G5 Transmission Control Module is often the fix.
- âś” Harsh, banging shifts or delayed gear engagement.
- âś” Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults are present.
- âś” Inconsistent or no shifting, leading to poor acceleration and bad fuel mileage.
- âś” Complete loss of communication with the TCM, preventing the vehicle from starting or shifting out of Park.
Your 30-Minute Path to a Smooth Ride
This installation is straightforward enough for a confident DIYer. For the 2007-2010 Pontiac G5, the TCM is conveniently located and easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the Pontiac G5, the TCM is typically mounted to the driver’s side (LH) strut tower in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the locking tabs to avoid damage. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses securely until they click.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. Use a basic OBD2 scanner to clear any stored fault codes from the ECU. Test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
This T42 TCM, interchangeable with part numbers like 24252114, 24234503, and 24239926, is the correct component for a wide range of GM vehicles. While this page focuses on the 2007-2010 G5 Transmission Control Module, it also fits the following models. Always verify by part number or contact us with your VIN.
- Pontiac: G5 (2007-2010), G6 (2006-2010), Grand Prix (2006-2008), Pursuit (2006), Solstice
- Chevrolet: Cobalt (2006-2010), HHR (2006-2011), Impala (2006-2011), Malibu (2006-2010), Monte Carlo (2006-2007), Silverado, Tahoe, Express Van
- Saturn: Aura (2007-2009), Ion (2006-2007), Vue (2007-2010)
- Buick: LaCrosse/Allure (2006-2009), Lucerne (2006-2011)
- GMC: Sierra, Yukon, Savana Van, Canyon
- …and many other GM models from 2006-2014.
Frequently Asked Questions
Do I need to take my car to a dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership programming, making it a true plug-and-play installation.
Is this part difficult to install on a Pontiac G5?
Not at all. For the G5, the TCM is located on the driver’s side strut tower, making it one of the easier locations. With basic hand tools, the swap can be done in under 30 minutes.
What is a “core charge” and do you require one?
A core charge is a deposit you pay until you return your old part. We do not have a core charge on this item, so you can keep your old module without any hassle or extra cost.
How do I know for sure that the TCM is the problem?
Common signs include harsh shifting, getting stuck in gear, and specific transmission codes like P0700. If your symptoms match the list provided and your mechanic has ruled out wiring or solenoid issues, the TCM is the most likely culprit.
Will this fix my check engine light?
Yes, if the check engine light is on due to codes related to a failing TCM (like P0700 or solenoid circuit faults), replacing the module with this pre-programmed unit will resolve the underlying issue and allow the codes to be cleared.