End Frustrating Shifting Problems in Your Pontiac G5
If you’re dealing with a 2007-2010 Pontiac G5 that’s shifting erratically, banging into gear, or stuck in limp mode, the culprit is very often a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless drivers worry they need a full transmission rebuild when the real issue was this small electronic brain. This OEM-quality T42 TCM, corresponding to part number 24243901, is the definitive, reliable fix that restores your car’s drivability and peace of mind.
The TCM is the nerve center of your automatic transmission. It processes data from engine and wheel speed sensors to command precise, smooth gear changes and manage torque converter lockup for optimal fuel economy. When it fails, communication breaks down, leading to the jarring and unpredictable performance you’re likely experiencing. This replacement module is meticulously prepared to solve those issues right out of the box.
A Technician’s Notebook: The G5 Stuck in Second Gear
A customer brought in their 2008 Pontiac G5, complaining it wouldn’t shift past second gear and the check engine light was on. They were quoted over $3,000 for a transmission overhaul at another shop. My first step was to pull the codes—a classic P0700 (Transmission Control System Malfunction) was stored. Instead of jumping to the worst-case scenario, I checked the TCM. In these G5 models, heat cycling and vibrations at the strut tower location can cause internal solder joints to fail over time. We installed one of our VIN-programmed modules, cleared the codes, and took it for a test drive. It shifted perfectly through all gears. The customer saved thousands and drove away in a car that felt brand new again. This is a common story for this specific part.
Is Your Pontiac G5 Exhibiting These Shifting Problems?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. A new 2007-2010 Pontiac G5 TCM is often the most direct path to a solution.
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-series solenoid codes, or communication errors.
- ✔ A sudden drop in fuel efficiency.
- ✔ The transmission seems to slip out of gear or fails to engage properly from Park or Neutral.
Your 30-Minute G5 TCM Installation Guide
One of the best parts about this solution is its simplicity. For the DIY enthusiast or professional mechanic, swapping the TCM is a quick job that requires basic hand tools. No need for complex dealer-level equipment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the Pontiac G5, the TCM is conveniently located on the driver’s side of the engine bay, mounted to the left-hand (LH) strut tower. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. There are typically two or three small bolts holding it in place.
- Install the New Module: Bolt the new, pre-programmed TCM onto the strut tower bracket. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. While the system may reset on its own, it’s best practice to use a basic OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the car and enjoy smooth shifting!
Guaranteed Fitment for Your Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this listing focuses on the 2007-2010 Pontiac G5 TCM, it is also compatible with the following models. Please verify your vehicle and the module’s location before ordering.
- ✔ Pontiac G5 (07-10): Transmission; (LH strut tower)
- ✔ Chevrolet Cobalt (06-10): Transmission; (LH strut tower)
- ✔ Chevrolet HHR (06-11): Transmission; (LH engine compartment)
- ✔ Pontiac G6 (06-10): Transmission; (LH strut tower)
- ✔ Saturn Ion (06-07): Transmission; (behind LH strut tower)
- ✔ And many more GM models from 2006-2014. This module is interchangeable with part numbers 24252114, 24234503, 24230461, 24243901, and others.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems, eliminating the need for an expensive programming session at a dealership. It’s a true plug-and-play fix.
Do I need any special tools for installation?
No. Basic hand tools like a socket set and ratchet are all you need to unbolt the old module and install the new one. The most technical tool recommended is a basic OBD2 scanner to clear codes, which is a valuable tool for any car owner.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.
Will this fix a P0700 trouble code?
In many cases, yes. The P0700 code is a general code indicating a fault within the transmission control system. If the root cause is a failing TCM, replacing it with this programmed module will resolve the issue and allow the code to be cleared permanently.