Is Your Pontiac G5 Shifting Erratically or Stuck in Gear?
A faulty Transmission Control Module (TCM) can turn a reliable daily driver into a source of constant frustration. The TCM is the electronic brain of your vehicle’s automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and ensuring smooth, efficient operation. When it begins to fail in your 2007-2010 Pontiac G5, you’ll notice a significant decline in performance, from jarring shifts to being stuck in a single gear, commonly known as “limp mode.” This isn’t just an inconvenience; it can be a serious safety issue and lead to more costly transmission damage if ignored.
From the Diagnostic Bay
We recently had a 2008 Pontiac G5 towed in with the check engine light on and the transmission refusing to shift past second gear. The owner was worried about a complete transmission failure. Our scan tool pulled a P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. Instead of jumping to a costly internal repair, we checked the TCM. After confirming the module was the culprit, we installed one of our VIN-programmed T42 modules. In under 30 minutes, the car was back on the road, shifting perfectly, with all codes cleared. The customer was relieved to avoid a multi-thousand dollar transmission rebuild with this straightforward, effective solution.
Symptoms of a Failing Pontiac G5 TCM
If your vehicle’s computer is sending distress signals, it’s time to pay attention. A failing TCM will often manifest through a clear set of symptoms that disrupt your driving experience. Look out for these common warning signs:
- ✔ Harsh or Delayed Shifting: Experiencing abrupt, clunky gear changes or a noticeable lag when the transmission tries to shift.
- ✔ Stuck in Limp Mode: The vehicle may refuse to shift out of 2nd or 3rd gear as a protective measure, severely limiting your speed.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes associated with a bad TCM include P0700, P0750, P0753, P0758, and other solenoid-related faults.
- ✔ Poor Fuel Economy: Inefficient shifting patterns cause the engine to work harder, leading to a noticeable drop in gas mileage.
- ✔ Complete Loss of Shifting: In severe cases, the transmission may not engage or shift at all, leaving you stranded.
The Plug-and-Play Solution: Pre-Programmed for Your Vehicle
Replacing a TCM used to mean a trip to the dealership for expensive programming. Our GM T42 Transmission Control Module eliminates that step entirely. We program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it communicates perfectly with your car’s engine control unit (ECU) and other systems right out of the box. Simply install it, and you’re ready to go. This module is built to meet or exceed original equipment standards, providing a dependable and lasting repair for your transmission woes.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, and the specific service number 24240449.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. This makes it a true plug-and-play installation, saving you time and the high cost of dealership programming.
Where is the TCM located on a 2007-2010 Pontiac G5?
On the Pontiac G5, the Transmission Control Module is typically found in the engine bay, mounted on the driver’s side (LH) strut tower for easy access.
Will this part fix a P0700 diagnostic code?
A P0700 code indicates a general fault within the transmission control system. While a faulty TCM is a very common cause for this code, it’s essential to perform a full diagnostic. However, if you are also experiencing shifting problems, replacing the TCM is often the correct solution.
Is this an OEM part?
This is a high-quality replacement part built to strict OEM specifications to ensure proper fit, function, and long-term reliability for your vehicle.
Do I need to return my old TCM? (Core Charge)
No core charge is required. You can keep your old part, eliminating the hassle and expense of shipping it back.