Restore Your Cobalt’s Shifting Performance
Is your 2006-2010 Chevrolet Cobalt suffering from harsh shifting, getting stuck in gear, or displaying transmission-related warning lights? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it begins to fail, it can cause a host of drivability issues, from poor fuel economy to leaving you stranded in limp mode.
This genuine GM T42 Transmission Control Module, service number 24238856, is the definitive solution to restore your vehicle’s factory performance. We take the guesswork and extra expense out of the repair by pre-programming the module to your vehicle’s specific VIN. This means it arrives ready for a straightforward, plug-and-play installation without requiring a costly trip to the dealership for programming. It’s designed to resolve common diagnostic trouble codes (DTCs) like P0700 and various solenoid codes right out of the box.
From the Diagnostic Bay
We recently had a 2008 Cobalt come into the shop with classic symptoms: erratic shifting and a P0752 code for a stuck shift solenoid. The owner had already spent a few hundred dollars replacing the solenoid pack, but the problem persisted. After a quick diagnostic, we identified the real culprit: the original TCM was sending faulty signals. We installed one of our VIN-programmed T42 modules, cleared the codes, and the car shifted perfectly on the test drive. It’s a common scenario where diagnosing the root cause saves time and money, and in many GM vehicles of this era, the TCM is that cause.
Identifying a Faulty Cobalt Transmission Control Module
A failing TCM can manifest in several ways. If you’re experiencing any of the following issues, it’s highly likely your module needs replacement. Ignoring these symptoms can lead to more significant transmission damage over time.
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are present.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Intermittent loss of communication with the transmission.
Plug-and-Play Reliability for Your GM Vehicle
This module is not just for the Cobalt; it’s a versatile component for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. Built to strict OEM standards, it ensures lasting durability and reliable performance. Installation is simple for a DIY mechanic or professional technician. On a Chevrolet Cobalt, the TCM is typically located on the driver’s side strut tower in the engine bay. Simply disconnect the battery, unbolt the old module, disconnect the wiring harnesses, and install the new one. No core charge means you can keep your old part without any hassle.
Frequently Asked Questions
What does “VIN Programmed” mean for my Cobalt?
VIN programming means we load your vehicle’s specific identification number and the latest GM software onto the module before shipping it. This ensures it communicates perfectly with your car’s engine computer and other systems, just like the original part, for optimal performance without needing dealership tools.
Is this TCM difficult to install myself?
For most individuals with basic mechanical skills, the installation is straightforward. On the 2006-2010 Cobalt, it’s located in an accessible spot on the LH strut tower. The process typically takes under 30 minutes and requires only basic hand tools. Always disconnect the battery before starting.
Will this module fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, it’s crucial to scan for other specific transmission codes (e.g., P07xx) to confirm the diagnosis.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep or dispose of your old module without any additional fees or hassle.
What other vehicles does this part fit?
This T42 TCM is compatible with a wide array of GM vehicles from roughly 2006-2014, including models like the Chevrolet Impala, HHR, Silverado; GMC Sierra, Yukon; Pontiac G6; and Saturn Vue. Please verify the part number or use our vehicle fitment tool to ensure compatibility.