Are you fighting with a transmission that seems to have a mind of its own? Frustrating, harsh shifts, getting stuck in gear, or a persistent check engine light can make driving your truck or SUV a stressful experience. Restore the smooth, reliable performance your vehicle was built for with this OEM-quality GM T42 Transmission Control Module (TCM), pre-programmed specifically to your vehicle’s VIN for a true plug-and-play solution.
Common Symptoms & Your Solution
A failing TCM can cause a cascade of problems that are often misdiagnosed as major transmission failure. If you’re experiencing any of the following, this module is the definitive fix:
- Harsh, erratic, or delayed gear shifts
- The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light is on with codes like P0700, P0750, or other solenoid-related DTCs
- Failure to upshift or downshift correctly
- Noticeable decrease in fuel economy
- Intermittent loss of communication with the transmission
This VIN Programmed GM T42 TCM is engineered to resolve these issues by precisely managing shift points, torque converter clutch engagement, and line pressure, bringing your transmission’s performance back to factory standards without a trip to the dealership.
Key Features & Tangible Benefits
- ✔ Plug-and-Play Installation: We program the module to your vehicle’s specific VIN before shipping. This means no expensive dealer programming is required—simply install it, and you’re ready to go.
- ✔ Restored Drivability: Eliminates rough shifting and gear-hunting, providing the smooth, predictable performance you rely on for towing, hauling, or daily commuting.
- ✔ Solve Annoying Warning Lights: Directly addresses the root cause of many transmission-related diagnostic trouble codes, allowing you to clear that check engine light for good.
- ✔ OEM-Standard Quality: Built to meet or exceed General Motors’ strict specifications, ensuring long-lasting durability and reliable operation under all driving conditions.
- ✔ Guaranteed Performance: This unit is backed by our one-year replacement warranty.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core.
Expert Insight: The Power of Pre-Programming
Many drivers buy a standard TCM online only to discover it won’t work without a separate, costly programming session at a dealership, which can add $150 or more to the repair bill. Our process eliminates that hidden cost and frustration. By programming the module with the latest GM software updates matched to your VIN, we ensure it communicates perfectly with your vehicle’s other computers (like the ECM and BCM) from the moment you connect it. This VIN Programmed GM T42 TCM isn’t just a part; it’s a complete, cost-effective solution.
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we load the module with the specific software and calibration files from General Motors that match your vehicle’s unique Vehicle Identification Number (VIN). This ensures the TCM works perfectly with your engine, options, and transmission type right out of the box.
Do I need to take my vehicle to a dealer after installation?
No. Our VIN programming service completely eliminates the need for any additional programming or setup at a dealership, saving you time and money.
Is this TCM compatible with my 4L60E transmission?
Yes, this T42 module is the correct controller for a wide range of GM vehicles equipped with 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E. Please verify your vehicle in the fitment list.
Where is the T42 TCM located on a GMC Sierra or Chevy Silverado?
On most 2007-2013 Sierra and Silverado trucks, the TCM is conveniently located in the engine compartment, typically mounted next to the battery. Installation usually takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the underlying issue causing the P0700, it’s essential to diagnose any other specific codes that are present (e.g., solenoid codes) to confirm the TCM is the root cause.
Is a core charge required for this part?
No, there is absolutely no core charge. You can keep or dispose of your old module without any extra fees or hassle.