Get Your Heavy-Duty Truck Shifting Like New
Is your 2001-2005 Sierra or Silverado HD struggling with harsh shifts, getting stuck in gear, or throwing transmission codes? A failing Transmission Control Module (TCM) can cripple your truck’s performance, turning a reliable workhorse into a source of constant frustration. Don’t let a faulty module sideline your vehicle. This direct-replacement TCM is the definitive solution to restore the crisp, reliable shifting you depend on, arriving pre-programmed specifically for your truck’s VIN.
Common Allison Transmission Problems & Your Solution
A failing TCM is the root cause of many frustrating issues with the legendary Allison 1000 5-speed transmission. If you’re experiencing any of the following symptoms, this module is the solution you need to get back on the road with confidence. This expertly prepared 2001-2005 Allison TCM is designed to resolve these exact problems.
- Harsh or erratic shifting, especially when towing or under load.
- The transmission entering “limp mode,” often stuck in 3rd gear.
- Delayed engagement when shifting into Drive or Reverse.
- A flashing “Tow/Haul” light or a persistent Check Engine Light.
- Common Diagnostic Trouble Codes (DTCs) such as P0700, P0751, P0756, or U0101.
Features & Tangible Benefits
- โ Programmed to Your VIN: This module arrives ready for installation. We flash it with the latest GM software using your specific vehicle identification number, eliminating the need for an expensive trip to the dealership for programming.
- โ Restored Drivability: By installing a module with the newest factory updates, you often fix underlying software bugs, resulting in smoother shift logic and improved transmission performance.
- โ Guaranteed Compatibility: This unit is a direct replacement for a wide range of original service numbers, including 15768288, 15169833, and 15187103, ensuring a perfect fit and function for your truck.
- โ Simple Installation: Located on the driver’s side fan shroud, this module is easily accessible for a straightforward swap, getting your truck back to work faster. A properly prepared 2001-2005 Allison TCM is key to a fast repair.
- โ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
From the Mechanic’s Bay
“We see these trucks in the shop all the time. A customer comes in with a transmission that’s acting up, and their first thought is a costly internal failure. Nine times out of ten on these 2001-2005 Duramax trucks, the issue is electronic, not mechanical. The biggest mistake people make is buying a used, non-programmed module. They install it, the truck still won’t shift right, and then they have to pay for a tow to a shop with the right equipment. This pre-programmed 2001-2005 Allison TCM saves you that headache. It’s the exact fix we’d perform in our bayโa reliable part, flashed with the right software, ready to solve the problem the first time.”
Frequently Asked Questions
Is this part truly plug-and-play?
Yes. Because we program the module to your truck’s specific VIN before shipping, it is ready for installation right out of the box. No further programming or dealer visits are required.
How do I provide my vehicle’s VIN?
After you complete your purchase, we will contact you for your 17-digit VIN. Alternatively, you can add your VIN to the notes section during checkout. We cannot ship your part until we have this information to ensure correct programming.
Where is the TCM located on my truck?
On the 2001-2005 Silverado and Sierra HD models, the Transmission Control Module is typically mounted on the driver’s side (LH) of the radiator fan shroud for cooling.
Will this fix my specific shifting problem?
This module is the most common solution for electronic-related shifting issues in the 5-speed Allison transmission. While it resolves the vast majority of problems, we always recommend proper vehicle diagnostics to confirm the TCM is the point of failure.
Does this part require a transmission relearn procedure?
The Allison transmission uses an adaptive learning strategy. After installation, the module will adjust to your driving style over the first 50-100 miles. Driving normally is typically all that is required for the system to fully adapt.