2001-2005 Silverado 3500 Transmission Module Programmed | 09385220

End Harsh Shifting & Limp Mode

Restore your truck’s performance with a reliable, pre-programmed Transmission Control Module for 2001-2005 Silverado & Sierra HDs. This module is flashed to your VIN, eliminating the need for expensive dealer programming. It’s the direct-fit solution for fixing erratic shifting, limp mode, and common transmission codes. Get back on the road with confidence. Order now to restore your Allison transmission’s smooth operation!

$500.00

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 591-06773-7 Categories: ,
Guaranteed Safe Checkout

Restore Flawless Shifting to Your GM HD Truck

Is your 2001-2005 Silverado or Sierra HD suddenly shifting harshly, getting stuck in limp mode, or throwing confusing transmission codes? As a technician with over two decades of experience under the hood of these workhorses, I can tell you that the Transmission Control Module (TCM) is often the root cause. The Allison 1000 transmission is legendary for its strength, but its electronic brain, the TCM, is susceptible to failure from years of heat and vibration. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded, especially when towing or hauling.

This replacement Silverado 3500 Transmission Module is the definitive solution to get your truck back to operating as it should. We take the guesswork and dealership hassle out of the equation. Before this module ships, we will flash it with the latest GM-certified software, specifically matched to your truck’s VIN. This means no expensive programming appointments are needed. It’s a direct-fit, ready-to-install part that restores the precise, reliable shifting you depend on.

From the Diagnostic Bay: The Misleading Solenoid Code

I once had a 2004 Sierra 2500HD in my shop that was driving the owner crazy. It kept throwing a code for a faulty shift solenoid (a common P0751 or similar) and would intermittently go into limp mode. The owner had already spent a small fortune at another shop replacing solenoids inside the transmission pan, but the problem always came back. After a 10-minute inspection, I knew the issue wasn’t in the pan. The TCM, mounted on the fan shroud, showed signs of heat stress. We installed a VIN-programmed TCM, and the problem was solved instantly. The faulty module was sending bad signals, making a perfectly good solenoid appear faulty. This part saves you from chasing ghosts in the machine.

Is Your Truck Showing These Symptoms?

  • ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0602, or U0101.
  • ✔ Harsh, erratic, or delayed shifting between gears.
  • ✔ The transmission gets stuck in one gear (often 3rd), a condition known as “limp mode.”
  • ✔ The gear indicator on the dashboard displays incorrectly or not at all.
  • ✔ A complete loss of communication with the transmission module, preventing diagnostics.
  • ✔ Decreased fuel economy due to inefficient shifting patterns.

A Straightforward Guide to Installation

Replacing the TCM on these trucks is a job most DIYers can handle with basic tools. The module is conveniently located, making access simple. Here’s a general guide:

  1. Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
  2. Locate the TCM: Open the hood and find the TCM mounted to the driver’s side of the fan shroud. It’s a silver box with large electrical connectors.
  3. Disconnect Connectors: Carefully unclip and remove the large electrical harness connectors from the old module. Inspect them for any corrosion or damage.
  4. Unbolt the Module: Using a socket wrench, remove the bolts securing the TCM to its mounting bracket on the fan shroud.
  5. Install the New Module: Mount your new, pre-programmed Silverado 3500 Transmission Module onto the bracket and tighten the bolts securely.
  6. Reconnect and Finalize: Firmly plug the electrical connectors back into the new TCM until they click. Reconnect your battery terminal. Start the truck and verify that the check engine light is off and shifting has returned to normal.

Guaranteed Fitment for Your GM HD Truck

This module is a direct replacement for units in the following vehicles equipped with the 5-speed Allison automatic transmission (RPO Code M74). Please verify your vehicle and options match before ordering. This part is compatible with numerous service numbers, including 15768288, 15163072, 29537441, and 09385220.

  • 2001-2005 Chevrolet Silverado 2500 HD / 3500 (with 5-Speed Allison AT, opt M74)
  • 2001-2005 GMC Sierra 2500 HD / 3500 (with 5-Speed Allison AT, opt M74)

Frequently Asked Questions About This Silverado 3500 Transmission Module

Do I need to do any programming after I install it?
No. This module arrives pre-programmed to the specific VIN you provide at checkout. It is a true plug-and-play solution, saving you a trip to the dealership.
How do I provide my VIN number?
After you complete your purchase, you will need to send us a message with your vehicle’s 17-digit VIN. We cannot ship the part until we receive this information for programming.
Will this fix my truck being stuck in limp mode?
In a vast majority of cases, a faulty TCM is the direct cause of limp mode in these trucks. If your vehicle is displaying the symptoms listed above, this module is the most likely solution.
Is this a new or used part?
This is a high-quality, inspected, and tested replacement part that has been prepared with fresh, vehicle-specific software to ensure reliable performance.
Where is the TCM located on my 2003 Silverado 3500?
The Transmission Control Module is located in the engine bay, mounted directly to the driver’s side (LH) of the radiator fan shroud for cooling.
Genuine OEM

Yes

MPN

09385220

Interchange part number

Condition

Refurbished

PartNumber

591

Model

Silverado 3500 Pickup

Make

Year

2005

Brand

CHEVROLET TRUCK

Manufacturer Part Number

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