Restore Peak Performance to Your GM Truck or SUV
Is your truck plagued by a persistent check engine light, erratic shifting, or frustrating no-start conditions? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty module keep you off the road. This replacement PCM, part number 12602802, is the reliable, straightforward solution to restore your vehicle’s performance and drivability.
This isn’t just a generic part off the shelf. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after your purchase, and our technicians will flash the unit with the latest, most stable software updates directly from GM. This ensures seamless communication between the module and your vehicle’s systems, just like the original factory unit.
From the Diagnostic Bay
We had a 2005 Silverado 2500 come in on a tow truck. The owner was frustrated because it would crank but never start, and he’d already replaced the battery and fuel pump. After connecting our scan tool, we found no communication with the engine computer. We located the PCM under the battery tray and found clear signs of corrosion on the housing and connectors from a leaking battery. Instead of a costly trip to the dealer for a new module and programming, we sourced this exact pre-programmed unit. Once it arrived, the physical swap took less than 20 minutes. After performing the security relearn, the truck fired right up and ran smoother than it had in years. It’s a perfect example of how the right part, properly prepared, can save hundreds in diagnostic and labor costs.
Is Your GM Truck Showing Signs of a Failing PCM?
A failing PCM can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM could be the culprit. This replacement 2003-2007 Sierra PCM is designed to correct these common issues:
- ✔ Unexplained Check Engine Light (CEL) with various trouble codes.
- ✔ Rough idling, engine stalling, or hesitation during acceleration.
- ✔ Harsh or inconsistent automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete no-start condition where the engine cranks but won’t turn over.
- ✔ Communication errors when trying to use a diagnostic scan tool.
- ✔ False warnings on the instrument cluster.
VIN-Programmed for a Hassle-Free Installation
The biggest hurdle in replacing a modern vehicle computer is the programming. This module eliminates that step. By flashing it to your VIN, we ensure it has the correct software for your truck’s specific engine, transmission, and emissions equipment. This direct-fit, pre-programmed 2003-2007 Sierra PCM is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. After installation, a simple security relearn procedure (often called a key relearn) is typically all that’s needed to sync the new module with your vehicle’s anti-theft system. This can usually be done in your own driveway without special tools.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, including fuel injection, ignition timing, and shift points, to ensure optimal performance, fuel efficiency, and emissions control.
Is this PCM ready to install when I receive it?
Yes, this module comes pre-programmed to the VIN you provide. This means the core software is installed. After the physical installation, you will need to perform a security relearn procedure to sync the module with your vehicle’s keys and anti-theft system.
Where do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive and program it with this information.
What is the security relearn procedure?
It’s a simple procedure that syncs the new PCM to your vehicle. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Specific instructions for your vehicle can be easily found online or in a repair manual.
How can I be sure this part fits my vehicle?
Please review the detailed fitment list on this page. This module fits a wide range of GM trucks and SUVs from 2003-2007. Matching your original part number to one of the compatible service numbers (like 12602802) is the best way to confirm compatibility.