Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2007 Sierra 1500, Silverado, or other GM vehicle suffering from frustrating issues like a persistent check engine light, rough idling, poor fuel economy, or even a no-start condition? Before you assume the worst, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can cause a cascade of confusing problems. This module, part number 28042802, is the direct-fit, reliable solution to get your truck back to running the way it should.
Case Study: The Ghost in the Machine
I remember a 2006 Silverado 2500 that came into my shop with a laundry list of intermittent problems. The owner was frustrated; he’d been chasing a random misfire (P0300), occasional harsh shifting, and a flickering check engine light for weeks. One day it would run fine, the next it wouldn’t. We checked grounds, sensors, and wiring harnesses—all tested good. After hooking up my high-end scan tool, I noticed the live data stream would occasionally drop out completely. That’s a classic sign of an internal PCM failure. Instead of a costly and time-consuming trip to the dealership, we ordered a pre-programmed PCM. The install took less than 30 minutes, and the truck has run flawlessly ever since. This isn’t just a part; it’s a permanent fix for those ghost-in-the-machine electrical gremlins.
Is Your Truck Showing These Telltale Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) for internal module failure, such as P0601, P0602, P0605, or P0606
- ✔ Unexplained drop in fuel mileage
- ✔ Engine stalling, stumbling, or rough idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Intermittent no-start or difficulty starting
- ✔ Failure to communicate with OBD-II scan tools
The Smart Solution: Pre-Programmed for Your Vehicle
The biggest headache with replacing a modern vehicle’s computer is the programming. Dealerships charge a premium for this service. We eliminate that step entirely. When you purchase this 2003-2007 Sierra 1500 PCM, we flash it with the latest official GM software updates, specifically matched to your vehicle’s unique VIN. This ensures perfect compatibility with your engine, transmission, and all factory options. It arrives at your door ready for a straightforward installation, saving you time, money, and a trip to the dealer.
A Straightforward Guide to Installation
Even if you’re a weekend DIYer, you can handle this job. The PCM is typically located in the engine bay on the driver’s side, right under the battery tray.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Access the Module: You will likely need to remove the battery and the plastic battery tray to gain clear access to the old PCM.
- Disconnect the Old PCM: Carefully unplug the electrical connectors. These GM connectors have locking tabs that need to be released before you can pull them out. Never force them.
- Swap the Modules: Unbolt the old PCM from its mounting bracket. Install the new, pre-programmed module in its place.
- Reconnect Everything: Securely plug the electrical connectors into the new PCM until they click. Reinstall the battery tray and the battery, then reconnect the negative battery terminal.
- Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, and 89017734. It fits a wide range of GM trucks and SUVs, including:
- Chevrolet Avalanche 1500: 2003-2006
- Chevrolet Silverado 1500/2500/3500: 2003-2007 (Classic body style)
- Chevrolet Suburban 1500/2500: 2003-2006
- Chevrolet Tahoe: 2003-2006
- Chevrolet SSR: 2003
- Chevrolet Trailblazer EXT: 2003 (5.3L)
- GMC Sierra 1500/2500/3500: 2003-2007 (Classic body style)
- GMC Sierra Denali: 2003-2007 (Classic body style)
- GMC Yukon & Yukon XL 1500/2500: 2003-2006
- GMC Envoy XL: 2003 (5.3L)
- Cadillac Escalade, ESV, EXT: 2003-2006
- Hummer H2: 2003-2007
- Isuzu Ascender: 2003 (5.3L)
Note: Please verify your specific options (e.g., engine size, service ID) to ensure a perfect match. When in doubt, send us your VIN!
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. We will flash it with the latest GM software using the VIN you provide, making it ready for installation right out of the box.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. PCM (Powertrain Control Module) is most accurate for these GM trucks as it controls both the engine and transmission. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to a computer that only manages engine functions.
Is the security relearn procedure difficult?
Not at all. It’s a simple key-cycle procedure that takes about 30 minutes and requires no special tools. It allows your vehicle’s anti-theft system to synchronize with the new PCM. We can provide general instructions upon request.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls transmission line pressure and shift points based on data from various sensors. If the PCM is faulty, it can cause harsh shifts, delayed shifting, or failure to shift. This module can resolve those issues if the PCM is the root cause.