Restore Peak Performance to Your GM Truck with a VIN-Programmed PCM
Is your GMC Yukon, Sierra, or Tahoe acting up? Frustrating issues like stalling at stoplights, erratic shifting, a persistent check engine light, or poor fuel economy often point to one culprit: a failing Powertrain Control Module (PCM). As the brain of your engine, when the PCM falters, the entire vehicle suffers. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded. I’ve seen it countless times in my 20+ years of diagnostics—a perfectly good engine crippled by a faulty computer.
This replacement Engine Control Module, part number 12602802, is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it has the latest GM software updates, often correcting factory bugs you didn’t even know you had. You get a component that’s ready to install right out of the box, restoring the precise fuel delivery, ignition timing, and transmission control your truck had when it was new.
A Technician’s Notebook
I remember a 2005 Suburban that came into the shop on a tow truck. The owner was at his wit’s end. He’d been to two other places for an intermittent no-start and stalling issue. No one could find the problem because it would behave perfectly in the service bay. After hooking up my scanner and monitoring live data, I noticed the 5-volt reference signal would occasionally drop out for a split second—a classic sign of an internal PCM failure. We installed a VIN-programmed module just like this one, and the truck ran flawlessly. It wasn’t a complex wiring issue; it was simply time for a new, reliable brain for the engine.
Is Your GM Truck Showing These Telltale Signs?
A failing PCM can cause a wide range of symptoms. If you’re experiencing any of the following, this module is likely the fix you need:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (PCM Processor Fault), or communication errors (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when coming to a stop or at idle.
- ✔ Rough or unstable idle.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or delayed transmission shifting.
- ✔ Failure to pass an emissions test.
DIY-Friendly Installation: Get Back on the Road Fast
Replacing the PCM on these GM trucks is one of the more straightforward electronic repairs you can do. Because we program it beforehand, you don’t need specialized scan tools. It’s truly a plug-and-play solution for the confident DIYer.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and SUVs, you’ll find it on the driver’s side, under the hood, near the battery or airbox.
- Disconnect the Connectors: Carefully unclip and remove the large wiring harness connectors from the old PCM. They have locking levers; don’t force them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held by a few bolts.
- Install the New Module: Bolt your new, pre-programmed PCM into place.
- Reconnect Everything: Firmly seat the wiring harness connectors into the new module and lock the levers. Reconnect your battery terminal.
- Perform Security Relearn: You may need to perform a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this 3 times. On the final cycle, the vehicle should start.
Verified Compatibility for Your GM Truck or SUV
This module is a direct replacement for service number 12602802 and others including 89017750, 12582605, 12589463, 89017734, and 28042802. It fits a wide range of popular GM models, including:
- Cadillac Escalade, ESV, EXT (2003-2006)
- Chevrolet Avalanche 1500 (2003-2006)
- Chevrolet Silverado 1500, 2500, 3500 (2003-2007 Classic)
- Chevrolet SSR (2003)
- Chevrolet Suburban 1500, 2500 (2003-2006)
- Chevrolet Tahoe (2003-2006)
- GMC Sierra 1500, 2500, 3500, Denali (2003-2007 Classic)
- GMC Yukon, Yukon XL 1500, XL 2500 (2003-2006)
- Hummer H2 (2003-2007)
- Isuzu Ascender (2003)
- GMC Envoy XL (2003)
- Chevrolet Trailblazer EXT (2003)
Please verify your part number or provide your VIN at checkout to ensure perfect compatibility.
How does the VIN programming work?
After you complete your purchase, you’ll provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest official GM software for your specific model, engine, and options. We flash this data onto the module before shipping it, making it ready for installation.
Do I need to do anything else after installation?
In most cases, you will need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This is a simple process that syncs the new PCM with your vehicle’s anti-theft system and can be done without special tools. Instructions are included above.
Is this a used part?
This is a high-quality, inspected, and tested recycled OEM component. Each unit is verified to be fully functional before being programmed with your vehicle’s specific software, ensuring reliability and perfect fitment.
Will this fix my specific problem?
This PCM will correct issues directly caused by a faulty module, such as internal processor faults (P0601, P0606), communication failures, and erratic engine or transmission behavior. While it solves the most common electronic problems, always ensure your vehicle’s issues have been properly diagnosed.
What is the warranty on this part?
We stand behind our work. This module comes with a comprehensive warranty that covers any defects in the module itself or the programming. Please see our warranty page for full details.