Restore Your Truck’s Core Performance and Reliability
Is your Chevrolet, GMC, Cadillac, or Hummer experiencing frustrating issues like a persistent check engine light, erratic shifting, poor fuel mileage, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. Don’t let a faulty module keep you off the road. This replacement PCM is the definitive, hassle-free solution to restore your vehicle’s factory performance and operational integrity.
We take the guesswork and dealer expense out of the equation. Each module is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures 100% compatibility with your truck’s systems and includes the very latest software updates from General Motors. You get a component that is ready for installation right out of the box, eliminating the need for expensive dealership programming or specialized scan tools.
Is Your GM Truck Showing These Signs?
A failing PCM can cause a wide range of problems. Over my 20+ years in diagnostics, these are the most common symptoms I’ve traced back to a faulty engine computer on these GM platforms. If you’re experiencing any of these, a new module is the likely solution.
- ✔ Check Engine Light is on with communication error codes (like U0100) or internal module failure codes (P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or delayed automatic transmission shifts.
- ✔ Rough or unstable engine idle.
- ✔ Your vehicle failed an emissions test.
- ✔ Intermittent stalling for no apparent reason.
A Technician’s Notebook: The Intermittent No-Start Nightmare
A customer brought in his ’05 Silverado 2500 with a 6.0L, a truck he depended on for work. The problem was maddening: sometimes it would start perfectly, other times it would just crank and crank. He’d already replaced the battery and checked the fuel pump. When I connected my scan tool, I couldn’t communicate with the PCM—a huge red flag. After verifying the PCM was getting good power and ground, it was clear the module itself was failing internally. We installed one of these VIN-programmed PCMs, performed the quick security relearn, and the truck fired up instantly. The problem never returned, saving the customer from losing more work days.
A Straightforward Guide to Installation
Installing your new 2003-2006 Avalanche 1500 PCM is a job most DIYers can handle in their own driveway. After installation, a simple security relearn procedure is required, which does not need any special tools. This procedure pairs the new PCM to your vehicle’s anti-theft system.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay on the driver’s side, under or next to the battery and housed within a plastic bracket.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. The levers make this straightforward.
- Swap the Module: Remove the old PCM from its mounting bracket and install the new one in its place.
- Reconnect Everything: Securely plug the wiring harnesses into the new PCM until they click. Reconnect the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position (don’t start the engine). The security light should be on or flashing. Leave the key on for 10-12 minutes, or until the light turns off. Turn the key off for 10 seconds. Repeat this cycle two more times for a total of three cycles. The vehicle should now start and run.
Will This Fit My Truck or SUV?
This PCM, part number 28042802, is a direct replacement for a wide range of GM vehicles and is compatible with multiple service numbers including 89017750, 12582605, 12589463, 12602802, and 89017734. Please verify your model and year from the list below to ensure proper fitment.
GMC: Sierra 1500/2500/3500 (03-07 Classic), Sierra Denali (03-07 Classic), Yukon & Yukon XL (03-06), Envoy XL (03)
Cadillac: Escalade, ESV, EXT (03-06)
Hummer: H2 (03-07)
Isuzu: Ascender (03)
Note: Specific engine sizes and options apply. For 2004 models, matching ID 12602802 is often required.
Frequently Asked Questions
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming involves loading your vehicle’s unique 17-digit VIN into the PCM. This ensures the computer has the correct software and calibrations for your specific engine, transmission, and options package. It is essential for proper function and avoids compatibility issues.
How do I provide my VIN after purchase?
After you complete your purchase, simply send us a message with your vehicle’s VIN. We will program the module before shipping it out to you. Your order cannot be processed without the VIN.
Is this a plug-and-play part?
Yes, for the most part. The module arrives programmed and ready to be physically installed. The only additional step required is the simple, tool-free security relearn procedure detailed in our installation guide, which syncs the new PCM with your truck.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606) or related communication errors, then yes, this part is the correct fix. It’s always best to have the codes read to confirm the diagnosis before ordering.
Does this part require any other programming at a dealership?
No. Our VIN programming service handles everything. You will not need to take your vehicle to a dealer or mechanic for additional programming, saving you significant time and money.