Is Your Truck Running Rough? Get the Definitive Solution.
If you’re dealing with a persistent check engine light, erratic shifting, stalling, or poor fuel economy in your GM truck or SUV, a failing Powertrain Control Module (PCM) is often the hidden culprit. These symptoms can be frustrating and difficult to diagnose, but our pre-programmed PCM provides a direct and reliable solution. We take the guesswork out of the repair, delivering a unit that is flashed specifically for your vehicle, restoring the performance and dependability you rely on every day.
Common Symptoms of a Failing GM PCM & Your Solution
A faulty PCM can cause a wide range of issues that mimic other component failures. If you’re experiencing any of the following, this module is your answer:
- Unexplained Check Engine Light (with codes like P0601, P0606)
- Engine Stalling or Misfiring
- Harsh or Failed Transmission Shifting
- Poor Fuel Mileage
- Vehicle Won’t Start or Has Trouble Starting
- Communication Errors with Scanners
Replacing your computer with our professionally programmed 2003-2006 Avalanche 1500 PCM resolves these core issues by restoring the brain of your vehicle’s operations. We use your Vehicle Identification Number (VIN) to load the correct, updated software from GM, ensuring your engine and transmission function exactly as the manufacturer intended.
Features & Benefits
- ✔ Plug & Play Ready: This module arrives programmed to your vehicle’s specific VIN. This crucial step eliminates the need for expensive dealership programming or specialized tools, saving you significant time and money on installation.
- ✔ Optimized Factory Performance: We flash your PCM with the latest software updates available from GM. This ensures proper fuel efficiency, smooth transmission shifting, and correct emissions control for your specific model.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for a wide range of GM trucks and SUVs, including service numbers 89017750, 12582605, 12589463, 12602802, and more. It is the correct solution for your 2003-2006 Avalanche 1500 PCM and many other models.
- ✔ Reliable & Inspected: Each module is thoroughly inspected to ensure it meets strict quality and performance standards, giving you a dependable part that provides a long-lasting fix.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
Expert Insight from a 20-Year Technician
“After decades working on these GM trucks, I’ve seen countless owners and shops waste money chasing ghosts—replacing sensors, coils, and fuel pumps when the PCM was the real problem. A failing computer can send out false signals, making diagnosis a nightmare. Installing a correctly programmed 2003-2006 Avalanche 1500 PCM isn’t just swapping a part; it’s like giving your truck’s central nervous system a clean bill of health. It’s the right way to get your dependable workhorse back on the road for good.”
Frequently Asked Questions
Do I need to do anything after I install this PCM?
In most cases, you will need to perform a security relearn procedure, which can typically be done without special tools and takes about 30 minutes. Some vehicles may also require a Crankshaft Variation Relearn (CASE relearn), which requires a capable scan tool. Instructions for the security relearn are readily available online for your specific model.
How do I provide my vehicle’s VIN?
After you complete your purchase, simply reply to your order confirmation email with your 17-digit VIN, or add it to the ‘notes’ section during checkout. We cannot program and ship your module without it.
Is this a brand new part?
This is a high-quality, rigorously inspected component that has been professionally programmed with the latest vehicle-specific software to ensure reliable operation and performance.
What if my original part number isn’t on the list?
The provided list covers many common service numbers. If you don’t see yours, please contact us with your VIN and the number from your original module. We will be happy to verify compatibility for you.
Will this fix my check engine light?
If your check engine light and performance issues are caused by an internal failure of the PCM, this part is the correct solution. However, it’s essential to ensure the vehicle has been properly diagnosed, as this module will not fix issues caused by faulty sensors or other mechanical problems.
What is the warranty on this part?
This unit is backed by our one-year replacement warranty.