Is your 2004 Chevy Avalanche 1500 running rough, misfiring, or refusing to start? A failing Engine Control Module (ECM) can bring your dependable truck to a standstill, causing frustrating and unpredictable issues. Restore the heart of your vehicle’s operations with this professionally programmed Powertrain Control Module (PCM), ensuring your truck runs exactly as it did from the factory.
Common Symptoms of a Failing PCM & Your Direct Solution
If you’re experiencing issues like a persistent check engine light, poor fuel economy, erratic transmission shifting, or intermittent stalling, a faulty engine computer is often the culprit. This unit is the definitive fix for these problems, directly addressing common Diagnostic Trouble Codes (DTCs) such as P0601, P0602, and P0606. We are providing a genuine GM PCM, service number 12586242, that is pre-programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures perfect communication between all onboard systems, from the engine and transmission to the anti-theft system, making for a seamless restoration of performance. This is the correct 2004 Avalanche 1500 engine computer to get you back on the road.
- ✔ VIN-Programmed for Your Truck: Arrives ready for a straightforward installation, eliminating the need for expensive dealership programming or specialized tools.
- ✔ Flashed with Latest GM Updates: Your module comes loaded with the most current software available from General Motors, ensuring optimal performance, fuel efficiency, and emissions control.
- ✔ Direct-Fit Replacement: Guaranteed compatibility with service numbers 12586242, 19299226, 89017738, and others, ensuring a perfect match for your vehicle.
- ✔ Solves Drivability Problems: Directly addresses issues like rough idling, stalling, harsh shifting, and communication error codes to get your truck running smoothly and reliably again.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight from the Shop Floor
As a technician, I’ve seen countless vehicle owners waste time and money on generic or improperly programmed modules. For these 2004 GM trucks, the PCM is the central hub. It controls everything from the fuel injectors to the transmission shift points and even the security system. Simply swapping a used computer from another vehicle will result in a no-start condition due to the built-in Passlock/VATS anti-theft system. Our VIN-programming service correctly syncs this 2004 Avalanche 1500 engine computer to your specific truck, making the installation process as simple as possible and ensuring all systems function exactly as the factory intended.
Frequently Asked Questions
Do I need to do any programming after I receive it?
No. This module arrives pre-programmed to the VIN you provide. In most cases, you will only need to perform a simple security relearn procedure, which takes about 30 minutes and requires only your vehicle’s key. We include instructions for this process.
Where do I find my part number?
Your original part number is printed on the white sticker on your factory computer. This module is a direct replacement for service number 12586242 and the other numbers listed in the description.
What information do you need from me?
After you place your order, you must provide us with your 17-digit Vehicle Identification Number (VIN). This is essential for us to program the computer correctly for your specific 2004 Avalanche 1500.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original computer (like a P0601 code), this replacement will solve the problem. However, if the light is on for another reason (e.g., a bad oxygen sensor), you will still need to repair that separate issue.
What is the security relearn procedure?
It’s a simple procedure that syncs the new PCM to your truck’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this sequence three times. Full, easy-to-follow instructions are included with your order.
Is this a true plug-and-play part?
Nearly. Because it comes programmed to your VIN, it eliminates the need for dealership tools. You simply install the module, reconnect the battery, and perform the security relearn. This makes it as close to plug-and-play as possible for a 2004 Avalanche 1500 engine computer.