Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Chevrolet Suburban 1500, or another compatible GM vehicle, suffering from perplexing engine issues? Unexplained stalling, a persistent check engine light, poor fuel economy, or erratic transmission behavior can often be traced back to a failing Engine Control Module (ECM). As the central computer of your vehicle, the ECM is responsible for managing everything from fuel injection and spark timing to transmission shift points and emissions controls. When it falters, the entire vehicle’s performance and reliability are compromised. This replacement ECM, part number 12586242, is the definitive solution to restore your vehicle’s factory operation and driving confidence.
From the Diagnostic Bay
We had a 2004 Silverado 2500 with the 6.0L towed in with a classic “crank, no-start” condition. The owner had already replaced the fuel pump and crank sensor based on advice from a forum. Our initial scan showed no communication with the ECM. After verifying power and ground at the module connectors were good, we knew the ECM itself was the culprit. A quick check of the original module confirmed part number 12586242. We installed one of our VIN-programmed units, performed the quick security relearn, and the truck fired up on the first try. It’s a textbook example of how a faulty module can mimic other component failures, making accurate diagnosis key.
Is Your 2004 Suburban 1500 ECM Failing?
A failing engine computer can manifest in numerous ways, often mimicking other sensor or component failures. If you’re experiencing any of the following, a faulty ECM could be the root cause. This module is the correct solution for these common issues.
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Communication errors when using a diagnostic scan tool.
- ✔ Failure to pass state emissions testing.
The Plug-and-Play Solution: VIN Programmed for You
Don’t waste time and money at a dealership. This ECM comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash the module with the latest GM-certified software updates before it ships, ensuring it communicates perfectly with your vehicle’s existing systems right out of the box. This critical programming step matches the computer to your engine, transmission, and factory options, making installation straightforward. Once installed, a simple security relearn procedure (often called a CASE relearn) is typically all that’s needed to sync the new module with your vehicle’s anti-theft system. This process requires no special tools and can be done in your own driveway.
Guaranteed Compatibility
This ECM is a direct replacement for service part number 12586242 and is also a compatible replacement for several other service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits a wide range of 2004 GM models, including the Chevrolet Suburban 1500, Silverado, Tahoe, Avalanche, GMC Sierra, Yukon, Cadillac Escalade, Hummer H2, and more. Please verify your original part number or consult the detailed fitment list to ensure this is the correct part for your specific application.
Frequently Asked Questions
Do I need to take this ECM to a dealer for programming?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct factory software for your specific vehicle. It will arrive ready for installation.
What is a security or CASE relearn, and is it difficult?
A security relearn (or Crankshaft Variation Relearn) is a simple procedure that syncs the new ECM to your vehicle’s anti-theft system and crankshaft position sensor. It typically involves a series of key turns and waiting periods and does not require any special tools. We include instructions to guide you through this final step.
Where is the ECM located on my 2004 Suburban 1500?
On most GM trucks and full-size SUVs from this year, including the Suburban, Tahoe, Silverado, and Sierra, the ECM is located in the engine bay on the driver’s side, under the battery and battery tray.
How can I be sure this is the correct part number for my truck?
The best way to confirm is to check the service number on the sticker of your original ECM. This part, 12586242, replaces many different service numbers. If your number is listed in our description, this module will work for you.
What happens if I forget to provide my VIN?
Programming is essential for the module to function in your vehicle. We cannot ship your order until we receive your VIN. We will contact you via email if the VIN is not provided with the order to prevent delays.