Restore Your Truck’s Performance and Reliability
Is your 2004 Chevrolet Avalanche, Sierra, or other GM truck plagued by a persistent check engine light, erratic performance, or a frustrating no-start condition? A failing Engine Control Module (ECM) is often the culprit, disrupting communication between critical systems and leaving you stranded. This direct-replacement Powertrain Control Module (PCM), service number 12586242, is the definitive solution to get your vehicle back on the road with the dependability you expect. Before we ship, we flash the unit with the latest official GM software updates, programmed specifically to your vehicle’s VIN. This ensures seamless integration and restores your engine’s original performance and efficiency.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty ECM is the likely cause. This pre-programmed module is designed to resolve them:
- Check Engine Light (CEL) with communication-related DTCs (e.g., P0601, P0606)
- Engine stalling, stumbling, or misfiring
- Poor fuel economy
- Harsh or incorrect automatic transmission shifting
- Complete no-start or intermittent starting problems
- Failure to pass emissions testing
Stop chasing symptoms and address the root cause. Installing this VIN-programmed 2004 Avalanche 1500 ECM 12586242 is the most effective way to restore proper engine management and clear those stubborn codes for good.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the module with your truck’s specific VIN, ensuring it works right out of the box after the security relearn procedure.
- ✔ Restores Peak Performance: Loaded with the newest GM software updates to optimize fuel delivery, ignition timing, and transmission control.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for the original unit, guaranteeing a straightforward installation with no modifications needed.
- ✔ Solves Drivability Issues: Eliminates common problems like poor idling, hesitation, and stalling caused by a failing computer.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Power of Correct Software
As a technician, I’ve seen countless hours and dollars wasted trying to diagnose drivability issues on these GMT800 platform trucks. Mechanics might replace sensors and spark plugs, only to have the problem return. Often, the issue lies in outdated or corrupted software within the original ECM. By providing a module with fresh, VIN-matched GM software, we’re not just replacing a part; we’re providing a foundational fix that allows all other engine components to function exactly as the manufacturer intended. It’s the difference between a temporary patch and a lasting repair.
Guaranteed Fitment
This module is a confirmed replacement for units with service numbers 12586242, 19299226, or 89017738 and fits a wide range of 2004 GM trucks and SUVs. Please verify your original part number to ensure compatibility. This 2004 Avalanche 1500 ECM 12586242 is the correct part for dozens of models, including the Silverado, Suburban, Tahoe, Yukon, Escalade, Hummer H2, and more. After purchase, simply provide us with your VIN, and we’ll handle the programming.
Frequently Asked Questions
Do I need to send you my old computer?
No, there is no core charge or need to send your original module to us. This is a direct purchase.
What information do you need from me?
After you complete your purchase, we will need your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the ECM with the correct software and calibration for your specific truck or SUV.
Is this ECM difficult to install?
The physical installation is typically straightforward. On most of these GM trucks, the ECM is located under the battery on the driver’s side. After swapping the part, you will need to perform a security relearn procedure (often called CASE or Passlock/Passkey relearn). This procedure syncs the new ECM to your vehicle’s anti-theft system and can usually be done without special tools. Instructions are widely available online or in service manuals.
Will this fix my specific problem?
This ECM is the solution for a wide range of issues directly caused by a failing engine computer, including specific diagnostic trouble codes and common performance symptoms. While it resolves the vast majority of ECM-related faults, it’s always recommended to have a proper diagnosis performed to rule out other potential issues like wiring or sensor failures.
What does ‘VIN-Programmed’ mean?
It means we load the module with the specific operational software and calibrations that your vehicle had when it left the factory, plus any subsequent updates from GM. This ensures all the systems in your vehicle—from the engine and transmission to the instrument cluster—communicate correctly with the new computer.
Which service numbers does this part replace?
This computer is a direct replacement for modules with the following service numbers: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.
