Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Isuzu Ascender, Chevy Silverado, or GMC Sierra running rough, shifting poorly, or refusing to start? A failing Powertrain Control Module (PCM) can be the source of countless frustrating and seemingly random issues. This replacement engine computer, service number 12586242, is the definitive solution to get your vehicle back on the road with the reliability you depend on. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation.
Common Symptoms & Your Direct Solution
If you’re experiencing any of the following, a faulty PCM is the likely culprit:
- Persistent Check Engine Light (CEL)
- Engine stalling, sputtering, or misfiring
- Harsh or erratic automatic transmission shifting
- Poor fuel economy
- No-start condition where the engine cranks but won’t fire
- Communication error codes (such as U0100)
This module is the heart and brain of your vehicle’s engine and transmission management. By replacing your old, failing unit with this professionally programmed computer, you are directly addressing the root cause of these problems and restoring your vehicleโs factory-spec operation.
Features & Tangible Benefits
- โ Plug & Play Installation: This unit arrives pre-programmed to your specific VIN. No expensive trips to the dealer for flashing are required.
- โ Updated GM Software: We flash each module with the latest, most stable software updates from General Motors, often improving performance and efficiency beyond the original calibration.
- โ Guaranteed Compatibility: This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for a wide range of GM trucks and SUVs.
- โ Cost-Effective Repair: Avoid the high costs and scheduling hassles of a dealership service department with a solution you can install yourself.
- โ This unit is backed by our one-year replacement warranty.
An Expert’s Note: Many people consider buying a used computer from a salvage yard, but this is a critical mistake. A PCM from another vehicle is locked to that vehicle’s VIN and anti-theft system (PassLock/VATS). It simply will not start your engine without specialized programming. Our service eliminates that barrier. By providing your VIN, we ensure the replacement 2004 Isuzu Ascender PCM is correctly configured for all your vehicle’s options and security protocols right out of the box, saving you time, money, and immense frustration.
Will This Fit My Vehicle?
This Electronic Control Module is compatible with a wide variety of 2004 General Motors trucks and SUVs equipped with 5.3L and 6.0L gasoline engines. It is a direct replacement for units with service number 12586242 or any of the following hardware IDs: YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN. Key compatible models include:
- Buick Rainier
- Cadillac Escalade (ESV, EXT)
- Chevrolet Avalanche, Silverado, SSR, Suburban, Tahoe, Trailblazer EXT
- GMC Envoy (XL, XUV), Sierra, Sierra Denali, Yukon, Yukon XL
- Hummer H2
- Isuzu Ascender
Please verify the service number on your current module to ensure an exact match.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module is sold as a complete plug-and-play solution. We handle all the programming to your vehicle’s VIN before it ships. In most cases, no additional security relearn procedure is required.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot ship your part until we receive the VIN.
Is this the correct part for my truck?
This module fits a wide range of 2004 GM vehicles. The best way to confirm compatibility is to match the service number (e.g., 12586242) or the 4-letter broadcast code (e.g., YHTN) from your original computer to the numbers listed in this description. This ensures you get the correct 2004 Isuzu Ascender PCM for your application.
What if I install it and still have a problem?
Our modules are rigorously tested. If you encounter an issue, please contact us immediately. The unit is backed by a one-year replacement warranty for your peace of mind. We are here to help ensure your repair is successful.
Will this fix my specific Check Engine Light code?
This PCM is designed to resolve all issues originating from a faulty computer, including many diagnostic trouble codes (DTCs). However, a check engine light can be triggered by other failing components (sensors, wiring, etc.). It’s always best to have your vehicle properly diagnosed to confirm the PCM is the point of failure before ordering.