End the Guesswork and Get Your Truck Running Right
Is your 2004 GM truck or SUV giving you headaches? Unexplained stalling, a persistent Check Engine Light, or rough, unpredictable performance can turn a dependable workhorse into a source of constant worry. These frustrating issues often point to a failing Engine Control Module (ECM), the brain of your vehicle. Don’t let a faulty computer keep you off the road. This replacement ECM, part number 12586242, is the definitive solution to restore your vehicle’s performance and your peace of mind.
We take the complexity out of the repair. Simply provide your vehicle’s VIN during checkout, and our experts will program this module with the latest, most stable software updates directly from GM. It arrives at your door ready for a straightforward installation, eliminating the need for expensive dealership programming or specialized tools. Regain the smooth, reliable power you depend on every day.
Symptoms of a Failing ECM and the Benefits of Replacement
- ✔ Eliminate Stalling and No-Start Conditions: A new, correctly programmed ECM restores stable communication between sensors, ensuring reliable starting and consistent engine operation.
- ✔ Clear Persistent Check Engine Lights: Finally resolve stubborn diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault) that point directly to a computer failure.
- ✔ Restore Smooth Performance: Corrects issues like rough idling, poor acceleration, and erratic shifting by re-establishing precise control over fuel delivery and ignition timing.
- ✔ Improve Fuel Economy: A properly functioning 2004 GM ECM ensures your engine runs at peak efficiency, which can lead to noticeable improvements in your miles per gallon.
- ✔ Plug-and-Play Installation: Because we program it to your VIN, this module is ready to install right out of the box, saving you time and money.
Guided Installation to Restore Your Ride
- Safety First: Begin by disconnecting the negative terminal of your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On most compatible vehicles, you’ll find the ECM either under the hood on the driver’s side (often next to the airbox or under the battery tray) inside a black plastic housing.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and gently pull them straight out from the module. There are typically multiple color-coded connectors.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you’ll need it for the new unit.
- Install the New 2004 GM ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect and Secure: Firmly plug the wiring harness connectors back into the corresponding ports on the new module. You should hear or feel a click as they lock into place.
- Power Up: Reconnect the negative battery terminal. Your vehicle is now ready to start with its fully updated and correctly configured brain.
Tailored Fit for Your GM Vehicle
This module is a direct-fit replacement for a wide range of 2004 GM trucks and SUVs. It is compatible with service numbers 12586242, 19299226, 89017738 and service IDs including YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify your part number or contact us with your VIN to ensure perfect compatibility for models such as:
- Cadillac Escalade, ESV, EXT
- Chevrolet Avalanche, Silverado, Suburban, Tahoe, SSR, Trailblazer EXT
- GMC Envoy XL, Envoy XUV, Sierra, Sierra Denali, Yukon, Yukon XL
- Hummer H2
- Buick Rainier
- Isuzu Ascender
Do I need to do any programming myself?
No, you don’t. The main benefit of our service is that we program the module to your vehicle’s specific VIN before we ship it. It arrives ready to install, with no need for a trip to the dealership or a specialized scan tool.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
What is a VIN and where can I find it?
The VIN is a unique 17-digit code for your vehicle. You can typically find it on a small plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my specific problem?
This ECM is designed to correct issues directly caused by a failing computer, such as internal processor faults (e.g., code P0606) and other common symptoms like stalling or no-start conditions. While it is a very common failure point, we always recommend a proper diagnosis to confirm the ECM is the root cause of your vehicle’s issues.
Is any other procedure required after installation?
In some GM vehicles, a security relearn procedure (often called a CASE relearn or Passlock relearn) may be necessary after installation. This is a simple procedure that can typically be done without special tools and involves a sequence of key turns. Instructions are widely available online for your specific model.