Restore Peak Performance to Your GM Vehicle
Is your 2004 GM truck or SUV running rough, stalling unexpectedly, or displaying a persistent Check Engine light? A failing Powertrain Control Module (PCM) is often the root cause, disrupting everything from fuel delivery to transmission shifting and leaving you with an unreliable vehicle. This pre-programmed Engine Control Module is the definitive, hassle-free solution to restore your vehicle’s factory performance and get you back on the road with confidence. We program this module to your vehicle’s specific VIN before it ships, eliminating the need for an expensive and time-consuming trip to the dealership.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing PCM is the likely culprit. This module is designed to be the direct solution for these problems:
- Erratic or no-start conditions
- Poor fuel economy
- Engine misfires or stumbling (DTCs like P0300-P0308)
- Harsh or incorrect transmission shifting
- Internal module communication errors (DTCs like P0601, P0606)
- Stalling for no apparent reason
By replacing your old unit with this professionally programmed 2004 Envoy XL PCM 12586242, you are installing a reliable, ready-to-go component that restores the critical link between your vehicle’s engine, transmission, and sensors.
Features & Benefits
- ✔ Plug & Play Installation: This unit arrives programmed to your vehicle’s specific VIN. No need for expensive trips to the dealership for flashing.
- ✔ Restored Drivability: Corrects issues like rough idling, poor acceleration, and inconsistent shifting by re-establishing factory communication and engine parameters.
- ✔ Latest GM Software: Flashed with the newest updates available from GM to ensure optimal fuel efficiency, emissions control, and performance.
- ✔ Guaranteed Compatibility: A direct replacement for service number 12586242 and many others, ensuring a perfect fit and function for a wide range of 2004 GM trucks and SUVs.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Perspective on VIN Programming
As a technician with over two decades of experience, I’ve seen countless drivability mysteries solved by a properly functioning PCM. The most critical step is the programming. An unprogrammed module is just a metal box. By programming this unit to your exact VIN before shipping, we eliminate the single biggest point of failure in this repair. We’re not just sending you a part; we’re delivering a ready-to-install solution that communicates perfectly with your vehicle’s unique systems from the moment you connect it. This is the key to a successful, long-lasting repair for your 2004 Envoy XL PCM 12586242.
Frequently Asked Questions
How do I provide my vehicle’s 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 the module until we receive and program it with your VIN.
Is this a simple plug-and-play installation?
Yes. Because we pre-program the module to your VIN, the installation process is straightforward. In most cases, you simply disconnect the battery, swap the old module with the new one, and reconnect the battery. Some vehicles may require a security relearn procedure, which is a simple process that can be done without special tools.
Will this fix my specific check engine light codes?
This PCM is the direct solution for internal module failure codes (like P0601) and often resolves a wide range of other performance-related codes. However, you should always ensure that the root cause of other codes (e.g., a faulty sensor) has been addressed first. This 2004 Envoy XL PCM 12586242 will not fix a problem caused by another bad part on the vehicle.
What happens if I don’t provide my VIN?
We cannot ship the part without your VIN. The programming is essential for the module to function in your vehicle. An unprogrammed module will not start or run the engine correctly. Your order will be held until we receive the necessary information.
Does this PCM require any additional programming after installation?
No. The unit is shipped fully programmed and ready for installation. The only potential step is a simple security relearn procedure (also known as a CASE relearn) which your vehicle may perform automatically or with a series of key cycles.
How can I confirm this is the right part for my vehicle?
Please check the service number on your current computer. This unit replaces service numbers 12586242, 19299226, 89017738, and many others listed in the fitment data. Matching one of these numbers ensures compatibility.