Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 Chevrolet SSR, Silverado, Tahoe, or another compatible GM vehicle suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM) is often the culprit behind poor performance, erratic behavior, and frustrating no-start conditions. This replacement PCM, service number 12586242, is the definitive solution to get your vehicle running reliably again. It serves as the central command for your engine and transmission, and when it fails, the symptoms can be widespread and difficult to diagnose. We take the guesswork out of the repair by providing a module that is professionally programmed with the latest GM software updates, specifically matched to your vehicle’s VIN.
From the Diagnostic Bay
We had a 2004 GMC Envoy XL come into the shop with a list of complaints that had other mechanics stumped. The owner reported random stalling at stoplights, harsh transmission shifts, and a check engine light that would come and go. We checked all the usual suspects—sensors, wiring, fuel pressure—and everything seemed fine. On a hunch, we monitored the data stream from the PCM and noticed intermittent dropouts and illogical readings. The internal processor was failing. After installing a VIN-programmed PCM just like this one, all the issues vanished. The Envoy drove like it just rolled off the showroom floor. It’s a reminder that the PCM is the brain, and even a small glitch can cause chaos.
Common Symptoms of a Failing 2004 SSR PCM
If you’re experiencing any of the following issues, a failing engine computer could be to blame. Replacing it with this pre-programmed unit can resolve these problems and restore your vehicle’s factory operation.
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or shutting off while driving
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Reduced engine power and sluggish acceleration
- ✔ Communication errors with diagnostic scan tools
- ✔ False sensor codes being stored in memory
Plug-and-Play Installation, Programmed for You
Forget expensive dealership visits and complex programming tools. This PCM is delivered to you ready for installation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the correct software for your specific make, model, and options. This ensures seamless integration and proper function of all vehicle systems. This unit is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN, offering broad compatibility across a wide range of 2004 GM vehicles including the Chevrolet SSR, Silverado, Suburban, Tahoe, Avalanche; GMC Sierra, Yukon; Cadillac Escalade; Hummer H2; Buick Rainier; and Isuzu Ascender.
Upon installation, your vehicle may require a simple security relearn procedure, which can typically be done without special tools and takes only a few minutes. This ensures the new PCM communicates correctly with your vehicle’s anti-theft system.
Frequently Asked Questions
What does the Powertrain Control Module (PCM) do?
The PCM is the main computer that controls your vehicle’s engine and transmission. It takes data from dozens of sensors to manage fuel injection, ignition timing, emissions systems, and automatic transmission shift points to ensure optimal performance, fuel efficiency, and low emissions.
Is this PCM a simple plug-and-play installation?
Yes, for the most part. Because we program the module to your vehicle’s specific VIN before shipping, it eliminates the need for you to have it programmed. In most cases, you will only need to perform a standard security relearn procedure after installation, which syncs the new computer with your keys.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your vehicle’s specific build, including engine size, transmission type, and other factory options. Programming the PCM with your VIN ensures it has the exact software and calibrations from GM for your vehicle to run correctly.
How do I find my original part number to confirm a match?
Your original part number is printed on a white or silver sticker on the PCM itself. For most trucks like the Silverado and Sierra, it’s located under the hood on the driver’s side, near the battery. For SUVs like the Envoy and Trailblazer, it’s typically next to the air filter box. Match the service number (e.g., 12586242 or YHTN) to the list in our description.
Will this computer fix my transmission shifting problems?
If the shifting problems are caused by a faulty PCM, then yes, this will resolve them. The PCM controls the transmission’s electronic solenoids and shift logic. However, harsh shifting can also be caused by mechanical issues within the transmission. It’s always best to have a proper diagnosis, but if you’re also experiencing engine-related symptoms, the PCM is a very likely cause.