Restore Peak Performance to Your Vehicle
Is your 2004 Chevrolet SSR, GMC Sierra, or another compatible GM vehicle suffering from perplexing issues like a persistent check engine light, erratic engine behavior, poor fuel economy, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that governs your engine’s performance. This direct-fit replacement PCM, service number 12586242, is the definitive solution to restore your vehicle’s factory performance and reliability.
The PCM is the brain of your vehicle’s engine management system. It constantly analyzes data from sensors throughout the engine and drivetrain to make real-time adjustments to fuel mixture, ignition timing, transmission shift points, and emissions controls. When it fails, the entire system can be thrown into disarray, leading to frustrating and potentially damaging running conditions. Internal component failure, often caused by heat, vibration, and age, can corrupt the module’s ability to process information correctly.
From the Diagnostic Bay
We had a 2004 GMC Envoy XL with the 5.3L V8 come into the shop with a complaint of intermittent stalling and a check engine light for a random misfire. The owner had already replaced the spark plugs, wires, and even a couple of ignition coils with no success. After hooking up our professional scan tool, we noticed the data stream for the crankshaft position sensor was dropping out, but testing the sensor and its wiring showed they were perfectly fine. The issue was traced back to a faulty driver circuit inside the original PCM. A faulty computer was mimicking a sensor failure, costing the owner time and money on unnecessary parts. Installing a correctly programmed PCM like this one solved the problem instantly.
Common Symptoms of a Failing 2004 SSR PCM
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indication that your PCM may need replacement. Verifying the diagnosis is key, but these symptoms point directly to a faulty module.
- ✔ Check Engine Light: The light is illuminated, and you may have stored diagnostic trouble codes (DTCs) related to sensor circuits, communication errors (U-codes), or processor faults.
- ✔ No-Start or Hard-Start: The engine cranks but refuses to start, or takes an unusually long time to fire up, either hot or cold.
- ✔ Poor Engine Performance: You may notice a significant loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the fuel delivery, leading to a noticeable drop in MPG.
- ✔ Erratic Shifting: The module also influences automatic transmission behavior, and a fault can cause harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
Plug-and-Play Solution with VIN Programming
The biggest challenge when replacing a modern vehicle computer is programming. This module eliminates that hurdle. We flash the unit with the latest GM-certified software updates specifically for your vehicle using the VIN you provide. This ensures that the PCM has the correct calibration for your engine, transmission, and emissions equipment. When you receive the part, it’s ready for installation, saving you a costly trip to the dealership for programming services. Simply provide your VIN after purchase, and we’ll handle the rest.
This module is a direct replacement for service number 12586242 and is also compatible with a wide range of other numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. It fits a vast array of 2004 GM trucks and SUVs, such as the Chevrolet Silverado, Suburban, Tahoe, Trailblazer EXT; GMC Sierra, Yukon, Envoy; Cadillac Escalade; and more. Please verify your service number or consult the fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We program the module to your vehicle’s specific VIN before shipping it to you. This makes the installation process much simpler and avoids the need for expensive specialty tools or a trip to the dealer.
Where is the PCM located on my vehicle?
For most vehicles on the fitment list, such as the SSR, Envoy, Rainier, and Trailblazer, the PCM is located in the engine bay, next to the air filter box. On trucks like the Silverado, Sierra, and Suburban, it is typically found on the driver’s side front fender, under the battery tray.
Will I need to perform any other procedures after installation?
In some cases, a security relearn procedure (also known as an anti-theft relearn) may be necessary for the vehicle to start. This is a simple procedure that typically involves cycling the ignition key and does not require special tools. A Crankshaft Variation Relearn (CASE Relearn) might also be needed to clear certain trouble codes, which can be done with many high-level scan tools.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a guaranteed fix for my vehicle’s problems?
This PCM will fix any issues directly caused by a faulty computer. However, it is crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems caused by faulty sensors, bad wiring, or mechanical issues. Always confirm the diagnosis before ordering.