Restore Peak Performance to Your 2004 GM Vehicle
Is your 2004 Chevrolet SSR, GMC Sierra, or another GM truck/SUV experiencing perplexing issues like stalling, rough idling, poor fuel economy, or an illuminated Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle’s engine and transmission. Don’t let a faulty computer keep you off the road. This direct-fit replacement PCM, part number 12586242, is the reliable solution to restore your vehicle’s original performance and drivability.
This isn’t just a part in a box. We provide a comprehensive service by pre-programming this module specifically for your vehicle using your VIN. This critical step ensures that the PCM has the latest GM software updates and communicates flawlessly with all other systems in your truck or SUV. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money. Simply provide your VIN at checkout, and we handle the rest, shipping you a unit that’s ready for installation.
From the Diagnostic Bay
We had a 2004 GMC Envoy XL come into the shop with a complaint that was driving the owner crazy. The vehicle would randomly lose power, the transmission would shift hard, and the dash lights would flicker intermittently. There were no consistent trouble codes, just a collection of communication errors that would come and go. After hours of chasing wires and checking grounds, we focused on the PCM. On the outside, it looked fine. But we knew from experience that internal circuit board failures can cause these ghost-like problems. We installed one of our VIN-programmed 12586242 modules, performed the security relearn, and the Envoy ran like it just rolled off the assembly line. All the strange electrical gremlins were gone. It’s a powerful reminder that the PCM is the true heart of the vehicle’s operating system.
Is Your 2004 SSR PCM Failing?
A failing powertrain module can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM could be the culprit. This unit is the definitive solution for restoring the core functionality of your vehicle’s engine management system.
- ✔ Check Engine Light: Your check engine light is on, and you may have codes related to sensors, emissions, or module communication.
- ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an unusually long time to fire up.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough running.
- ✔ Reduced Fuel Economy: The PCM controls the air-fuel mixture, and a faulty one can cause your vehicle to consume more gasoline than usual.
- ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in a gear can be caused by poor communication between the PCM and the transmission.
- ✔ Intermittent Stalling: The engine may shut off unexpectedly while driving or when coming to a stop.
Plug-and-Play Solution with Professional Programming
The biggest hurdle in replacing a modern vehicle computer is the programming. This module removes that obstacle. It is compatible with a wide range of popular 2004 GM models, including the Chevrolet Silverado, Suburban, Tahoe, and SSR; the GMC Sierra and Yukon; the Cadillac Escalade; and the Hummer H2. By matching service number 12586242 or one of the interchangeable numbers like YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, or YHTN, you can be confident in a perfect fit. We flash the unit with your vehicle’s specific VIN, ensuring all factory options and parameters are correctly loaded. This makes installation straightforward for a DIY mechanic or a professional technician.
Upon installation, you may need to perform a simple security relearn procedure (often called a CASE relearn) to sync the new PCM with your vehicle’s anti-theft system and crankshaft position sensor. This procedure is well-documented and can typically be done without special tools. Get your truck or SUV running right again with a reliable, professionally programmed PCM.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN when you place your order, and we will flash the module with the latest GM software specific to your vehicle.
Where is the PCM located on my 2004 GM vehicle?
The location varies slightly by model. On many trucks and SUVs like the Sierra, Silverado, and Yukon, it is located on the driver’s side front of the engine bay, under the battery tray. On models like the Trailblazer, Envoy, and SSR, it is typically found in the engine bay next to the air filter box.
What is a CASE relearn and will I need to do it?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. This is often required after a PCM replacement to prevent a P1336 trouble code. Many high-end scan tools can perform this procedure, or it can be done at most repair shops.
How do I confirm this is the right part for my vehicle?
The best way is to check the part number on your existing module. This PCM replaces part number 12586242 and several other service numbers listed in the description. Matching one of these numbers ensures compatibility. You can also use the detailed fitment list provided on this page.
Is this a simple plug-and-play installation?
Yes, for the most part. Once we program the module with your VIN, the physical installation involves disconnecting the battery, unplugging the electrical connectors from the old PCM, removing it, and installing the new one. After that, you may need to perform the security/CASE relearn procedure to finalize the process.