Restore Peak Performance to Your GM Truck or SUV
Is your 2004 Cadillac Escalade, Sierra, Yukon, or other compatible GM vehicle suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM) is often the culprit behind problems like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition. This module, part number 12586242, is the central computer for your engine and transmission, and its proper function is critical. We offer a reliable, direct-fit solution: a thoroughly tested OEM engine computer, professionally programmed with the latest GM software updates specifically for your vehicle’s VIN.
The Brain of Your Vehicle’s Operation
The PCM is responsible for managing countless parameters to ensure your engine runs efficiently and powerfully. It controls fuel injection timing, spark advance, transmission shift points, and emissions systems. When internal components fail, it can lead to a cascade of issues that are often misdiagnosed as faulty sensors or other parts. Replacing a defective unit with a correctly programmed module is the definitive way to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 2004 Sierra 1500 in the shop that was driving the owner crazy. It had a random misfire code that would pop up, a slightly rough idle, and the transmission would occasionally shift hard from first to second. The owner had already replaced the spark plugs, wires, and two different sensors with no luck. After hooking up our professional scan tool, we noticed that the fuel trim data was behaving erratically. This pointed us away from the individual components and towards the central controller. We installed a VIN-programmed PCM, performed the security relearn, and the truck immediately ran like new. All the ghost issues were gone. It’s a classic case of symptoms pointing in multiple directions, but the root cause being the main computer.
Solving Your 2004 Escalade PCM Problems
A failing 2004 Escalade PCM can manifest in various ways. If you’re experiencing any of the symptoms below, a faulty engine computer could be the cause. This pre-programmed module is designed to be a straightforward solution to get your vehicle back on the road quickly and reliably.
Common Symptoms of a Failing PCM:
- ✔ Check Engine Light is on with various trouble codes (DTCs)
- ✔ Engine stalling or idling rough
- ✔ Noticeable decrease in fuel mileage
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine cranks but fails to start
- ✔ Communication errors with diagnostic scan tools
- ✔ Failure to pass state emissions testing
Plug-and-Play Solution with Simple Setup
Our goal is to make your repair as simple as possible. When you order, you provide us with your vehicle’s VIN. Our technicians then flash the module with the correct, updated software direct from GM for your specific vehicle configuration. This ensures compatibility and optimal performance. For most vehicles, the installation is straightforward, though some models may require a simple, unassisted security relearn procedure (often called CASE relearn or Passlock relearn) which can be done without special tools. This ensures the new PCM communicates correctly with your vehicle’s anti-theft system. We provide clear instructions to guide you through this final step.
This module is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Verify your original part number to ensure a perfect match for your 2004 Escalade PCM or other compatible GM vehicle.
Frequently Asked Questions
What information do you need to program the PCM?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the module. You can provide this during checkout or reply to your order confirmation email. The VIN ensures we load the precise software for your engine, transmission, and options.
Will I need to do anything after installing this module?
In many cases, you will need to perform a security relearn procedure. This syncs the new PCM with your vehicle’s anti-theft system. This procedure typically involves a series of key turns and waiting periods and does not require a mechanic or special tools. We include instructions for the most common procedures.
Is this a brand new part?
This is a genuine, original equipment (OEM) part that has been meticulously inspected, tested, and verified to meet or exceed factory specifications. It is not a new part, but it is guaranteed to function correctly.
How can I be sure my PCM is the actual problem?
While the symptoms listed are very common for PCM failure, it’s always best to have a proper diagnosis performed by a qualified technician. Common issues like bad grounds, faulty wiring, or failed sensors can sometimes mimic PCM failure. However, if other components have been ruled out, the PCM is the likely cause.
Will this computer fit other GM vehicles besides the Escalade?
Yes. This PCM, service number 12586242, fits a wide range of 2004 GM trucks and SUVs including the Silverado, Sierra, Tahoe, Yukon, Suburban, Hummer H2, and more. Please check the detailed fitment list on this page and match your original part number to confirm compatibility.