Is your 2004 Cadillac Escalade EXT suffering from perplexing issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission performance. A faulty PCM can disrupt everything from fuel delivery and ignition timing to transmission shift points, making your truck unreliable and frustrating to drive. Don’t let a bad computer keep your vehicle off the road. This is the direct, reliable solution you need.
This listing is for a genuine GM engine computer, service number 12586242, which is the heart of your vehicle’s operational systems. We take the guesswork and hassle out of the replacement process. Before we ship the part, our technicians will program it with the latest GM factory software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that when it arrives, it’s a true plug-and-play component. There’s no need for expensive trips to the dealership for programming—just install it, connect the battery, and you’re ready to go.
From the Diagnostic Bay
We had a 2004 Sierra 1500 in the shop that was driving the owner crazy. It would randomly stall at stoplights and had a check engine light with a dozen unrelated codes—oxygen sensors, transmission solenoids, you name it. The owner had already replaced several sensors with no luck. After checking the wiring and grounds, we hooked up our scope to the PCM’s 5-volt reference circuit and saw a noisy, unstable signal. That confirmed our suspicion: the internal voltage regulator in the original PCM was failing, causing all the connected sensors to send back bad data. We installed one of our VIN-programmed 12586242 modules, cleared the codes, and the truck ran perfectly. It’s a great reminder that when you see multiple, unrelated electronic faults, the central computer is often the true culprit.
Guaranteed Performance for Your 2004 Escalade EXT PCM
This module is the definitive fix for a wide range of drivability problems. By replacing your old, failing unit with this professionally programmed computer, you restore the precise calculations needed for optimal engine performance, fuel economy, and emissions control. This unit is compatible with a vast array of 2004 GM trucks and SUVs. Please verify that your original part number is 12586242 or one of the interchangeable service numbers listed, such as YFKJ, YFKD, YFKF, YFKH, YFKX, YFXL, YFXM, YFXN, YFXP, or YHTN.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes
- ✔ Vehicle fails to start or starts intermittently
- ✔ Rough idling, stalling, or hesitation during acceleration
- ✔ Poor fuel economy and decreased engine power
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ False sensor readings or multiple unrelated error codes
Ordering is simple. After you complete your purchase, please provide us with your vehicle’s 17-digit VIN. Our team will handle the programming, ensuring a seamless installation and immediate restoration of your vehicle’s performance. Get back on the road with confidence.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it to you. It will arrive ready to install, requiring no additional programming.
Where is the PCM located on my 2004 GM truck or SUV?
On most compatible models like the Escalade, Sierra, Silverado, and Tahoe, the PCM is located in the engine bay on the driver’s side, under the battery tray. On models like the Trailblazer, Envoy, and Rainier, it is typically found next to the air filter box.
How do I provide my VIN for programming?
You can add your 17-digit VIN to the notes section during checkout. If you forget, don’t worry—we will contact you via email after your purchase to request the necessary information before programming and shipping your part.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then this part will resolve the issue. It’s crucial to ensure that the PCM is the root cause of the problem and not another faulty sensor or wiring issue.
Is this compatible with other service numbers?
Yes, this PCM with service number 12586242 is a direct replacement for several other service numbers, including 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN.