Restore Peak Performance to Your 2004 GM Truck or SUV
Is your 2004 Cadillac Escalade, Sierra, Yukon, or another GM vehicle suffering from perplexing engine issues? A faulty Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit behind poor performance, erratic behavior, and frustrating check engine lights. This replacement PCM, corresponding to GM service number 12586242, is the definitive solution to restore your vehicle’s factory operation and reliability. It arrives at your door pre-programmed with the latest GM software updates, specifically flashed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures a seamless installation process and correct communication between all your vehicle’s critical systems.
From the Diagnostic Bay
We had a 2004 Sierra Denali come into the shop with a persistent misfire on cylinder 3 and terrible fuel economy. The owner had already replaced the spark plug, ignition coil, and fuel injector, but the problem remained. Diagnostic scans showed no communication with the PCM. After confirming power and ground to the module were good, we identified an internal failure. By installing a VIN-programmed PCM just like this one, we were able to resolve all the issues in one go, saving the customer from further expensive and unnecessary parts swapping. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing GM PCM
- ✔ Check Engine Light (CEL) is illuminated with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent loss of power or performance.
Direct Replacement 2004 Escalade PCM
This module is a direct-fit replacement, designed to meet or exceed original equipment specifications. It is compatible with a wide array of 2004 General Motors trucks and SUVs. To ensure perfect compatibility, simply match your existing module’s service number to one of the numbers listed below. Upon purchase, you will need to provide us with your VIN. Our technicians will then program the module, ensuring it is ready for installation right out of the box. In some cases, a CASE (Crankshaft Angle Sensor Error) relearn procedure may be required after installation, which can be performed with a compatible high-level scan tool.
Compatible Service Numbers:
This unit replaces modules with the following service numbers: 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN. It is essential to verify one of these numbers on your original computer to guarantee fitment.
Frequently Asked Questions
Do I need to have this computer programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. This service is included with your purchase. Simply provide your VIN during or after checkout.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can typically find it on a sticker on the driver’s side door jamb, on a plate on the driver’s side of the dashboard visible through the windshield, or on your vehicle’s registration and insurance documents.
Will this fix my vehicle’s specific problem?
If your vehicle’s issues have been correctly diagnosed as a faulty PCM, then this part will resolve those problems. This module will not fix issues caused by other faulty components like sensors, wiring, or mechanical failures.
Is any additional setup required after installation?
In many cases, the module is plug-and-play. However, some vehicles may require a security relearn procedure (which can often be done without special tools) and/or a CASE relearn to sync the crankshaft position sensor with the new PCM. A qualified technician with a high-level scan tool can perform a CASE relearn if needed.
Where is the PCM located on my 2004 GM truck/SUV?
The location varies slightly by model. On most trucks and large SUVs like the Escalade, Silverado, and Sierra, it is located on the driver’s side (LH) front of the engine bay, under the battery tray. On models like the Trailblazer and Envoy, it is typically located next to the air filter box.