2004 Escalade EXT PCM 12586242 Programmed Engine Computer

Restore Your GM’s Engine Performance!

Get your vehicle running right again with this pre-programmed Powertrain Control Module (PCM). We flash it to your specific VIN with the latest GM software for a guaranteed match. This is the simple, reliable fix for stalling, rough idle, and check engine light issues. Order now to get back on the road!

$119.95

+11.99 USPS Priority Shipping

Availability: In stock



Guaranteed Safe Checkout

Is Your 2004 GM Truck or SUV Running Rough?

If your 2004 Cadillac Escalade EXT, GMC Sierra, Chevy Silverado, or another compatible GM vehicle is suffering from perplexing engine issues, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer, the PCM governs everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of problems that are frustrating to diagnose and can leave your vehicle unreliable or even undriveable. This replacement PCM, part number 12586242, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.

From the Diagnostic Bay

We had a 2004 Yukon Denali come in with an issue that had stumped two other shops. The owner complained of random stalling at traffic lights and a harsh 1-2 shift that would come and go. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. After checking all the usual suspects—wiring harnesses, grounds, sensors—we focused on the PCM. On the surface, it seemed fine. But by monitoring live data streams, we noticed split-second dropouts in sensor readings just before a stall. We swapped in one of our VIN-programmed 12586242 units, performed the security relearn, and the truck ran perfectly. The internal logic board of the original PCM was failing intermittently under heat, a common issue for these modules after years of service. A pre-programmed replacement saved the customer from weeks of further guesswork and got them back on the road with confidence.

Symptoms of a Failing Powertrain Control Module

  • ✔ Check Engine Light: The most common sign, often with codes related to sensors, emissions, or internal module failure.
  • ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
  • ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing a significant drop in MPG.
  • ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in a gear (limp mode).
  • ✔ Engine Stalling: The engine may stall unexpectedly while driving or at a stop.
  • ✔ No-Start Condition: The vehicle may crank but fail to start due to lack of fuel or spark commands from the PCM.
  • ✔ Failure to Pass Emissions Test: A faulty PCM can prevent the vehicle’s readiness monitors from setting, leading to an automatic failure.

The Simple, Reliable Solution: A VIN-Programmed 2004 Escalade EXT PCM

Don’t settle for a generic, unprogrammed module from a salvage yard that could create more problems than it solves. Our process is designed to provide a seamless, effective repair. This unit, service number 12586242, is a direct replacement for a wide range of 2004 GM trucks and SUVs. We take the guesswork out of the equation. When you order, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most stable software calibration directly from GM for your specific vehicle. This ensures that the module communicates perfectly with your engine, transmission, and all other onboard systems right out of the box.

This module is a direct fit for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. After installation, the only remaining step for most vehicles is a simple security relearn procedure, which pairs the new PCM to your vehicle’s anti-theft system. This can typically be done in your own driveway without any special tools. By choosing our pre-programmed module, you are getting a reliable part that restores the original functionality and performance of your vehicle’s powertrain management system.

Frequently Asked Questions

Do I need to have this computer programmed?

No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle configuration.

What is the security relearn procedure?

The security relearn, or anti-theft relearn, is a simple procedure that syncs the new PCM with your vehicle’s existing keys and security system. It typically involves turning the ignition key to the ‘ON’ position for 10-12 minutes, then ‘OFF’ for 30 seconds, and repeating this cycle three times. Instructions are readily available online for your specific model.

Where is the PCM located on my vehicle?

On most compatible 2004 GM trucks and SUVs like the Escalade, Sierra, and Silverado, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray. On models like the Trailblazer, Envoy, and Rainier, it is typically found next to the air filter box.

Will this fix my check engine light?

If the check engine light and associated symptoms are caused by a faulty PCM, this replacement module will resolve the issue. However, it’s crucial to ensure that the root cause is not a separate faulty sensor or wiring problem. We always recommend a proper diagnosis before ordering parts.

Is this a plug-and-play part?

This is as close to plug-and-play as it gets. Because we program it to your VIN, it eliminates the need for expensive dealer programming. After the physical installation, you will only need to perform the security relearn procedure to start the vehicle.

Condition

Refurbished

Year

Genuine OEM

Yes

MPN

YHTN

Interchange part number

Model

ESCALADE EXT

Year

2004

Brand

GM

Manufacturer Part Number

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superseded part number

12586242 19299226 89017738 YFKD, YFKF YFKH YFKJ YFKX YFXL, YFXM YFXN YFXP YHTN

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